High-pressure and low-temperature structural study of claudetite I, a monoclinic layered As2O3 polymorph
Guńka, Piotr A.; Hanfland, Michael; Chen, Yu-Sheng; Zachara, Janusz; CrystEngComm 23 (2021) 638–644; doi:10.1039/D0CE01401J

data_7241826
_publ_section_title
;
 High-pressure and low-temperature structural study of claudetite I, a
 monoclinic layered As2O3 polymorph
;
_journal_issue                   3
_journal_name_full               CrystEngComm
_journal_page_first              638
_journal_page_last               644
_journal_paper_doi               10.1039/D0CE01401J
_journal_volume                  23
_journal_year                    2021
_chemical_formula_moiety         'As2 O3'
_chemical_formula_sum            'As2 O3'
_chemical_formula_weight         197.84
_chemical_name_common            'claudetite I'
_chemical_name_systematic
;
arsenic(III) oxide
;
_space_group_IT_number           14
_space_group_name_Hall           '-P 2yn'
_space_group_name_H-M_alt        'P 1 21/n 1'
_symmetry_cell_setting           monoclinic
_symmetry_space_group_name_H-M   'P 1 21/n 1'
_audit_creation_date             2020-10-21T10:46
_audit_creation_method           'created in GSAS-II'
_audit_update_record
;
2020-10-22 deposited with the CCDC.	2020-12-10 downloaded from the CCDC.
;
_cell_angle_alpha                90
_cell_angle_beta                 94.591(5)
_cell_angle_gamma                90
_cell_formula_units_Z            4
_cell_length_a                   5.1081(5)
_cell_length_b                   12.49492(17)
_cell_length_c                   4.4239(3)
_cell_measurement_pressure       3.1e6(5)
_cell_measurement_temperature    293
_cell_volume                     281.45(3)
_computing_data_reduction        Fit2D
_computing_structure_refinement
'GSAS-II (Toby & Von Dreele, J. Appl. Cryst. 46, 544-549, 2013)'
_diffrn_ambient_pressure         3.1e6(5)
_diffrn_ambient_temperature      293
_diffrn_detector                 'Mar555 flat panel'
_diffrn_detector_type            'Mar555 flat panel'
_diffrn_measurement_device_type  'ESRF ID09A beamline'
_diffrn_radiation_monochromator  Si
_diffrn_radiation_polarisn_ratio 0.9900
_diffrn_radiation_probe          x-ray
_diffrn_radiation_wavelength     0.41421
_diffrn_source                   'ESRF ID09A'
_diffrn_source_type              synchrotron
_exptl_crystal_colour            colourless
_exptl_crystal_density_diffrn    4.6690
_exptl_crystal_description       'white powder'
_pd_block_id                     2020-10-21T10:46|clau1_007rietveld||id09a
_pd_calc_method                  'Rietveld Refinement'
_pd_meas_number_of_points        4000
_pd_phase_name                   claudetiteI
_pd_prep_pressure                100.0(1)
_pd_prep_temperature             293
_pd_proc_info_datetime           2020-10-21T10:46
_pd_proc_ls_background_function
;
Background function: "chebyschev" function with 20 terms:
    708.9(14), 363(8), -498(24), -7.4(8)e2, 1.330(10)e4, 7.73(21)e3, 
    -1.1803(8)e5, -4.871(7)e4, 5.0237(9)e5, 2.0683(20)e5, -1.20054(3)e6, 
    -5.7063(9)e5, 1.70272(8)e6, 9.7236(12)e5, -1.42458(11)e6, 
    -9.7789(23)e5, 6.4967(5)e5, 5.3050(13)e5, -1.2448(14)e5, 
    -1.1952(26)e5, 
;
_pd_proc_ls_pref_orient_corr
;
Simple spherical harmonic correction Order = 6
    Coefficients:  0:0:C(6,6) = 0.321(18); 0:0:C(4,4) = 0.776(24); 
    0:0:C(6,-2) = 0.116(22); 0:0:C(2,-2) = 0.273(13); 0:0:C(4,-4) = 0.160(18); 
    0:0:C(2,2) = 0.775(14); 0:0:C(4,0) = 0.218(20); 0:0:C(6,-6) = -0.335(24); 
    0:0:C(6,4) = 0.200(23); 0:0:C(4,2) = 0.035(17); 0:0:C(6,2) = 0.094(19); 
    0:0:C(6,-4) = 0.067(20); 0:0:C(6,0) = 0.303(24); 0:0:C(2,0) = 0.815(15); 
    0:0:C(4,-2) = -0.009(15); 
;
_pd_proc_ls_profile_function
;
Finger-Cox-Jephcoat function parameters U, V, W, X, Y, SH/L:
  peak variance(Gauss) = Utan(Th)^2^+Vtan(Th)+W:
  peak HW(Lorentz) = X/cos(Th)+Ytan(Th); SH/L = S/L+H/L
  U, V, W in (centideg)^2^, X & Y in centideg
    5.9(5)e2, -97(9), 5.4(4), 0.91(10), 13.5(28), 0.002, 
  Crystallite size in microns with "isotropic" model:
  parameters: Size, G/L mix
    1.000, 1.000, 
  Microstrain, "isotropic" model (10^6^ * delta Q/Q)
    parameters: Mustrain, G/L mix
    1000.000, 1.000, 

;
_pd_proc_ls_prof_R_factor        0.01715
_pd_proc_ls_prof_wR_expected     0.03558
_pd_proc_ls_prof_wR_factor       0.02882
_refine_ls_goodness_of_fit_all   0.826
_refine_ls_matrix_type           full
_refine_ls_number_parameters     62
_refine_ls_R_Fsqd_factor         0.40688
_refine_ls_shift/su_max          0.0014
_refine_ls_wR_factor_obs         0.02896
_reflns_d_resolution_high        1.160
_reflns_d_resolution_low         6.247
_reflns_limit_h_max              4
_reflns_limit_h_min              0
_reflns_limit_k_max              10
_reflns_limit_k_min              0
_reflns_limit_l_max              3
_reflns_limit_l_min              -3
_reflns_number_total             189
_cod_data_source_file            d0ce01401j3.cif
_cod_data_source_block           clau1_007rietveld
_cod_depositor_comments
'Adding full bibliography for 7241824--7241862.cif.'
_cod_original_cell_volume        281.453(15)
_cod_database_code               7241826
_refine_ls_r_f_factor            0.07742
_gsas_proc_ls_prof_r_b_factor    0.03466
_gsas_proc_ls_prof_wr_b_factor   0.05075