Ca9-xSrxNd2W4O24 （x = 0,1,2,3,4,5,6,8,9）功能陶瓷的制备与表征

IF 5.6 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Ceramics International Pub Date : 2025-03-01 DOI:10.1016/j.ceramint.2024.12.280

A. Shijin , Annamma John , Sam Solomon

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引用次数: 0

摘要

通过传统的固态陶瓷路线制备Ca9-xSrxNd2W4O24 （x = 0,1,2,3,4,5,6,8,9）功能陶瓷的固溶体。XRD分析揭示了化合物的四方结构，并通过拉曼和傅里叶变换红外光谱进行了证实。利用XRD谱图计算了Ca9Nd2W4O24和Sr9Nd2W4O24的晶格参数，并利用振动谱分析确定了它们的振动带。所有样品的反射光谱的吸收边缘都在330 ~ 360 nm（紫外区）之间，这表明了这些陶瓷作为紫外滤光片的实际应用。利用Tauc图关系计算了带隙能量，并用能量色散x射线能谱（EDS）检测了陶瓷的元素组成。从FESEM图像中可以明显看出，所有样品都以最小的孔隙率获得了最大的致密化。计算了样品的平均晶粒尺寸，结果表明Sr9Nd2W4O24比其他样品含有更多的大尺寸晶粒（边界更少）。样品在25°C和850°C时的介电常数测定表明，与纯样品相比，在这两个温度下，固溶体在5 MHz处都具有较高的介电常数。采用阻抗谱法研究了烧结样品的晶粒、晶界和电极对电性能的影响。利用Arrhenius关系式估计了不同温度下球团的离子电导率，其中电阻由Cole-Cole图中的半圆计算得到。

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Development and characterization of Ca9-xSrxNd2W4O24 (x = 0, 1, 2, 3, 4, 5, 6, 8, 9) functional ceramics

Solid solutions of Ca_9-xSr_xNd₂W₄O₂₄ (x = 0, 1, 2, 3, 4, 5, 6, 8, 9) functional ceramics are prepared through the conventional solid state ceramic route. The XRD analysis revealed the tetragonal structure of the compounds and is confirmed using Raman and Fourier Transform Infrared Spectroscopy. The lattice parameters of Ca₉Nd₂W₄O₂₄ and Sr₉Nd₂W₄O₂₄ are calculated using XRD patterns and the vibrational bands are assigned using vibrational spectroscopic analysis. The absorption edges of the reflectance spectra for all the samples lie between the wavelength range 330–360 nm (UV region) point out the practical use of these ceramics as UV filters. The band gap energy is calculated using Tauc plot relation and the elemental compositions of the ceramics are examined through the energy dispersive X-ray spectroscopy (EDS). From the FESEM images, it is evident that all the samples attain maximum densification with minimum porosity. The average grain size of the samples is calculated and these results substantiate that Sr₉Nd₂W₄O₂₄ contains a greater number of large sized grains (with fewer boundaries) than the other samples. The dielectric constant of the samples determined at 25 °C and 850 °C showed that the solid solutions possess high dielectric constant at 5 MHz for both temperatures, compared to pure samples. The impedance spectroscopic studies are employed to investigate the grain, grain boundary and electrode contribution in the electrical properties of the sintered samples. The ionic conductivity of the pellets at different temperatures is estimated using Arrhenius relation, for which the resistance is obtained from the semicircle in the Cole-Cole plot.

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来源期刊

Ceramics International 工程技术-材料科学：硅酸盐

CiteScore

9.40

自引率

15.40%

发文量

4558

审稿时长

25 days

期刊介绍： Ceramics International covers the science of advanced ceramic materials. The journal encourages contributions that demonstrate how an understanding of the basic chemical and physical phenomena may direct materials design and stimulate ideas for new or improved processing techniques, in order to obtain materials with desired structural features and properties. Ceramics International covers oxide and non-oxide ceramics, functional glasses, glass ceramics, amorphous inorganic non-metallic materials (and their combinations with metal and organic materials), in the form of particulates, dense or porous bodies, thin/thick films and laminated, graded and composite structures. Process related topics such as ceramic-ceramic joints or joining ceramics with dissimilar materials, as well as surface finishing and conditioning are also covered. Besides traditional processing techniques, manufacturing routes of interest include innovative procedures benefiting from externally applied stresses, electromagnetic fields and energetic beams, as well as top-down and self-assembly nanotechnology approaches. In addition, the journal welcomes submissions on bio-inspired and bio-enabled materials designs, experimentally validated multi scale modelling and simulation for materials design, and the use of the most advanced chemical and physical characterization techniques of structure, properties and behaviour. Technologically relevant low-dimensional systems are a particular focus of Ceramics International. These include 0, 1 and 2-D nanomaterials (also covering CNTs, graphene and related materials, and diamond-like carbons), their nanocomposites, as well as nano-hybrids and hierarchical multifunctional nanostructures that might integrate molecular, biological and electronic components.