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Lanthanum Cerium Oxide
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_chemical_formula_sum             'La0.5 Ce0.5 O1.75'
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_symmetry_cell_setting            cubic
_symmetry_space_group_name_H-M    Fm-3m
_symmetry_Int_Tables_number       225
loop_
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' z, -x, -y'
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_cell_length_a                    5.577
_cell_length_b                    5.577
_cell_length_c                    5.577
_cell_angle_alpha                 90.0
_cell_angle_beta                  90.0
_cell_angle_gamma                 90.0
_cell_volume                      173.5
_cell_formula_units_Z             4

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O    O-2  8   0.875 0.25     0.25     0.25     0.5      Biso
Ce   Ce+3 4   0.5   0.0      0.0      0.0      0.5      Biso
La   La+3 4   0.5   0.0      0.0      0.0      0.5      Biso
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