data_2000486
_journal_name_full  'Acta Cryst.'
_journal_year  1992
_journal_volume  C48
_journal_page_first  2062
_journal_page_last  2064
loop_
_publ_author_name
 'LeFur, Y.'
 'Khaidukov, N.M.'
 'Aleonard, S.'
_chemical_formula_sum  'K1 Y0.95 Er0.05 F4'
_chemical_formula_weight  209.4
_symmetry_cell_setting  trigonal
_symmetry_space_group_name_H-M  'P 31'
_symmetry_space_group_name_Hall  ?
_cell_length_a  14.075(2)
_cell_length_b  14.075(2)
_cell_length_c  10.115(2)
_cell_angle_alpha  90.0
_cell_angle_beta  90.0
_cell_angle_gamma  120.0
_cell_volume  1735.2
_cell_formula_units_z  18
_cell_measurement_reflns_used  25
_cell_measurement_theta_min  10
_cell_measurement_theta_max  17
_cell_measurement_temperature  293
_exptl_crystal_description  Sphere
_exptl_crystal_colour  Pink
_exptl_crystal_size_max  ?
_exptl_crystal_size_mid  ?
_exptl_crystal_size_min  ?
_exptl_crystal_size_rad  0.14
_exptl_crystal_density_diffrn  3.607
_exptl_crystal_density_meas  ?
_exptl_absorpt_coefficient_mu  8.953
_exptl_absorpt_correction_type  spherical
_exptl_absorpt_correction_T_min  0.165
_exptl_absorpt_correction_T_max  0.190
_diffrn_radiation_type  AgK\a
_diffrn_radiation_wavelength  0.5608
_diffrn_measurement_device  'Nonius CAD-4'
_diffrn_measurement_method  \w/2\q
_diffrn_reflns_number  21625
_diffrn_reflns_av_R_equivalents  0.04
_diffrn_reflns_theta_max  30
_diffrn_reflns_limit_h_min  -25
_diffrn_reflns_limit_h_max  25
_diffrn_reflns_limit_k_min  -25
_diffrn_reflns_limit_k_max  25
_diffrn_reflns_limit_l_min  -18
_diffrn_reflns_limit_l_max  18
_diffrn_standards_number  3
_diffrn_standards_interval_count  ?
_diffrn_standards_interval_time  120
_diffrn_standards_decay_%  0
_reflns_number_total  6834
_reflns_number_observed  4503
_reflns_observed_criterion  I>=3\s^2^(I)
_refine_ls_structure_factor_coef  F
_refine_ls_R_factor_obs  0.032
_refine_ls_wR_factor_obs  0.035
_refine_ls_goodness_of_fit_obs  3.494
_refine_ls_number_reflns  2667
_refine_ls_number_parameters  325
_refine_ls_hydrogen_treatment  ?
_refine_ls_weighting_scheme  unit
_refine_ls_shift/esd_max  0.10
_refine_diff_density_max  1.613
_refine_diff_density_min  -1.487
_refine_ls_extinction_method  'Stout & Jensen (1968)'
_refine_ls_extinction_coef  '2.56882E-7'
_atom_type_scat_source
;
 International Tables for X-ray Crystallography (1974, Vol. IV)
;
loop_
_atom_site_label
_atom_site_fract_x
_atom_site_fract_y
_atom_site_fract_z
_atom_site_U_iso_or_equiv
 Y(1) .12865(6) .88796(6) .330 .610(10)
 Y/Er(2)* .28185(6) .73059(6) .31970(8) .690(10)
 Y(3) .77939(6) .20554(6) .33599(9) .450(10)
 Y/Er(4)* .94122(7) .05763(7) .32600(10)
            1.020(10)
 Y(5) .45347(6) .54609(7) .32166(9) .610(10)
 Y/Er(6)* .60489(7) .38771(6) .34117(7) .560(10)
 K(7) .7825(2) .7171(3) .3146(3) 1.66(5)
 K(8) .2662(2) .2184(3) .3451(3) 1.98(5)
 K(9) .1044(2) .3941(2) .3079(3) 1.73(5)
 K(10) .6101(2) .8777(2) .3426(3) 1.08(4)
 K(11) .9463(3) .5602(2) .3430(3) 1.58(5)
 K(12) .4559(3) .0638(3) .3135(3) 1.99(6)
 F(1) .1305(6) .9361(6) .1123(8) 1.60(10)
 F(1A) .0702(7) .8781(7) .5366(9) 1.9(2)
 F(2A) .3350(10)
      .7297(8) .6510(10)
           4.0(3)
 F(2) .2102(8) .5942(7) .4650(10)
           2.4(2)
 F(3) .7356(6) .2026(5) .5536(8) 1.30(10)
 F(3A) .7898(7) .2698(6) .1270(8) 1.70(10)
 F(4) 1.0010(10)
      .0606(8) .6540(10)
           3.9(3)
 F(4A) .0505(8) .1247(9) .1400(10)
         3.8(2)
 F(5) .3953(6) .5399(6) .5302(8) 1.30(10)
 F(5A) .4605(6) .5941(6) .1047(7) 1.20(10)
 F(6) .5439(6) .2869(5) .5243(7) 1.20(10)
 F(6A) .7323(6) .3943(6) .6710(10)
         1.6(2)
 F(7) .7673(6) .7304(6) .0577(8) 1.80(10)
 F(7A) .8107(6) .7259(5) .5670(7) 1.20(10)
 F(8) .2502(6) .2240(7) .6014(9) 1.8(2)
 F(8A) .8084(6) .0744(5) .4262(8) 1.4(2)
 F(9) .1335(6) .3935(6) .5640(8) 1.10(10)
 F(9A) .0928(6) .4033(7) .0550(10)
         1.7(2)
 F(10) .1522(6) .7562(6) .4169(9) 1.60(10)
 F(10A) .5869(6) .8833(6) .5960(10)
          1.70(10)
 F(11) .9365(5) .5744(6) .5955(8) 1.10(10)
 F(11A) .9450(5) .5313(6) .0882(8) 1.20(10)
 F(12) .4848(7) .0676(7) .5627(9) 1.8(2)
 F(12A) .4506(6) .0858(6) .0520(8) 1.30(10)