The crystal structure of NdGaO3 at 100 K and 293 K based on synchrotron data
2000; Elsevier BV; Volume: 297; Issue: 1-2 Linguagem: Inglês
10.1016/s0925-8388(99)00603-9
ISSN1873-4669
AutoresL. Vasylechko, L. G. Akselrud, W. Morgenroth, U. Bismayer, A. Matkovskii, D. Savytskii,
Tópico(s)Thermal Expansion and Ionic Conductivity
ResumoThe crystal structure of NdGaO3 is studied at 100 K and 293 K using synchrotron single crystal data. The NdGaO3 structure belongs at low and at room-temperatures to the orthorhombically distorted perovskite-type (space group Pbnm, Z=4). The analysis reveals that both structures differ considerably in the character of the thermal motions of the cations. The Nd and Ga thermal ellipsoids at 100 K are reorientated compared with those at 293 K. The anharmonic thermal motions of Nd and Ga, determined for 100 K and 293 K, are displayed by 4-rank polar tensors. The thermal anomaly of the physical properties of NdGaO3 seems therefore, to be well reflected by the thermal behaviour of the cations.
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