Study of the Effect of Adding Nb2O5 on Calcium Titanate-Based Ferroelectric Ceramics

IF 2.8 Q2 ENGINEERING, CHEMICAL
Maxim V. Zdorovets, Gulnaz Zh. Moldabayeva, Inesh Z. Zhumatayeva, Daryn B. Borgekov, Rafael I. Shakirzyanov, Artem L. Kozlovskiy
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Abstract

This paper considers the effect of adding niobium oxide (Nb2O5) to ferroelectric ceramics based on calcium titanate (CaTiO3), and establishes a connection between the observed alterations in strength and dielectric properties and the variation in the Nb2O5 dopant concentration in the ceramics’ composition. The method of mechanochemical solid-phase synthesis was used as the main method for obtaining the ceramics, followed by thermal sintering under specified conditions in order to form a stable phase composition of the ceramics, and to initialize phase transformations in the composition. Based on the assessment of the phase composition of the resulting ceramics, it was determined that a growth in the Nb2O5 dopant concentration beyond 0.10 mol results in the formation of an orthorhombic-phase CaNb2O4 of the Pbcm(57) spatial system, the weight contribution of which grows. A growth in the Nb2O5 additive concentration results in the formation of two-phase ceramics, the formation of which allows for an enhancement in the mechanical strength of ceramics and resistance to external influences. During the study of the dependence of the strength properties on the dopant concentration alteration, a three-stage change in hardness and crack resistance was established, regarding both structural ordering and phase transformations. The measurement of dielectric characteristics showed the direct dependence of dielectric losses and the dielectric constant on the phase composition of ceramics.
添加Nb2O5对钛酸钙基铁电陶瓷的影响研究
本文考虑了在钛酸钙(CaTiO3)基铁电陶瓷中添加氧化铌(Nb2O5)的影响,并将所观察到的强度和介电性能的变化与陶瓷成分中Nb2O5掺杂浓度的变化联系起来。制备陶瓷的主要方法是机械化学固相合成法,然后在规定的条件下进行热烧结,形成稳定的陶瓷相组成,并在组成中初始化相变。通过对所得陶瓷相组成的评价,确定Nb2O5掺杂浓度大于0.10 mol时,Pbcm(57)空间体系的正交相CaNb2O4形成,其重量贡献增大。Nb2O5添加剂浓度的增加导致两相陶瓷的形成,两相陶瓷的形成可以增强陶瓷的机械强度和抗外界影响的能力。在研究掺杂浓度变化对强度性能的影响时,建立了硬度和抗裂性能在结构有序和相变方面的三个阶段变化。介质特性的测量表明,介质损耗和介电常数与陶瓷的相组成有直接关系。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
ChemEngineering
ChemEngineering Engineering-Engineering (all)
CiteScore
4.00
自引率
4.00%
发文量
88
审稿时长
11 weeks
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