科研之友
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摘要
We performed structural analysis of PbHfo(3) between 10 and 500K in the room-temperature antiferroelectric phase and the cubic phase using powder neutron diffraction. Disordered arrangements of Pb atoms were not detected in the cubic phase in contrast to the results of X-ray diffraction. This indicates that Pb atoms have an electron-density distribution that spreads out more widely than the expected distribution in isolated Pb ions. The simple concept of order parameters in soft-mode condensation, that is, all atomic shifts show proportional temperature dependences, was not observed in the antiferroelectric phase of PbHfO3. However, physical properties, such as lattice distortion, show the temperature dependences predicted on the basis of a phenomenological theory as if the simple concept were applicable over the entire temperature range.
- 出版日期2008-6
