Relationship between the micro-structure and dielectric properties of novel rare earth based NaSrRE(WO4)3(RE=Ce, Nd, Sm) microwave ceramics

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-19 DOI:10.1016/j.ceramint.2024.09.265

Yang Liu, Haiqing Deng, Xiuli Chen, Xu Li, Huanfu Zhou

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Abstract

By adopting the solid-state reaction method, rare-earth-based NaSrRE (WO₄)₃ (RE = Ce, Nd, Sm) ceramics were successfully synthesized. The investigation also focused on the relationship between the microstructure and microwave dielectric properties. X-ray diffraction (XRD) results indicated that NaSrRE (WO₄)₃ ceramics exhibit a tetragonal scheelite structure with a space group of I4₁/a. It was found that the incorporation of smaller rare earth ions leads to a reduction in cell volume. The NaSrCe(WO₄)₃ ceramics sintered at 1250 °C exhibited excellent dielectric properties with ε_r = 8.84, Q×f = 73128 GHz, τ_f = −47.17 ppm/°C, the NaSrNd(WO₄)₃ ceramics sintered at 1225 °C showed dielectric properties of ε_r = 9.14, Q×f = 47824 GHz, τ_f = −55.56 ppm/°C, and the NaSrSm(WO₄)₃ ceramics sintered at 1225 °C demonstrated excellent dielectric properties with ε_r = 9.31, Q×f = 69141 GHz, τ_f = −46.99 ppm/°C. In general, the incorporation of rare earth ions of varying sizes at the A site of the scheelite structure can enhance the dielectric properties of the ceramics to some extent.

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新型稀土基 NaSrRE(WO4)3（RE=铈、钕、钐）微波陶瓷的微观结构与介电特性之间的关系

通过采用固态反应方法，成功合成了稀土基 NaSrRE (WO4)3（RE = Ce、Nd、Sm）陶瓷。研究还重点关注了微观结构与微波介电性能之间的关系。X 射线衍射 (XRD) 结果表明，NaSrRE (WO4)3 陶瓷呈现空间群为 I41/a 的四方白钨矿结构。研究发现，加入较小的稀土离子会导致电池体积减小。在 1250 °C 下烧结的 NaSrCe(WO4)3 陶瓷显示出卓越的介电性能：εr = 8.84，Q×f = 73128 GHz，τf = -47.17 ppm/°C；在 1225 °C 下烧结的 NaSrNd(WO4)3 陶瓷显示出介电性能：εr = 9.14, Q×f = 47824 GHz, τf = -55.56 ppm/°C，而在 1225 °C 下烧结的 NaSrSm(WO4)3 陶瓷则表现出优异的介电性能，εr = 9.31, Q×f = 69141 GHz, τf = -46.99 ppm/°C。一般来说，在白钨矿结构的 A 位加入不同大小的稀土离子可在一定程度上提高陶瓷的介电性能。

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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.