cometadata/datacite-titles-descriptions-related-identifiers huggingface dataset:
DOI: 10.17188/1742581
title: Materials Data on CS by Materials Project

description: SC1 is lead oxide structured and crystallizes in the tetragonal P4/nmm space group. The structure is two-dimensional and consists of one SC1 sheet oriented in the (0, 0, 1) direction. C2+ is bonded to four equivalent S2- atoms to form a mixture of distorted edge and corner-sharing CS4 trigonal pyramids. All C–S bond lengths are 1.90 Å. S2- is bonded in a distorted see-saw-like geometry to four equivalent C2+ atoms.
DOI: 10.17188/1742582
title: Materials Data on Ho5BiPd2 by Materials Project

description: Ho5Pd2Bi crystallizes in the tetragonal I4/mcm space group. The structure is three-dimensional. there are two inequivalent Ho sites. In the first Ho site, Ho is bonded to four equivalent Pd and two equivalent Bi atoms to form distorted HoBi2Pd4 octahedra that share corners with six equivalent HoBi2Pd4 octahedra, corners with sixteen equivalent HoBi2Pd3 trigonal bipyramids, and faces with eight equivalent HoBi2Pd3 trigonal bipyramids. The corner-sharing octahedra tilt angles range from 0–49°. All Ho–Pd bond lengths are 3.03 Å. Both Ho–Bi bond lengths are 3.45 Å. In the second Ho site, Ho is bonded to three equivalent Pd and two equivalent Bi atoms to form distorted HoBi2Pd3 trigonal bipyramids that share corners with four equivalent HoBi2Pd4 octahedra, corners with twelve equivalent HoBi2Pd3 trigonal bipyramids, edges with seven equivalent HoBi2Pd3 trigonal bipyramids, faces with two equivalent HoBi2Pd4 octahedra, and a faceface with one HoBi2Pd3 trigonal bipyramid. The corner-sharing octahedra tilt angles range from 43–63°. All Ho–Pd bond lengths are 2.99 Å. Both Ho–Bi bond lengths are 3.31 Å. Pd is bonded in a 8-coordinate geometry to eight Ho atoms. Bi is bonded in a distorted q6 geometry to ten Ho atoms.
DOI: 10.17188/1742583
title: Materials Data on VPS3 by Materials Project

description: PVS3 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one PVS3 sheet oriented in the (0, 0, 1) direction. V3+ is bonded to six S2- atoms to form edge-sharing VS6 octahedra. There are a spread of V–S bond distances ranging from 2.49–2.51 Å. P3+ is bonded in a trigonal non-coplanar geometry to three S2- atoms. There are one shorter (2.07 Å) and two longer (2.08 Å) P–S bond lengths. There are two inequivalent S2- sites. In the first S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent V3+ and one P3+ atom. In the second S2- site, S2- is bonded in a distorted trigonal non-coplanar geometry to two equivalent V3+ and one P3+ atom.
DOI: 10.17188/1742584
title: Materials Data on Li2MnFe(BO3)2 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742585
title: Materials Data on CaFe4(CuO4)3 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742586
title: Materials Data on V3(O2F)2 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742587
title: Materials Data on Li7Mn5O12 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742588
title: Materials Data on Fe2PCO7 by Materials Project

description: Fe2CPO7 crystallizes in the monoclinic P2_1/c space group. The structure is three-dimensional. there are two inequivalent Fe+2.50+ sites. In the first Fe+2.50+ site, Fe+2.50+ is bonded to six O2- atoms to form FeO6 octahedra that share corners with four equivalent PO4 tetrahedra and edges with three FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.82–2.17 Å. In the second Fe+2.50+ site, Fe+2.50+ is bonded to six O2- atoms to form distorted FeO6 octahedra that share corners with three equivalent PO4 tetrahedra and edges with two equivalent FeO6 octahedra. There are a spread of Fe–O bond distances ranging from 1.89–2.12 Å. C4+ is bonded in a bent 120 degrees geometry to two O2- atoms. There is one shorter (1.25 Å) and one longer (1.28 Å) C–O bond length. P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with seven FeO6 octahedra. The corner-sharing octahedra tilt angles range from 38–57°. There are a spread of P–O bond distances ranging from 1.52–1.58 Å. There are seven inequivalent O2- sites. In the first O2- site, O2- is bonded in a water-like geometry to two Fe+2.50+ atoms. In the second O2- site, O2- is bonded in a 3-coordinate geometry to two Fe+2.50+ and one P5+ atom. In the third O2- site, O2- is bonded in a distorted trigonal planar geometry to two equivalent Fe+2.50+ and one P5+ atom. In the fourth O2- site, O2- is bonded in a 2-coordinate geometry to one Fe+2.50+ and one P5+ atom. In the fifth O2- site, O2- is bonded in a 3-coordinate geometry to two Fe+2.50+ and one P5+ atom. In the sixth O2- site, O2- is bonded in a 3-coordinate geometry to two Fe+2.50+ and one C4+ atom. In the seventh O2- site, O2- is bonded in a bent 120 degrees geometry to one Fe+2.50+ and one C4+ atom.
DOI: 10.17188/1742589
title: Materials Data on Co(Bi3O5)4 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742590
title: Materials Data on MgSi by Materials Project

description: MgSi is Tetraauricupride structured and crystallizes in the tetragonal P4/mmm space group. The structure is three-dimensional. Mg is bonded to four equivalent Mg and eight equivalent Si atoms to form a mixture of distorted corner, edge, and face-sharing MgMg4Si8 cuboctahedra. All Mg–Mg bond lengths are 2.91 Å. All Mg–Si bond lengths are 2.90 Å. Si is bonded in a 12-coordinate geometry to eight equivalent Mg atoms.
DOI: 10.17188/1742591
title: Materials Data on Ti3CrSn2(PO4)6 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742592
title: Materials Data on MgCrP2O7 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742593
title: Materials Data on Li4TiCrO6 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742594
title: Materials Data on Al2O3 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742595
title: Materials Data on TlAgTeO3 by Materials Project

description: AgTlTeO3 crystallizes in the orthorhombic Iba2 space group. The structure is three-dimensional. Ag1+ is bonded in a 6-coordinate geometry to six O2- atoms. There are a spread of Ag–O bond distances ranging from 2.35–3.10 Å. Tl1+ is bonded in a 5-coordinate geometry to five O2- atoms. There are a spread of Tl–O bond distances ranging from 2.62–3.16 Å. Te4+ is bonded in a 3-coordinate geometry to three O2- atoms. There is one shorter (1.90 Å) and two longer (1.91 Å) Te–O bond length. There are three inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted trigonal non-coplanar geometry to one Ag1+, one Tl1+, and one Te4+ atom. In the second O2- site, O2- is bonded in a 1-coordinate geometry to four equivalent Ag1+, one Tl1+, and one Te4+ atom. In the third O2- site, O2- is bonded in a 5-coordinate geometry to one Ag1+, three equivalent Tl1+, and one Te4+ atom.
DOI: 10.17188/1742597
title: Materials Data on SrAs2(XeF6)3 by Materials Project

description: SrAs2(XeF6)3 crystallizes in the monoclinic C2/m space group. The structure is two-dimensional and consists of one SrAs2(XeF6)3 sheet oriented in the (0, 0, 1) direction. there are three inequivalent Xe sites. In the first Xe site, Xe is bonded in a linear geometry to two F atoms. There are one shorter (2.07 Å) and one longer (2.09 Å) Xe–F bond lengths. In the second Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.08 Å. In the third Xe site, Xe is bonded in a linear geometry to two equivalent F atoms. Both Xe–F bond lengths are 2.07 Å. Sr is bonded in a 9-coordinate geometry to nine F atoms. There are a spread of Sr–F bond distances ranging from 2.53–2.78 Å. There are two inequivalent As sites. In the first As site, As is bonded in an octahedral geometry to six F atoms. There are a spread of As–F bond distances ranging from 1.76–1.83 Å. In the second As site, As is bonded in an octahedral geometry to six F atoms. There are a spread of As–F bond distances ranging from 1.76–1.81 Å. There are twelve inequivalent F sites. In the first F site, F is bonded in a distorted single-bond geometry to one Sr and one As atom. In the second F site, F is bonded in a single-bond geometry to one As atom. In the third F site, F is bonded in a single-bond geometry to one As atom. In the fourth F site, F is bonded in a single-bond geometry to one As atom. In the fifth F site, F is bonded in a single-bond geometry to one As atom. In the sixth F site, F is bonded in a single-bond geometry to one As atom. In the seventh F site, F is bonded in a bent 150 degrees geometry to one Xe and one Sr atom. In the eighth F site, F is bonded in a bent 150 degrees geometry to one Xe and one Sr atom. In the ninth F site, F is bonded in a single-bond geometry to one As atom. In the tenth F site, F is bonded in a distorted bent 120 degrees geometry to one Sr and one As atom. In the eleventh F site, F is bonded in a bent 150 degrees geometry to one Xe and one Sr atom. In the twelfth F site, F is bonded in a bent 150 degrees geometry to one Xe and one Sr atom.
DOI: 10.17188/1742598
title: Materials Data on Cs6OsN4 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742599
title: Materials Data on Eu2DyTaO6 by Materials Project

description: DyEu2TaO6 is (Cubic) Perovskite-derived structured and crystallizes in the cubic Fm-3m space group. The structure is three-dimensional. Dy3+ is bonded to six equivalent O2- atoms to form DyO6 octahedra that share corners with six equivalent TaO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Dy–O bond lengths are 2.21 Å. Eu2+ is bonded to twelve equivalent O2- atoms to form EuO12 cuboctahedra that share corners with twelve equivalent EuO12 cuboctahedra, faces with six equivalent EuO12 cuboctahedra, faces with four equivalent DyO6 octahedra, and faces with four equivalent TaO6 octahedra. All Eu–O bond lengths are 2.97 Å. Ta5+ is bonded to six equivalent O2- atoms to form TaO6 octahedra that share corners with six equivalent DyO6 octahedra and faces with eight equivalent EuO12 cuboctahedra. The corner-sharing octahedral tilt angles are 0°. All Ta–O bond lengths are 1.99 Å. O2- is bonded in a distorted linear geometry to one Dy3+, four equivalent Eu2+, and one Ta5+ atom.
DOI: 10.17188/1742600
title: Materials Data on CaZrN2 by Materials Project

description: CaZrN2 is Caswellsilverite structured and crystallizes in the trigonal R-3m space group. The structure is three-dimensional. Ca2+ is bonded to six equivalent N3- atoms to form CaN6 octahedra that share corners with six equivalent ZrN6 octahedra, edges with six equivalent CaN6 octahedra, and edges with six equivalent ZrN6 octahedra. The corner-sharing octahedral tilt angles are 7°. All Ca–N bond lengths are 2.50 Å. Zr4+ is bonded to six equivalent N3- atoms to form ZrN6 octahedra that share corners with six equivalent CaN6 octahedra, edges with six equivalent CaN6 octahedra, and edges with six equivalent ZrN6 octahedra. The corner-sharing octahedral tilt angles are 7°. All Zr–N bond lengths are 2.28 Å. N3- is bonded to three equivalent Ca2+ and three equivalent Zr4+ atoms to form a mixture of edge and corner-sharing NCa3Zr3 octahedra. The corner-sharing octahedral tilt angles are 0°.
DOI: 10.17188/1742601
title: Materials Data on LiCr(GeO3)2 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742602
title: Materials Data on V2F9 by Materials Project

description: V2F9 crystallizes in the trigonal P3 space group. The structure is zero-dimensional and consists of two V2F9 clusters. there are two inequivalent V+4.50+ sites. In the first V+4.50+ site, V+4.50+ is bonded to six F1- atoms to form distorted face-sharing VF6 octahedra. There is three shorter (1.75 Å) and three longer (2.01 Å) V–F bond length. In the second V+4.50+ site, V+4.50+ is bonded to six F1- atoms to form distorted face-sharing VF6 octahedra. There is three shorter (1.75 Å) and three longer (2.00 Å) V–F bond length. There are three inequivalent F1- sites. In the first F1- site, F1- is bonded in a single-bond geometry to one V+4.50+ atom. In the second F1- site, F1- is bonded in an L-shaped geometry to two V+4.50+ atoms. In the third F1- site, F1- is bonded in a single-bond geometry to one V+4.50+ atom.
DOI: 10.17188/1742604
title: Materials Data on NdScSi by Materials Project

description: NdScSi crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Nd2+ is bonded to five equivalent Si4- atoms to form a mixture of distorted edge and corner-sharing NdSi5 trigonal bipyramids. There are four shorter (3.16 Å) and one longer (3.20 Å) Nd–Si bond lengths. Sc2+ is bonded in a square co-planar geometry to four equivalent Si4- atoms. All Sc–Si bond lengths are 2.88 Å. Si4- is bonded in a 9-coordinate geometry to five equivalent Nd2+ and four equivalent Sc2+ atoms.
DOI: 10.17188/1742606
title: Materials Data on Li3V4O8 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742607
title: Materials Data on Er3Pt4 by Materials Project

description: Er3Pt4 crystallizes in the trigonal R-3 space group. The structure is three-dimensional. Er is bonded in a 9-coordinate geometry to nine Pt atoms. There are a spread of Er–Pt bond distances ranging from 2.85–3.26 Å. There are three inequivalent Pt sites. In the first Pt site, Pt is bonded in a 6-coordinate geometry to six equivalent Er atoms. In the second Pt site, Pt is bonded in a distorted octahedral geometry to six equivalent Er atoms. In the third Pt site, Pt is bonded in a 10-coordinate geometry to seven equivalent Er and three equivalent Pt atoms. There are one shorter (2.86 Å) and two longer (2.96 Å) Pt–Pt bond lengths.
DOI: 10.17188/1742608
title: Materials Data on Li2Ni3SnO8 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742609
title: Materials Data on AgGe3 by Materials Project

description: AgGe3 is beta Cu3Ti-like structured and crystallizes in the tetragonal I4/mmm space group. The structure is three-dimensional. Ag is bonded to twelve Ge atoms to form AgGe12 cuboctahedra that share corners with four equivalent AgGe12 cuboctahedra, corners with eight equivalent GeAg4Ge8 cuboctahedra, edges with eight equivalent AgGe12 cuboctahedra, edges with sixteen equivalent GeAg4Ge8 cuboctahedra, faces with four equivalent AgGe12 cuboctahedra, and faces with fourteen GeAg4Ge8 cuboctahedra. There are four shorter (2.97 Å) and eight longer (3.07 Å) Ag–Ge bond lengths. There are two inequivalent Ge sites. In the first Ge site, Ge is bonded to four equivalent Ag and eight Ge atoms to form GeAg4Ge8 cuboctahedra that share corners with twelve equivalent GeAg4Ge8 cuboctahedra, edges with eight equivalent AgGe12 cuboctahedra, edges with sixteen GeAg4Ge8 cuboctahedra, faces with four equivalent AgGe12 cuboctahedra, and faces with fourteen GeAg4Ge8 cuboctahedra. There are four shorter (2.97 Å) and four longer (3.07 Å) Ge–Ge bond lengths. In the second Ge site, Ge is bonded to four equivalent Ag and eight equivalent Ge atoms to form distorted GeAg4Ge8 cuboctahedra that share corners with four equivalent GeAg4Ge8 cuboctahedra, corners with eight equivalent AgGe12 cuboctahedra, edges with twenty-four GeAg4Ge8 cuboctahedra, faces with six equivalent AgGe12 cuboctahedra, and faces with twelve GeAg4Ge8 cuboctahedra.
DOI: 10.17188/1742610
title: Materials Data on Cu3B5Pt9 by Materials Project

description: Pt9Cu3B5 crystallizes in the hexagonal P-62m space group. The structure is three-dimensional. there are two inequivalent Pt2- sites. In the first Pt2- site, Pt2- is bonded in a 7-coordinate geometry to four equivalent Cu1+ and three B3+ atoms. There are two shorter (2.69 Å) and two longer (2.83 Å) Pt–Cu bond lengths. There are one shorter (2.21 Å) and two longer (2.23 Å) Pt–B bond lengths. In the second Pt2- site, Pt2- is bonded in a 5-coordinate geometry to one Cu1+ and four equivalent B3+ atoms. The Pt–Cu bond length is 2.56 Å. All Pt–B bond lengths are 2.24 Å. Cu1+ is bonded in a 9-coordinate geometry to nine Pt2- atoms. There are two inequivalent B3+ sites. In the first B3+ site, B3+ is bonded to six Pt2- atoms to form a mixture of distorted corner and edge-sharing BPt6 pentagonal pyramids. In the second B3+ site, B3+ is bonded to six equivalent Pt2- atoms to form a mixture of distorted corner and face-sharing BPt6 pentagonal pyramids.
DOI: 10.17188/1742611
title: Materials Data on HfCu(O2F3)2 by Materials Project

description: HfCu(O2F3)2 crystallizes in the monoclinic P2_1/c space group. The structure is one-dimensional and consists of two HfCu(O2F3)2 ribbons oriented in the (1, 0, 1) direction. Hf is bonded to six F atoms to form HfF6 octahedra that share corners with two equivalent CuO4F2 octahedra. The corner-sharing octahedral tilt angles are 19°. There are a spread of Hf–F bond distances ranging from 1.98–2.03 Å. Cu is bonded to four O and two equivalent F atoms to form CuO4F2 octahedra that share corners with two equivalent HfF6 octahedra. The corner-sharing octahedral tilt angles are 19°. All Cu–O bond lengths are 1.79 Å. Both Cu–F bond lengths are 2.35 Å. There are two inequivalent O sites. In the first O site, O is bonded in a single-bond geometry to one Cu atom. In the second O site, O is bonded in a single-bond geometry to one Cu atom. There are three inequivalent F sites. In the first F site, F is bonded in a single-bond geometry to one Hf atom. In the second F site, F is bonded in a single-bond geometry to one Hf atom. In the third F site, F is bonded in a distorted bent 150 degrees geometry to one Hf and one Cu atom.
DOI: 10.17188/1742612
title: Materials Data on Li2MnSiO4 by Materials Project

description: Computed materials data using density functional theory calculations. These calculations determine the electronic structure of bulk materials by solving approximations to the Schrodinger equation. For more information, see https://materialsproject.org/docs/calculations
DOI: 10.17188/1742613
title: Materials Data on LiCu2PO4 by Materials Project

description: LiCu2PO4 crystallizes in the monoclinic Pm space group. The structure is three-dimensional. Li1+ is bonded to four O2- atoms to form LiO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with four CuO4 tetrahedra, corners with four PO4 tetrahedra, and corners with two equivalent CuO4 trigonal pyramids. There are a spread of Li–O bond distances ranging from 2.01–2.04 Å. There are three inequivalent Cu1+ sites. In the first Cu1+ site, Cu1+ is bonded to four O2- atoms to form distorted CuO4 tetrahedra that share corners with four equivalent LiO4 tetrahedra, corners with four equivalent CuO4 tetrahedra, and corners with four PO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 1.99–2.36 Å. In the second Cu1+ site, Cu1+ is bonded to four O2- atoms to form CuO4 tetrahedra that share corners with two equivalent LiO4 tetrahedra, corners with four CuO4 tetrahedra, corners with four PO4 tetrahedra, and corners with two equivalent CuO4 trigonal pyramids. There are a spread of Cu–O bond distances ranging from 2.04–2.15 Å. In the third Cu1+ site, Cu1+ is bonded to four O2- atoms to form CuO4 trigonal pyramids that share corners with four equivalent LiO4 tetrahedra, corners with four equivalent CuO4 tetrahedra, and corners with four PO4 tetrahedra. There are a spread of Cu–O bond distances ranging from 2.07–2.26 Å. There are two inequivalent P5+ sites. In the first P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent LiO4 tetrahedra, corners with six CuO4 tetrahedra, and corners with two equivalent CuO4 trigonal pyramids. There are a spread of P–O bond distances ranging from 1.55–1.58 Å. In the second P5+ site, P5+ is bonded to four O2- atoms to form PO4 tetrahedra that share corners with four equivalent LiO4 tetrahedra, corners with six CuO4 tetrahedra, and corners with two equivalent CuO4 trigonal pyramids. There are a spread of P–O bond distances ranging from 1.55–1.57 Å. There are six inequivalent O2- sites. In the first O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to three Cu1+ and one P5+ atom. In the second O2- site, O2- is bonded in a 4-coordinate geometry to two equivalent Li1+, one Cu1+, and one P5+ atom. In the third O2- site, O2- is bonded to one Li1+, two Cu1+, and one P5+ atom to form distorted OLiCu2P tetrahedra that share corners with two equivalent OLiCu2P tetrahedra and corners with two equivalent OLi2CuP trigonal pyramids. In the fourth O2- site, O2- is bonded in a distorted rectangular see-saw-like geometry to one Li1+, two Cu1+, and one P5+ atom. In the fifth O2- site, O2- is bonded in a 4-coordinate geometry to three Cu1+ and one P5+ atom. In the sixth O2- site, O2- is bonded to two equivalent Li1+, one Cu1+, and one P5+ atom to form distorted corner-sharing OLi2CuP trigonal pyramids.