Structures and phase transitions of trigonal ZrMo2O8 and HfMo2O8

Allen, S.; Ward, R.J.; Hampson, M.R.; Gover, R.K.B.; Evans, J.S.O.

doi:10.1107/S0108768103025138

Acta Crystallographica Section B
Acta Crystallographica
Section B STRUCTURAL SCIENCE, CRYSTAL ENGINEERING AND MATERIALS

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Figure 4
Diffraction data of trigonal ZrMo₂O₈ at 302 (lower trace) and 600 K (upper trace). Bragg reflections at ∼21.7, 25.0 and 28.0° disappear in the high-temperature pattern. The upper tick marks are for P $[\overline 3]$ m1 (600 K model) and the lower marks are for P $[\overline 3]$ 1c (302 K model). The small peaks marked with points at 28.3° are due to a minor ZrO₂ impurity. The apparent appearance of an additional peak at ∼30° 2θ at 600 K is caused by anisotropic thermal expansion that splits the (030) and (002) reflections, which have almost identical 2θ values at 302 K.

STRUCTURAL SCIENCE
CRYSTAL ENGINEERING
MATERIALS

ISSN: 2052-5206

Volume 60| Part 1| January 2004| Pages 32-40

doi:10.1107/S0108768103025138

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