Phase Transition and Negative Thermal Expansion in Guanidinium Magnesium-Hypophosphite Hybrid Perovskite
Gao, Hong-Qiang; Wei, Wen-Juan; Tan, Yu-Hui; Tang, Yun-Zhi; Chemistry of Materials  (2020) –; doi:10.1021/acs.chemmater.0c01654

data_4003645
_publ_section_title
;
 Phase Transition and Negative Thermal Expansion in Guanidinium
 Magnesium-Hypophosphite Hybrid Perovskite
;
_journal_name_full               'Chemistry of Materials'
_journal_paper_doi               10.1021/acs.chemmater.0c01654
_journal_year                    2020
_chemical_formula_moiety         '0.11(H24 Mg4 O24 P12), 0.44(C H6 N3)'
_chemical_formula_sum            'C2 H24 Mg2 N6 O12 P6'
_chemical_formula_weight         558.71
_space_group_crystal_system      triclinic
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_space_group_name_H-M_alt        'P -1'
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_cell_angle_alpha                105.5831(8)
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_cell_angle_gamma                118.5074(10)
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_cell_length_b                   9.07444(7)
_cell_length_c                   15.61097(16)
_cell_measurement_reflns_used    9385
_cell_measurement_temperature    290(2)
_cell_measurement_theta_max      73.5970
_cell_measurement_theta_min      5.6720
_cell_volume                     1061.45(2)
_computing_cell_refinement       'CrysAlisPro 1.171.39.28b (Rigaku OD, 2015)'
_computing_data_collection       'CrysAlisPro 1.171.39.28b (Rigaku OD, 2015)'
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_computing_publication_material  'Olex2 (Dolomanov et al., 2009)'
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_diffrn_ambient_temperature      290(2)
_diffrn_measured_fraction_theta_full 0.993
_diffrn_measured_fraction_theta_max 0.960
_diffrn_measurement_device_type  'XtaLAB AFC12 (RINC): Kappa single'
_diffrn_measurement_method       '\w scans'
_diffrn_radiation_type           CuK\a
_diffrn_radiation_wavelength     1.54184
_diffrn_reflns_av_R_equivalents  0.0232
_diffrn_reflns_av_unetI/netI     0.0222
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_diffrn_reflns_limit_k_min       -11
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_diffrn_reflns_limit_l_min       -19
_diffrn_reflns_number            10572
_diffrn_reflns_point_group_measured_fraction_full 0.993
_diffrn_reflns_point_group_measured_fraction_max 0.960
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_diffrn_reflns_theta_min         5.665
_diffrn_source                   'fine-focus sealed X-ray tube'
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_exptl_absorpt_correction_T_max  1.00000
_exptl_absorpt_correction_T_min  0.46227
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_exptl_absorpt_process_details
;
CrysAlisPro 1.171.39.28b (Rigaku Oxford Diffraction, 2015)
Empirical absorption correction using spherical harmonics,
 implemented in SCALE3 ABSPACK scaling algorithm.
;
_exptl_crystal_density_diffrn    1.748
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_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     'SHELXL-2014/7 (Sheldrick 2014'
_refine_ls_goodness_of_fit_ref   1.083
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
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_refine_ls_number_reflns         4146
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      1.083
_refine_ls_R_factor_all          0.0379
_refine_ls_R_factor_gt           0.0376
_refine_ls_shift/su_max          0.001
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'w=1/[\s^2^(Fo^2^)+(0.0511P)^2^+1.4475P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.0977
_refine_ls_wR_factor_ref         0.0979
_reflns_Friedel_coverage         0.000
_reflns_number_gt                4129
_reflns_number_total             4146
_reflns_threshold_expression     'I > 2\s(I)'
_cod_data_source_file            exp_38_01_290_00.cif
_cod_data_source_block           exp_38_01_290_00
_cod_database_code               4003645
_shelx_shelxl_version_number     2014/7
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_shelx_hkl_checksum              16862