DOI

  • N. A. Zhuk
  • N. A. Sekushin
  • M. G. Krzhizhanovskaya
  • A. V. Koroleva
  • A. A. Reveguk
  • S. V. Nekipelov
  • D. V. Sivkov
  • V. P. Lutoev
  • B. A. Makeev
  • V. V. Kharton
  • A. M. Lebedev
  • R. G. Chumakov
  • K. D. Koksharova
  • A. D. Shpynova

The Bi1.6Сr0.8Ta1.6O7±Δ pyrochlore was synthesized by the solid-phase method (sp. gr. Fd-3m:2, 10.45523(3) Å, Z = 8). The thermal stability of the pyrochlore in air up to 1140 °C has been established. With increasing temperature (30–1200 °C), the unit cell parameter and the thermal expansion coefficient increase isotropically, although weakly from 10.4413 to 10.5255 Å and 4.6 × 10−6 to 9.2 × 10−6 °C − 1. The electron spin resonance spectrum of the Bi1.6Сr0.8Ta1.6O7±Δ contains an intense Lorentz-shaped band (g∼2.05) with a width of ΔBPP∼160 mT. According to X-ray absorption fine structure and X-ray photoelectron spectroscopy, the ions are in the charge states Bi(+3), Ta(+5-δ), Cr(+3). The sample contains shallow traps with a depth of 0.39 eV and deep traps with an energy of 1.7 eV. At temperatures above 400 °C, ion transfer begins to dominate, which is revealed in a decrease in the conductivity activation energy to 0.78 eV.

Язык оригиналаанглийский
Номер статьи112067
ЖурналMaterials Research Bulletin
Том158
Дата раннего онлайн-доступаокт 2022
DOI
СостояниеОпубликовано - фев 2023

    Предметные области Scopus

  • Материаловедение (все)
  • Физика конденсатов
  • Сопротивление материалов
  • Общее машиностроение

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