La variété β-NaMoO~2~(AsO~4~)
Ben Hlila, Soumaya; Zid, Mohamed Faouzi; Driss, Ahmed; Acta Crystallographica Section E 65 (2009) i11–; doi:10.1107/S1600536809002517

data_2220943
_publ_section_title
;
 La vari\'et\'e \b-NaMoO~2~(AsO~4~)
;
_journal_coeditor_code           WM2218
_journal_issue                   2
_journal_name_full               'Acta Crystallographica Section E'
_journal_page_first              i11
_journal_paper_doi               10.1107/S1600536809002517
_journal_volume                  65
_journal_year                    2009
_chemical_formula_iupac          'Na Mo O2 (As O4)'
_chemical_formula_moiety         'As Mo Na O6'
_chemical_formula_structural     'Na (Mo O2)(As O4)'
_chemical_formula_sum            'As Mo Na O6'
_chemical_formula_weight         289.85
_chemical_name_systematic
;
sodium dioxidomolybdenum(VI) arsenate(V)
;
_space_group_IT_number           62
_symmetry_cell_setting           orthorhombic
_symmetry_space_group_name_Hall  '-P 2ac 2n'
_symmetry_space_group_name_H-M   'P n m a'
_atom_sites_solution_primary     direct
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_cell_angle_beta                 90.00
_cell_angle_gamma                90.00
_cell_formula_units_Z            4
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_cell_length_b                   6.597(2)
_cell_length_c                   7.420(2)
_cell_measurement_reflns_used    25
_cell_measurement_temperature    298(2)
_cell_measurement_theta_max      15
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_cell_volume                     496.7(2)
_computing_cell_refinement
;
CAD-4 EXPRESS (Duisenberg, 1992; Mac\'i\<cek & Yordanov, 1992)
;
_computing_data_collection
;
CAD-4 EXPRESS (Duisenberg, 1992; Mac\'i\<cek & Yordanov, 1992)
;
_computing_data_reduction        'XCAD4 (Harms & Wocadlo, 1995)'
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_computing_publication_material  'WinGX (Farrugia, 1999)'
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_diffrn_measured_fraction_theta_full 1.000
_diffrn_measured_fraction_theta_max 1.000
_diffrn_measurement_device_type  'Enraf--Nonius CAD-4'
_diffrn_measurement_method       \w/2\q
_diffrn_radiation_monochromator  graphite
_diffrn_radiation_source         'fine-focus sealed tube'
_diffrn_radiation_type           MoK\a
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_diffrn_reflns_theta_max         26.95
_diffrn_reflns_theta_min         3.40
_diffrn_standards_decay_%        1.2
_diffrn_standards_interval_time  120
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_exptl_absorpt_correction_T_max  0.394
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_exptl_absorpt_process_details   '(North <i>et al.</i>, 1968)'
_exptl_crystal_colour            yellow
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_exptl_crystal_density_method    'not measured'
_exptl_crystal_description       prism
_exptl_crystal_F_000             536
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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     'SHELXL97 (Sheldrick, 2008)'
_refine_ls_goodness_of_fit_ref   1.135
_refine_ls_matrix_type           full
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_refine_ls_number_reflns         589
_refine_ls_number_restraints     0
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_refine_ls_shift/su_mean         0.000
_refine_ls_structure_factor_coef Fsqd
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'w = 1/[\s^2^(Fo^2^)+(0.0251P)^2^+0.2566P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_refine_ls_wR_factor_ref         0.0532
_reflns_number_gt                539
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_reflns_threshold_expression     I>2\s(I)
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