Effect of donor and acceptor dopants on the microstructure and dielectric properties of barium titanate based ceramics

IF 1.4 4区材料科学 Q3 MATERIALS SCIENCE, CERAMICS

Science of Sintering Pub Date : 2022-01-01 DOI:10.2298/sos2201081p

V. Paunovic, Z. Prijić, V. Mitić

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Abstract

This paper examined the microstructural and dielectric characteristics of BaTiO3 - based ceramics of the general formula BaTi1-x-yNbxMnyO3. The concentration of Mn as acceptor was variable 0.01 and 0.05 at%, while the donor (Nb) was fixed at 0.5 at%. The starting ceramic powders were produced by a conventional solid-state reaction method and sintered at 1290 and 1320oC. In BaTiO3 ceramics doped with a higher Mn concentration (0.05 at% Mn) at a sintering temperature of 1290?C, a bimodal structure with a grain of 10-30 ?m, and 1-5 ?m, was obtained. Sintering at a higher temperature (Tsin = 1320?C), regardless of Mn content, provides the achievement of a uniform microstructure with grains under than 6 ?m. The ceramics doped with 0.01 at% Mn and sintered at 1320?C are characterized by high values of the dielectric constant at room temperature and notable changes in the dielectric constant with temperature. Nb-0.05Mn BaTiO3 doped ceramics sintered at 1290?C show lower dielectric constant values due to the presence of Mn-enriched areas representing paraelectric regions. Areas richer in Mn are associated with the fine-grained structure. The dielectric constant in the investigated systems achieves a constant value for frequencies higher than 3kHz. The Curie temperature of all samples was shifted to lower values in relation to undoped BaTiO3 ceramics. According to Curie-Weiss law were determined the Curie constant C and the Curie temperature Tc.

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给体和受体掺杂对钛酸钡基陶瓷微观结构和介电性能的影响

本文研究了通式BaTi1-x-yNbxMnyO3的BaTiO3基陶瓷的显微结构和介电特性。受体Mn浓度为0.01和0.05(%)，供体Nb浓度为0.5(%)。采用常规固相反应法制备起始陶瓷粉末，分别在1290℃和1320℃下烧结。在烧结温度为1290℃时，掺有较高Mn浓度(0.05 at% Mn)的BaTiO3陶瓷C为10 ~ 30 μ m和1 ~ 5 μ m晶粒的双峰结构。无论Mn含量如何，在较高温度下(Tsin = 1320°C)烧结均可获得晶粒小于6°m的均匀微观结构。陶瓷掺杂0.01 at% Mn，烧结温度为1320?C的特点是室温下介电常数值高，且介电常数随温度变化明显。铌-0.05 mn BaTiO3掺杂陶瓷在1290?C表现出较低的介电常数值，这是由于富锰区域的存在，代表了准电区。锰含量较高的区域与细粒结构有关。在所研究的系统中，介电常数在频率高于3kHz时达到恒定值。与未掺杂BaTiO3陶瓷相比，所有样品的居里温度都降低了。根据居里-魏斯定律确定了居里常数C和居里温度Tc。

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来源期刊

Science of Sintering 工程技术-材料科学：硅酸盐

CiteScore

2.50

自引率

46.70%

发文量

审稿时长

3.3 months

期刊介绍： Science of Sintering is a unique journal in the field of science and technology of sintering. Science of Sintering publishes papers on all aspects of theoretical and experimental studies, which can contribute to the better understanding of the behavior of powders and similar materials during consolidation processes. Emphasis is laid on those aspects of the science of materials that are concerned with the thermodynamics, kinetics and mechanism of sintering and related processes. In accordance with the significance of disperse materials for the sintering technology, papers dealing with the question of ultradisperse powders, tribochemical activation and catalysis are also published. Science of Sintering journal is published four times a year. Types of contribution: Original research papers, Review articles, Letters to Editor, Book reviews.