Mechanism of ferroelectric phase transition in ultra-dispersed sodium nitrite particles

作者：А. А. Набережнов, Sergey B. Vakhrushev, Yu. A. Kumzerov, Andrei V. Fokin · 发表于：Ferroelectrics · 年份：2021 · DOI：10.1080/00150193.2021.1888229 · 被引用次数：8 · 研究领域：Ferroelectric and Piezoelectric Materials、Glass properties and applications、Optical and Acousto-Optic Technologies

A mechanism of the ferroelectric phase transition in nanocomposite materials based on porous glasses with the average pore diameter of 7 nm with embedded sodium nitrite has been discussed. The results of analysis of temperature evolution of structure, thermal vibrations of ions, and interatomic distances are presented for these nanocomposites. It is shown that the thermal vibrations play the important role in a modification of ferroelectric phase transition from the first order, characterizing bulk compound, to the second order in ultra-dispersed sodium nitrite nanoparticles.