Low permittivity germanate LaAlGe2O7 ceramics: Synthesis, sintering behavior, spectral characteristics and microwave dielectric properties

IF 5.1 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS Ceramics International Pub Date : 2024-09-24 DOI:10.1016/j.ceramint.2024.09.325

Qinglan Yang, Yinghan He, Xiaoli Wei, Xiuli Chen, Huanfu Zhou

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Abstract

Novel low permittivity LaAlGe₂O₇ ceramics was prepared by a solid-state reaction method, and the relationship between microstructure and microwave properties was revealed. XRD and Rietveld refinement confirmed that the crystal structure of LaAlGe₂O₇ is monoclinic P2₁/c space group. Raman spectroscopy reflects the trend of internal structural order and phonon-damping behavior of LaAlGe₂O₇ ceramics. The ceramic sintered at 1250 °C exhibited the best surface morphology and optimum microwave dielectric properties of ε_r = 9.22, Q × f = 33417 GHz, τ_f = −71.68 ppm/°C. The lattice energy and packing fraction are used to explain the change of Q × f value. The relationship between phonon damping behavior and microwave dielectric properties was revealed. The temperature stability was studied by bond valence. The LaAlGe₂O₇ ceramics is a strong candidate for the substrate material of millimeter wave communication.

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低介电常数锗酸盐 LaAlGe2O7 陶瓷：合成、烧结行为、光谱特性和微波介电性能

采用固态反应法制备了新型低介电常数 LaAlGe2O7 陶瓷，并揭示了微观结构与微波特性之间的关系。XRD 和 Rietveld 精炼证实 LaAlGe2O7 的晶体结构为单斜 P21/c 空间群。拉曼光谱反映了 LaAlGe2O7 陶瓷内部结构秩序和声子阻尼行为的变化趋势。在 1250 °C 下烧结的陶瓷具有最佳的表面形貌和最佳的微波介电性能：εr = 9.22，Q × f = 33417 GHz，τf = -71.68 ppm/°C。晶格能和堆积分数用于解释 Q × f 值的变化。揭示了声子阻尼行为与微波介电性能之间的关系。通过键价研究了温度稳定性。LaAlGe2O7 陶瓷是毫米波通信基底材料的有力候选材料。

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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.