Strong Negative Thermal Expansion along the O–Cu–O Linkage in CuScO~2~
Li, J.; Yokochi, A.; Amos, T. G.; Sleight, A. W.; Chemistry of Materials 14 (2002) 2602–2606; doi:10.1021/cm011633v

data_4000168
_publ_section_title
;
 Strong Negative Thermal Expansion along the O--Cu--O Linkage in CuScO~2~
;
_journal_coden_ASTM              CMATEX
_journal_issue                   6
_journal_name_full               'Chemistry of Materials'
_journal_page_first              2602
_journal_page_last               2606
_journal_paper_doi               10.1021/cm011633v
_journal_volume                  14
_journal_year                    2002
_chemical_formula_moiety         'Cu O2 Sc'
_chemical_formula_sum            'Cu O2 Sc'
_chemical_formula_weight         140.50
_chemical_name_systematic
;
2H Copper Scandium Oxide
;
_space_group_IT_number           194
_space_group_name_Hall           '-P 6c 2c'
_space_group_name_H-M_alt        'P 63/m m c'
_symmetry_cell_setting           hexagonal
_symmetry_Int_Tables_number      194
_symmetry_space_group_name_Hall  '-P 6c 2c'
_symmetry_space_group_name_H-M   'P 63/m m c'
_cell_angle_alpha                90.00
_cell_angle_beta                 90.00
_cell_angle_gamma                120.00
_cell_formula_units_Z            2
_cell_length_a                   3.2472(4)
_cell_length_b                   3.2472(4)
_cell_length_c                   11.436(1)
_cell_measurement_temperature    1206(1)
_cell_special_details
;
Cell dimensions at this temperature were refined from the powder diffractogram.
;
_cell_volume                     104.43(1)
_diffrn_ambient_temperature      1206(1)
_diffrn_measurement_device_type  'neutron powder diffractometer'
_diffrn_radiation_monochromator  Cu(311)
_diffrn_radiation_probe          neutron
_diffrn_radiation_source         'nuclear reactor'
_diffrn_radiation_type           neutron
_diffrn_radiation_wavelength     1.5402(2)
_exptl_absorpt_coefficient_mu    0.0427
_exptl_absorpt_correction_T_max  0.698
_exptl_absorpt_correction_T_min  0.741
_exptl_absorpt_correction_type   analytical
_exptl_crystal_density_diffrn    4.4682(6)
_exptl_crystal_density_meas      ?
_exptl_crystal_density_method    'not measured'
_pd_char_colour                  blue
_pd_char_particle_morphology     'fine powder'
_pd_instr_geometry
'32 detector neutron diffractometer with vertical focusing'
_pd_instr_location               'NBSR BT-1, NIST (USA)'
_pd_meas_2theta_range_inc        0.05
_pd_meas_2theta_range_max        167.95
_pd_meas_2theta_range_min        3.00
_pd_meas_number_of_points        3300
_pd_meas_scan_method             step
_pd_meas_special_details
;
32 He-3 detectors at 5 degree intervals with a 13 degree scan range covering
 2Theta from 3 to 167 degrees
;
_pd_proc_2theta_range_inc        0.05
_pd_proc_2theta_range_max        153.5
_pd_proc_2theta_range_min        10
_pd_proc_info_data_reduction
;
 Data from the 32 detector banks were converted to a pseudo-single
  detector format using 2-point linear interpolation, after
  correcting for variable detector height masking and detector
  sensitivity, as well as two-theta offset. Where needed, a
  constant was added or subracted to the data in each detector
  as determined by integrating the overlapped regions, to compensate
  for background variations.
A Chebyshev polynomial fit was calculated for the absorption correction
 factors for successive values of theta (the factors were taken from
the International Tables of X-ray Crystallography, Vol. II, p. 295-297)
;
_pd_proc_info_excluded_regions
;
The region from 3.00 to 10.00 was excluded from the refinement
as no reflections were present in this range.
The region from 153.50 to 167.95 was excluded to ensure that the
highest angle data were at the background level.
;
_pd_proc_ls_background_function  '3rd order polynomial'
_pd_proc_ls_pref_orient_corr     none
_pd_proc_ls_profile_function     'Thompson-Cox-Hastings pseudo-Voigt'
_pd_proc_ls_prof_R_factor        4.78
_pd_proc_ls_prof_wR_expected     4.85
_pd_proc_ls_prof_wR_factor       5.87
_pd_spec_mounting                'vanadium can'
_pd_spec_mount_mode              transmission
_pd_spec_orientation             vertical
_pd_spec_shape                   cylinder
_pd_spec_size_axial              50.8
_pd_spec_size_equat              12.7
_pd_spec_size_thick              12.7
_refine_ls_extinction_coef       0
_refine_ls_extinction_method     none
_refine_ls_goodness_of_fit_all   1.47
_refine_ls_matrix_type           fullcycle
_refine_ls_number_constraints    0
_refine_ls_number_parameters     20
_refine_ls_number_restraints     0
_refine_ls_shift/su_max          0.01
_refine_ls_structure_factor_coef Inet
_refine_ls_weighting_scheme      sigma
_cod_original_sg_symbol_Hall     -P6c2c
_cod_original_sg_symbol_H-M      P63/mmc
_cod_database_code               4000168