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

Authors: Kaleva G.M.¹, Politova E.D.¹, Mosunov A.V.², Stefanovich S.Y.², Sadovskaya N.V.³
Affiliations:
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
Issue: Vol 97, No 1 (2023)
Pages: 95-100
Section: СТРОЕНИЕ ВЕЩЕСТВА И КВАНТОВАЯ ХИМИЯ
Submitted: 27.02.2025
Published: 01.01.2023
URL: https://freezetech.ru/0044-4537/article/view/668890
DOI: https://doi.org/10.31857/S0044453723010144
EDN: https://elibrary.ru/BCBOYX
ID: 668890

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Abstract

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.

Keywords

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

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