Anomalous large positive τf of two K20 microwave dielectric ceramics LaMGa11O19 (M = Mg, Zn) as temperature compensators

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

Ceramics International Pub Date : 2025-09-01 DOI:10.1016/j.ceramint.2025.06.187

Feilong Liu , Junqi Chen , Huaicheng Xiang , Jie Li , Yang Yang , Ying Tang , Liang Fang

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引用次数: 0

Abstract

In this work, two novel hexagonal magnetoplumbite-type LaMGa₁₁O₁₉ (M = Mg, Zn) ceramics were prepared and deeply investigated. XRD patterns, SAED and HRTEM images analysis results demonstrated that the LaMGa₁₁O₁₉ (M = Mg, Zn) ceramics are formation of hexagonal magnetoplumbite structure with a space group of P6₃/mmc. Both ceramics exhibited relatively high density (>95 %) and large positive τ_f (+145.1 and + 136.7 ppm/°C), combined with moderate ε_r around 20 and reasonable Q × f values of 19,328 GHz and 22,197 GHz, which be used as a temperature compensator for LTCC applications. The intense rattling effect of La³⁺ cations resulted in abnormally high dielectric constant with a large positive variation by a factor of over 0.70 from the theoretical values calculated using the Clausius-Mossotti formula according to each ion's polarizability, negative τ_αm, and positive τ_f values. The P–V–L chemical bond theory analysis and impedance spectroscopy showed that the large dielectric loss might result from the high ionicity of the La-O bond and conduction loss, thus leading to relatively low Q × f for the LaMGa₁₁O₁₉ (M = Mg, Zn) ceramics.

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两种K20微波介质陶瓷LaMGa11O19 （M = Mg, Zn）作为温度补偿器的反常大正值τf

本文制备了两种新型六方磁铅矿型LaMGa11O19 （M = Mg, Zn）陶瓷，并对其进行了深入研究。XRD图谱、SAED和HRTEM图像分析结果表明，LaMGa11O19 （M = Mg, Zn）陶瓷为六方磁铅石结构，空间群为P63/mmc。这两种陶瓷都具有较高的密度（> 95%）和较大的正τf(+145.1和+ 136.7 ppm/°C)， εr在20左右，Q × f值在19328 GHz和22197 GHz之间，可以作为LTCC应用的温度补偿器。La3+阳离子强烈的咔嗒效应导致了异常高的介电常数，与利用克劳修斯-莫索蒂公式根据每个离子的极化率、负的ταm和正的τf值计算的理论值相比，有超过0.70倍的正变化。P-V-L化学键理论分析和阻抗谱分析表明，较大的介电损耗可能是由于La-O键的高离子性和传导损失造成的，从而导致LaMGa11O19 （M = Mg, Zn）陶瓷的Q × f相对较低。

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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.