# Borate phosphate

Borate phosphates are mixed anion compounds containing separate borate and phosphate anions. They are distinct from the borophosphates where the borate is linked to a phosphate via a common oxygen atom. The borate phosphates have a higher ratio of cations to number of borates and phosphates, as compared to the borophosphates.
There are also organic esters of both borate and phosphate, e.g. NADH-borate.

## Production

In the high temperature method, ingredients are heated together at atmospheric pressure. Products are anhydrous, and production or borophosphates is likely.
The boron flux method involves dissolving ingredients such as an ammonium phosphate and metal carbonate in an excess of molten boric acid.

## Use

Borate phosphates are of research interest for their optical, electrooptical or magnetic properties.

## List

| | chem | mw | crystal system | space group | unit cell Å | volume | density | comment |
| | Be$_3$(BO$_3$)(PO$_4$) | | hexagonal | | | | | SHG |
| | α-Mg$_3$[BPO$_7$] | | orthorhombic | Immm | a=8·495, b=4·886, c=12·565 Z=4 | | | |
| | Mg$_3$[BPO$_7$] | | monoclinic | Cm | | | | |
| | Mg$_3$[BPO$_7$] | | hexagonal | P6_2m | | | | |
| Lüneburgite | Mg$_3$[B$_2$(OH)$_6$](PO$_4$)$_2$ · 6H$_2$O | | triclinic | | | | 2.05 | Biaxial (-) n$_α$ = 1.520 – 1.522 n$_β$ = 1.540 – 1.541 n$_γ$ = 1.545 – 1.548 2V 52° to 60° Max birefringence δ = 0.025 – 0.026 |
| | Ca$_3$[BPO$_7$] | | monoclinic | | a=8.602 b=4.891 c=12.806 β=102.30 | | | |
| Seamanite | Mn$^{2+}$$_3$[B(OH)$_4$](PO$_4$)(OH)$_2$ | | orthorhombic | Pbnm | a = 7.81 Å, b = 15.11 Å, c = 6.69 Å Z=4 | 789.48 | 3.08 | Biaxial (+) n$_α$ = 1.640 n$_β$ = 1.663 n$_γ$ = 1.665 2V 40° Max birefringence δ = 0.025 |
| Laptevite-(Ce) | Ca$_6$(Fe$^{2+}$,Mn$^{2+}$)Y$_3$REE$_7$(SiO$_4$)$_3$(PO$_4$)(B$_3$Si$_3$O$_{18}$)(BO$_3$)F$_{11}$ | | trigonal | R3m | a = 10.804, c = 27.726 Z=3 | 2802.6 | 4.61 | Uniaxial (-) n$_ω$ = 1.741 n$_ε$ = 1.720 Max birefringence δ = 0.021 |
| | (CoPO$_4$)$_4$, B$_5$O$_6$(OH)$_4$N(CH$_3$)$_4$(CH$_3$NH$_3$) | 1036.10 | orthorhombic | I222 | a=6.7601 b=7.5422 c=34.822 Z=2 | 1775.4 | 1.938 | red |
| | Co$_3$[BPO$_7$] | | monoclinic | Cm | a=9.774, b=12.688, c=4.9057, β=119.749°; Z=4 | 528.2 | | purple |
| | α-Zn$_3$[BPO$_7$] | 349.89 | orthorhombic | | a=8.438 b=4.884 c=12.558 | | | |
| | α-Zn$_3$[BPO$_7$] | 349.89 | monoclinic | Cm | a=9.725 b=12.720 c=4.874 β=119.80 Z=4 | | | |
| | β-Zn$_3$[BPO$_7$] | 349.89 | hexagonal | P-6 | a=8.4624 c=13.0690 Z=6 | 810.51 | 4.301 | colourless |
| | α-Sr$_3$[BPO$_7$] | | orthorhombic | | a=9.0561, b=9.7984, c=13.9531 | | | |
| | Sr$_{10}$[(PO$_4$)$_{5.5}$(BO$_4$)$_{0.5}$](BO$_2$) | | | P3_ | a=9.7973, c=7.3056, Z=1 | 607.29 | | |
| | SrCo$_2$(BO$_3$)(PO$_4$) | 359.26 | monoclinic | P2$_1$/c | a=6.485 b=9.270 c=10.066 β=111.14 Z=4 | 548.7 | 4.349 | red |
| Byzantievite | Ba$_5$(Ca,REE,Y)$_{22}$(Ti,Nb)$_{18}$(SiO$_4$)$_4$[(PO$_4$, SiO$_4$)]$_4$(BO$_3$)$_9$O$_{22}$[(OH),F]$_{43}$(H$_2$O)$_{1.5}$ | | trigonal | R3 | a = 9.1202, c = 102.145 | 7,357.9 | 4.10 | Uniaxial (-) n$_ω$ = 1.940 n$_ε$ = 1.860 Max birefringence δ = 0.080 16 different layers in structure |
| Rhabdoborite | Mg$_{12}$(V$^{5+}$,Mo$^{6+}$,W$^{6+}$)$_1$ · $_5$O$_6${[BO$_3$]$^{6-}$x[(P,As)O$_4$]xF$^{2-}$x} (x < $_1$) | | hexagonal | P6$_3$ | a = 10.6314, c = 4.5661 | 446.95 | | |
| | CsNa$_2$Y$_2$(BO$_3$)(PO$_4$)$_2$ | 605.46 | orthorhombic | Cmcm | a=6.9491 b=14.907 c=10.6201 Z=4 | 1100.2 | 3.655 | colourless |
| | CsZn$_4$(BO$_3$)(PO$_4$)$_2$ | 679.30 | orthorhombic | Pbca | a=14.49 b=10.02 c=16.45 Z=8 | 2388 | 3.779 | colourless |
| | Ba$_3$(BO$_3$)(PO$_4$) | | hexagonal | P6$_3$mc | a=5.4898, c=14.7551, Z=2 | | | |
| | Ba$_3$(BO$_3$)(PO$_4$) | | monoclinic | P2/m | a = 11.7947, b = 9.6135, c = 12.9548, β= 111.25° | 1369.08 | | |
| | Ba$_{11}$B$_{26}$O$_{44}$(PO$_4$)$_2$(OH)$_6$ | | monoclinic | P2$_1$/c | a=6.891, b=13.629, c=25.851, β=90.04° | | | |
| | Ba$_3$(ZnB$_5$O$_{10}$)PO$_4$ | 786.41 | orthorhombic | Pnm2$_1$ | a = 10.399 b = 7.064 c = 8.204 Z=2 | 602.6 | 4.334 | |
| | La$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | | a=7.019 b=17.915 c=12.653 β=97.52 | 1577.27 | | |
| | Pr$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | P12$_1$/n1 | a=6.8939 b=17.662 c=12.442 β=97.24 Z=4 | 1502.9 | | green |
| | Nd$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | | a=6.862 b=17.591 c=12.375 β=97.18 | 1482.12 | | |
| | Sm$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | P12$_1$/n1 | a=6.778 b=17.396 c=12.218 β=96.96 Z=4 | 1430.0 | | yellow |
| | CsNa$_2$Sm$_2$(BO$_3$)(PO$_4$)$_2$ | 728.34 | orthorhombic | Cmcm | a=7.0631 b=15.288 c=10.725 Z=4 | 1158.1 | 4.177 | colourless |
| | CsNa$_2$Ho$_2$(BO$_3$)(PO$_4$)$_2$ | | | | | | | |
| | CsNa$_2$Er$_2$(BO$_3$)(PO$_4$)$_2$ | | | | | | | |
| | CsNa$_2$Tm$_2$(BO$_3$)(PO$_4$)$_2$ | | | | | | | |
| | Gd$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | | a=6.704 b=17.299 c=12.100 β=96.94 | 1393.11 | | |
| | Dy$_7$O$_6$(BO$_3$)(PO$_4$)$_2$ | | monoclinic | | a=6.623 b=17.172 c=11.960 β=96.76 | 1350.84 | | |
| | K$_3$Yb[OB(OH)$_2$]$_2$[HOPO$_3$]$_2$ | | | R3_ | a=5.6809, c=36.594 Z=3 | 1022.8 | | |
| | CsNa$_2$Yb$_2$(BO$_3$)(PO$_4$)$_2$ | | | | | | | |
| | K$_3$Lu[OB(OH)$_2$]$_2$[HOPO$_3$]$_2$ | | | R3_ | a=5.6668, c=36.692 Z=3 | 1020.4 | | |
| | CsNa$_2$Lu$_2$(BO$_3$)(PO$_4$)$_2$ | 777.58 | orthorhombic | Cmcm | a = 6.8750 b = 14.6919 c = 10.5581 | 1066.44 | 4.843 | |
| | Pb$_4$O(BO$_3$)(PO$_4$) | 998.54 | monoclinic | P2$_1$/c | a=10.202 b=7.005 c=12.92 β=113.057 Z=4 | 849.6 | 7.807 | colourless |
| | LiPb$_4$(BO$_3$)(PO$_4$)$_2$ | 1084.85 | orthorhombic | Pbca | a=12.613 b=6.551 c=25.63 Z=8 | 2095 | 6.875 | colourless |
| | Bi$_4$O$_3$(BO$_3$)(PO$_4$) | 1037.70 | orthorhombic | Pbca | a=5.536 b=14.10 c=22.62 Z=8 | 1766 | 7.807 | colourless |
| | Th$_2$[BO$_4$][PO$_4$] | | monoclinic | P2$_1$/c | a=8.4665, b=7.9552, c=8.2297, β= 103.746° Z = 4 | | | |
| | Ba$_5$[(UO$_2$)(PO$_4$)$_3$(B$_5$O$_9$)]·nH$_2$O | | | | | | | interlocking nanotubes; absorbs water from air |
| | U$_2$[BO$_4$][PO$_4$] | 645.84 | monoclinic | P2$_1$/c | a = 8.546, b = 7.753, c = 8.163 β = 102.52° Z=4 | 528.0 | 8.12 | generated at 12.5 GPa + 1000 °C; emerald green |
| | [Sr$_8$(PO$_4$)$_2$][(UO$_2$)(PO$_4$)$_2$(B$_5$O$_9$)$_2$] | 1746.97 | monoclinic | P2$_1$/n | a = 6.5014, b =22.4302, c =9.7964 β = 90.241° Z=2 | 1428.57 | 4.061 | orange |