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- Title
Phase Relations and Physical Properties of Layered Pb-Containing Nd<sub>2</sub>MoO<sub>6</sub> Compounds.
- Authors
Voronkova, Valentina; Orlova, Ekaterina; Kazakov, Sergey; Kharitonova, Elena; Belov, Dmitry
- Abstract
The phase relations along the Nd2MoO6-PbO join of the ternary Nd2O3-MoO3-PbO system have been studied by means of solid-state synthesis in air. The samples with high Pb content underwent a reversible first-order phase transition near 820 °C. XRD analysis revealed two tetragonal phases, the high-temperature centric phase ( I41/ acd) and the low-temperature acentric phase ( I $\bar {4}$2 m). In the region of the phase transition, the permittivity of the Pb-containing samples show a strong lambda-type anomaly and electrical conductivity increases sharply by one and half orders of magnitude. The conductivities of the Pb-containing samples reach 10-2 S/cm at 850 °C, which is two orders of magnitude greater than the conductivity of pure Nd2MoO6. The conductivity in such compounds may be due to oxygen ions. A permittivity anomaly, existence of a piezoelectric effect, and the symmetry change from acentric I $\bar {4}$2 m to centric I41/ acd may indicate an antiferroelectric nature of the phase transition.
- Subjects
PHASE transitions; LEAD oxides; NEODYMIUM compounds; ELECTRIC conductivity; X-ray diffraction; ELECTRICAL conductors; PIEZOELECTRICITY
- Publication
European Journal of Inorganic Chemistry, 2016, Vol 2016, Issue 7, p1022
- ISSN
1434-1948
- Publication type
Article
- DOI
10.1002/ejic.201501167