The first investigation of europium silicate melilite for second-order nonlinear optical application: experimental and theoretical studies.
Chi, Yang; Xue, Huai-Guo; Guo, Sheng-Ping; Dalton transactions (Cambridge, England : 2003) 47 (2018) 13434–13441; doi:10.1039/c8dt02701c

data_7047315
_publ_section_title
;
 The first investigation of europium silicate melilite for second-order
 nonlinear optical application: experimental and theoretical studies.
;
_journal_issue                   38
_journal_name_full
'Dalton transactions (Cambridge, England : 2003)'
_journal_page_first              13434
_journal_page_last               13441
_journal_paper_doi               10.1039/c8dt02701c
_journal_volume                  47
_journal_year                    2018
_chemical_formula_moiety         '0.5(Eu4 Mg2 O14 Si4)'
_chemical_formula_sum            'Eu2 Mg O7 Si2'
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_space_group_crystal_system      tetragonal
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_space_group_name_Hall           'P -4 2ab'
_space_group_name_H-M_alt        'P -4 21 m'
_symmetry_space_group_name_Hall  'P -4 2ab'
_symmetry_space_group_name_H-M   'P -4 21 m'
_atom_sites_solution_primary     direct
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Olex2 1.2-alpha
(compiled 2018.03.09 svn.r3491 for OlexSys, GUI svn.r5480)
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_refine_ls_abs_structure_details
;
 Flack x determined using 182 quotients [(I+)-(I-)]/[(I+)+(I-)]
 (Parsons, Flack and Wagner, Acta Cryst. B69 (2013) 249-259).
;
_refine_ls_abs_structure_Flack   -0.02(3)
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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^)+(0.0824P)^2^+0.8431P] where P=(Fo^2^+2Fc^2^)/3'
_refine_ls_weighting_scheme      calc
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_reflns_threshold_expression     'I > 2\s(I)'
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_cod_data_source_block           a
_cod_depositor_comments          'Adding full bibliography for 7047315.cif.'
_cod_original_cell_volume        333.52(5)
_cod_database_code               7047315
_shelx_shelxl_version_number     2014/7
_shelx_estimated_absorpt_t_max   0.598
_shelx_estimated_absorpt_t_min   0.516
_olex2_refinement_description
;
;
_shelx_res_checksum              27109
_shelx_hkl_checksum              15497
_olex2_submission_special_instructions 'No special instructions were received'