A new high-pressure polymorph of phosphoric acid
Bull, Craig L.; Funnell, Nicholas P.; Pulham, Colin R.; Marshall, William G.; Allan, David R.; Acta Crystallographica Section B 73 (2017) 1068–1074; doi:10.1107/S205252061701441X

data_2108158
_publ_section_title
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 A new high-pressure polymorph of phosphoric acid
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_journal_coeditor_code           XK5045SUP1
_journal_issue                   6
_journal_name_full               'Acta Crystallographica Section B'
_journal_page_first              1068
_journal_page_last               1074
_journal_paper_doi               10.1107/S205252061701441X
_journal_volume                  73
_journal_year                    2017
_chemical_compound_source        'Sigma Aldrich'
_chemical_formula_moiety         'H3 O4 P'
_chemical_formula_sum            'H3 O4 P'
_chemical_formula_weight         97.994
_chemical_melting_point          315.5
_chemical_name_common            'Phosphoric acid'
_chemical_name_systematic
;
Phosphoric acid
;
_space_group_IT_number           14
_symmetry_cell_setting           monoclinic
_symmetry_Int_Tables_number      14
_symmetry_space_group_name_Hall  '-P 2ybc'
_symmetry_space_group_name_H-M   'P 1 21/c 1'
_atom_sites_solution_hydrogens   geom
_atom_sites_solution_primary     direct
_atom_sites_solution_secondary   difmap
_audit_creation_method           SHELXL-97
_cell_angle_alpha                90.00
_cell_angle_beta                 94.75(5)
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
_cell_length_a                   5.707(2)
_cell_length_b                   4.820(2)
_cell_length_c                   11.436(2)
_cell_measurement_pressure       0.5
_cell_measurement_reflns_used    24
_cell_measurement_temperature    293(2)
_cell_measurement_theta_max      15.31
_cell_measurement_theta_min      3.58
_cell_volume                     313.50(18)
_computing_structure_refinement  'SHELXL-97 (Sheldrick, 1997)'
_diffrn_ambient_temperature      293(2)
_diffrn_measured_fraction_theta_full 0.197
_diffrn_measured_fraction_theta_max 0.197
_diffrn_measurement_device_type  'Nonius CAD4'
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
_diffrn_radiation_wavelength     0.71073
_diffrn_reflns_av_R_equivalents  0.0858
_diffrn_reflns_av_sigmaI/netI    0.0604
_diffrn_reflns_limit_h_max       3
_diffrn_reflns_limit_h_min       -3
_diffrn_reflns_limit_k_max       8
_diffrn_reflns_limit_k_min       -8
_diffrn_reflns_limit_l_max       15
_diffrn_reflns_limit_l_min       -15
_diffrn_reflns_number            1255
_diffrn_reflns_theta_full        39.07
_diffrn_reflns_theta_max         39.07
_diffrn_reflns_theta_min         3.58
_exptl_absorpt_coefficient_mu    0.692
_exptl_absorpt_correction_T_max  1.000
_exptl_absorpt_correction_T_min  0.247
_exptl_absorpt_correction_type   analytical
_exptl_absorpt_process_details
;
Diamond anvil cell absorption correction:
Absorb 6.0, R. J. Angel, J. Appl. Cryst., 2004, 37, 486-492
;
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    2.076
_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       block
_exptl_crystal_F_000             200
_exptl_crystal_size_max          0.2
_exptl_crystal_size_mid          0.175
_exptl_crystal_size_min          0.075
_refine_diff_density_max         0.454
_refine_diff_density_min         -0.532
_refine_diff_density_rms         0.153
_refine_ls_extinction_coef       0.11(5)
_refine_ls_extinction_expression Fc^*^=kFc[1+0.001xFc^2^\l^3^/sin(2\q)]^-1/4^
_refine_ls_extinction_method     SHELXL
_refine_ls_goodness_of_fit_ref   0.982
_refine_ls_hydrogen_treatment    mixed
_refine_ls_matrix_type           full
_refine_ls_number_parameters     22
_refine_ls_number_reflns         360
_refine_ls_number_restraints     0
_refine_ls_restrained_S_all      0.982
_refine_ls_R_factor_all          0.0989
_refine_ls_R_factor_gt           0.0720
_refine_ls_shift/su_max          0.000
_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
_refine_ls_weighting_details
'calc w=1/[\s^2^(Fo^2^)+(0.1304P)^2^+1.4756P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
_refine_ls_wR_factor_gt          0.1860
_refine_ls_wR_factor_ref         0.2169
_reflns_number_gt                294
_reflns_number_total             360
_reflns_threshold_expression     >2sigma(I)
_cod_data_source_file            xk5045sup1.cif
_cod_data_source_block           Phosphoric_acid_I_0.5_GPa_S_xtal
_cod_depositor_comments
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The following automatic conversions were performed:

'_chemical_melting_point' value '315.5 K' was changed to '315.5' -
the value should be numeric and without a unit designator.

'_symmetry_cell_setting' value 'Monoclinic' changed to 'monoclinic'
according to
/home/data/users/saulius/crontab/automatic-downloads/rss-feeds/IUCr/lib/dictionaries/cif_core.dic
dictionary named 'cif_core.dic' version 2.4.2 from 2011-04-26.

Automatic conversion script
Id: cif_fix_values 4973 2017-02-22 13:04:09Z antanas 
;
_cod_original_cell_volume        313.49(18)
_cod_original_sg_symbol_H-M      'P 21/c'
_cod_database_code               2108158