Potassium–Sodium Ceramics Modified with Metal Oxide Additives: Synthesis, Microstructure, and Properties

G. M. Kaleva; Калева Г. М.; E. D. Politova; Политова Е. Д.; A. V. Mosunov; Мосунов А. В.; S. Yu. Stefanovich; Стефанович С. Ю.; N. V. Sadovskaya; Садовская Н. В.

doi:10.31857/S0044453723010144

Potassium–Sodium Ceramics Modified with Metal Oxide Additives: Synthesis, Microstructure, and Properties

Autores: Kaleva G.¹, Politova E.¹, Mosunov A.², Stefanovich S.², Sadovskaya N.³
Afiliações:
1. Semenov Institute of Chemical Physics
2. Faculty of Chemistry, Moscow State University
3. Institute of Crystallography, Federal Research Center of Crystallography and Photonics, Russian Academy of Sciences
Edição: Volume 97, Nº 1 (2023)
Páginas: 95-100
Seção: СТРОЕНИЕ ВЕЩЕСТВА И КВАНТОВАЯ ХИМИЯ
URL: https://journals.rcsi.science/0044-4537/article/view/136533
DOI: https://doi.org/10.31857/S0044453723010144
EDN: https://elibrary.ru/BCBOYX
ID: 136533

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Resumo

Single phase ceramic samples of new compounds (1 − x)(K0.5Na0.5)NbO3−xLa(Ag0.5Sb0.5)O3 (x = 0–0.15), modified by metal oxide additives ZnO, CuO, and MnO2, are prepared via a solid state reaction. The crystal structure, microstructure, and dielectric and ferroelectric properties of the samples are studied. It is established that a phase with a perovskite structure and an orthorhombic unit cell formed in each sample. Ferroelectric phase transitions are confirmed via dielectric spectroscopy. Generation of the second harmonic is observed, along with a drop in the temperature of transitions from the ferroelectric orthorhombic phase to the ferroelectric tetragonal phase, and then to the cubic paraelectric phase.

Palavras-chave

potassium–sodium niobate, ceramics, perovskite structure, dielectric properties

Bibliografia

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