Influence of Ca2+ Substitution on Elastic Properties of CaCu3Ti4O12 Quadruple Perovskites Determined by Ultrasonic Pulse Echo Selection Technique

IF 0.9 4区 材料科学 Q4 MATERIALS SCIENCE, CHARACTERIZATION & TESTING
D. J. Parekh, D. V. Barad, D. K. Thummar, N. S. Kanani, K. B. Modi
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Abstract

The structural, microstructural, optical, and elastic properties of polycrystalline perovskite series, Ca1+xCu3–xTi4O12; x = 0–1.0, have been investigated employing X-ray powder diffractometry, scanning electron microscopy, UV–Vis spectroscopy, and ultrasonic pulse-echo selection technique at 300 K. The primary structural parameter and ultrasonic parameters; longitudinal wave velocity (V1), the amplitude of transmitted and reflected pulses ao/an were used to calculate porous values of various elastic parameters such as shear wave velocities Vs, mean sound velocity Vm, elastic moduli L, B, G, E, Debye temperature θ, Poisson’s ratio σ, acoustic impedance Z, internal friction Q–1, absorptivity A, adiabatic compressibility Ba, Lame’s constant λL, and Vickers micro-hardness Hv. The elastic constants were emended to a void-free state using eight distinct semi-empirical methods. These models are principally relying on the pore morphology in the material. Depending upon the correction model employed, Lo is found to decrease from ~21.5 to ~39.5%, Bo from ~17.4 to 45.6%, while Eo and Go are found to decrease from ~22 to 34% on Ca2+ substitution (x = 0–0.5) in the system. Besides, the observed increase in different elastic moduli for x = 1.0 composition is found to vary from 0.3 to 7%. The compositional dependency of elastic moduli has been explained in terms of the change in interatomic bonding strength produced by variations in interatomic distances, microstructure, and electronic configuration. The values of Pough’s ratio Bo/Go, Frantsevich’s ratio Go/Bo, and Poisson’s ratio σo suggest the brittle nature of prepared ceramics.

Abstract Image

超声脉冲回波选择技术测定 CaCu3Ti4O12 四元包晶的 Ca2+ 取代对弹性特性的影响
采用 X 射线粉末衍射仪、扫描电子显微镜、紫外可见光谱和超声脉冲回波选择技术,研究了多晶包晶系列 Ca1+xCu3-xTi4O12; x = 0-1.0 的结构、微观结构、光学和弹性特性。主要结构参数和超声参数如下纵波速度 (V1)、透射和反射脉冲的振幅 ao/an 用于计算各种弹性参数的多孔值,如剪切波速度 Vs、平均声速 Vm、弹性模量 L、B、G、E、德拜温度 θ、泊松比 σ、声阻抗 Z、内摩擦力 Q-1、吸收率 A、绝热压缩性 Ba、拉美常数 λL 和维氏硬度 Hv。使用八种不同的半经验方法将弹性常数修正为无空隙状态。这些模型主要依赖于材料中的孔隙形态。根据所采用的修正模型,发现在 Ca2+ 取代(x = 0-0.5)体系中,Lo 从 ~21.5% 下降到 ~39.5%,Bo 从 ~17.4% 下降到 45.6%,而 Eo 和 Go 则从 ~22% 下降到 34%。此外,在 x = 1.0 成分中观察到的不同弹性模量的增加从 0.3% 到 7% 不等。弹性模量的成分依赖性可以用原子间距离、微观结构和电子构型的变化所产生的原子间键合强度的变化来解释。波夫比 Bo/Go、弗兰茨维奇比 Go/Bo 和泊松比 σo 的值表明制备的陶瓷具有脆性。
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来源期刊
Russian Journal of Nondestructive Testing
Russian Journal of Nondestructive Testing 工程技术-材料科学:表征与测试
CiteScore
1.60
自引率
44.40%
发文量
59
审稿时长
6-12 weeks
期刊介绍: Russian Journal of Nondestructive Testing, a translation of Defectoskopiya, is a publication of the Russian Academy of Sciences. This publication offers current Russian research on the theory and technology of nondestructive testing of materials and components. It describes laboratory and industrial investigations of devices and instrumentation and provides reviews of new equipment developed for series manufacture. Articles cover all physical methods of nondestructive testing, including magnetic and electrical; ultrasonic; X-ray and Y-ray; capillary; liquid (color luminescence), and radio (for materials of low conductivity).
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