Ca3CuTi4O12陶瓷的结构、介电、电学和光学性能

IF 1.3 4区材料科学 Q3 CRYSTALLOGRAPHY

Phase Transitions Pub Date : 2022-10-31 DOI:10.1080/01411594.2022.2133707

Sunena Parida, Prativa Pattnaik, S. Mishra, R. Choudhary

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引用次数: 0

摘要

本文报道了用传统的固态反应方法合成Ca3CuTi4O12（CCTO）陶瓷。XRD分析证实了正交结构，平均晶粒尺寸和晶格应变约为96.5 nm和0.116%。场发射扫描电子显微镜（FESEM）分析证实了所有组成元素的重量和原子百分比以及晶粒的团聚率（DSEM/DSC = 7.4）；这可能是观察到的介电常数升高的原因。从拉曼谱线中没有观察到相变的痕迹；因此，观测到的巨介电常数可能与Ti离子的位移无关。能带隙约为3.72 eV，这可能适用于光伏应用。奈奎斯特图和科尔-科尔图都证实了半导体性质。计算了样品的热敏电阻常数（β）、灵敏度因子（α）和稳定性因子；这证实了NTC热敏电阻的特性。

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Structural, dielectric, electrical, and optical properties of the Ca3CuTi4O12 ceramic

ABSTRACT In this communication, the synthesis of the Ca3CuTi4O12 (CCTO) ceramic by a conventional solid-state reaction method is reported. The XRD analysis confirms an orthorhombic structure with average crystallite size and lattice strain are about 96.5 nm and 0.116% respectively. Field emission scanning electron microscope (FESEM) analysis confirms both weight and atomic percentage of all constituent elements and agglomeration rate of grains (DSEM /DSC = 7.4); which may be a possible reason for the observed elevated dielectric constant. No trace of phase transition is observed from the Raman lines; so, the observed giant dielectric constant may not be related to the displacement of Ti ions. The energy bandgap is about 3.72 eV, which may suitable for photovoltaic applications. The semiconducting nature is confirmed from the both Nyquist and Cole–Cole plots. Thermistor constant (β), sensitivity factor (α), and stability factor of the sample were calculated; which confirms the characteristics of the NTC thermistor.

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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.