铈修饰单钙钛矿CaMnO3:结构、介电和输运性质

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2023-05-24 DOI:10.1080/01411594.2023.2214665

R. Meher, Rajib Padhee, Sunena Parida

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引用次数: 0

摘要

摘要在这篇通讯中，讨论了CaMn0.9Ce0.1O3陶瓷（命名为CMCO）的合成（固态反应）和表征（结构、介电和传输）。CMCO具有正交晶体对称性，平均晶粒尺寸分别为108.7nm和0.00375的晶格应变。晶粒以非常紧凑的方式均匀分布，从而形成高度致密的材料，并且平均晶粒尺寸与平均微晶尺寸的比率约为21，这可能是具有更好的介电和导电机制的原因。拉曼的研究证实了所有组成元素的存在。对介电性质的分析表明存在Maxwell-Wagner型色散。阻抗谱的研究揭示了晶粒和晶界如何在定义导电机制方面发挥重要作用，从而证明了非德拜型弛豫。电阻与温度曲线的分析支持NTC热敏电阻的特性。

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Cerium-modified single perovskite CaMnO3: structural, dielectric, and transport properties

ABSTRACT In this communication, the synthesis (solid-state reaction) and characterization (structural, dielectric, and transport) of the CaMn0.9Ce0.1O3 ceramic (named, CMCO) are discussed. The CMCO has an orthorhombic crystal symmetry with an average crystallite size of 108.7 nm and lattice strain of 0.00375 respectively. The grains are distributed uniformly in a very compact manner so that highly dense material is formed and the ratio of average grain size to average crystallite size is about 21, which may be a possible reason for a better dielectric and conductivity mechanism. Raman's study confirms the presence of all constituent elements. The analysis of the dielectric properties suggests the presence of the Maxwell-Wagner type of dispersion. The study of impedance spectroscopy reveals how grains and grain boundaries play an important role to define conductivity mechanism and hence prove a non-Debye type of relaxation. The analysis of the resistance versus temperature plots supports NTC thermistor character.

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来源期刊

Phase Transitions 物理-晶体学

CiteScore

3.00

自引率

6.20%

发文量

审稿时长

1.4 months

期刊介绍： Phase Transitions is the only journal devoted exclusively to this important subject. It provides a focus for papers on most aspects of phase transitions in condensed matter. Although emphasis is placed primarily on experimental work, theoretical papers are welcome if they have some bearing on experimental results. The areas of interest include: -structural phase transitions (ferroelectric, ferroelastic, multiferroic, order-disorder, Jahn-Teller, etc.) under a range of external parameters (temperature, pressure, strain, electric/magnetic fields, etc.) -geophysical phase transitions -metal-insulator phase transitions -superconducting and superfluid transitions -magnetic phase transitions -critical phenomena and physical properties at phase transitions -liquid crystals -technological applications of phase transitions -quantum phase transitions Phase Transitions publishes both research papers and invited articles devoted to special topics. Major review papers are particularly welcome. A further emphasis of the journal is the publication of a selected number of small workshops, which are at the forefront of their field.