Single-Crystal Neutron Diffraction Investigations on the Phase Transitions in CeO1.800 and CeO1.765

Author： Kümmerle E.A.   Güthoff F.   Schweika W.   Heger G.  

Publisher： Academic Press

ISSN： 0022-4596

Source： Journal of Solid State Chemistry, Vol.153, Iss.2, 2000-09, pp. : 218-230

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Abstract

Information on the controversial phase diagram of CeOy (1.65<y≤2.0) was obtained by making single-crystal neutron scattering measurements on CeO1.800 and CeO1.765 up to 1064 K. The observed phase transitions at 755 K, 823 K, 866 K, and 898 K when the temperature is raised (or 738 K, 773 K, 845 K, and 898 K when T is lowered) for CeO1.800 as well as the observed phase transition at 911 K (907 K) for CeO1.765 qualitatively confirm the phase diagram proposed previously by Ricken et al. The crystal structures of all the observed phases apparently are of rhombohedral symmetry (space group R3).

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