Microwave dielectric properties of Na2O–Ln2O3–MoO3–TiO2 (Ln = Nd, La and Ce) system with low-sintering temperature

IF 2.3 4区材料科学 Q2 MATERIALS SCIENCE, CERAMICS International Journal of Applied Ceramic Technology Pub Date : 2024-11-12 DOI:10.1111/ijac.14983

Wen-Bo Li, Li-Xia Pang, Xiao-Long Wang, Wei-Guo Liu, Xiaogang Yao, Huixing Lin, Wen-Feng Liu, Di Zhou

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Abstract

This study examines the low-loss and temperature-stable Na₂O–Ln₂O₃–MoO₃–TiO₂ (Ln = Nd, La and Ce) system, synthesized via a solid-state process at low-sintering temperatures ranging from 840°C to 900°C The structure, microstructure and microwave properties of the Na_0.5Ln_0.5MoO₄–TiO₂ (Ln = Nd, La and Ce) ceramics as a function of the sintering temperature were studied. The results of XRD patterns and microstructure characterization showed that the main phase in compositions belong to tetragonal scheelite and tetragonal structure. The ceramic composition Na_0.5Ln_0.5MoO₄–TiO₂ (Ln = Nd, La and Ce), sintered at 840°C–900°C for 2 hours, demonstrated excellent microwave dielectric properties, exhibiting relative dielectric constant (ε_r) of 13.9–14.4, Q × f value of about 31 100 (at 9.66 GHz) – 48 600 GHz (at 9.33 GHz), and temperature coefficient of –8.1 to –1 ppm/°C. Our work designs temperature-stable microwave dielectric ceramics with low-sintering temperature for LTCC technology applications.

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低烧结温度下Na2O-Ln2O3-MoO3-TiO2 （Ln = Nd， La和Ce）体系的微波介电性能

研究了在840℃~ 900℃低温烧结条件下，采用固态工艺合成的低损耗、温度稳定的Na2O-Ln2O3-MoO3-TiO2 （Ln = Nd， La和Ce）体系，研究了Na0.5Ln0.5MoO4-TiO2 （Ln = Nd， La和Ce）陶瓷的结构、微观结构和微波性能随烧结温度的变化规律。XRD图谱和微观结构表征结果表明，合成物中主要物相为四方白钨矿，具有四方结构。在840℃~ 900℃下烧结2 h的陶瓷成分Na0.5Ln0.5MoO4-TiO2 （Ln = Nd， La和Ce）表现出优异的微波介电性能，相对介电常数εr为13.9 ~ 14.4，Q × f值约为31 100 (9.66 GHz) ~ 48 600 GHz (9.33 GHz)，温度系数为- 8.1 ~ - 1 ppm/°C。我们的工作是为LTCC技术设计温度稳定的低烧结温度微波介电陶瓷。

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来源期刊

International Journal of Applied Ceramic Technology 工程技术-材料科学：硅酸盐

CiteScore

3.90

自引率

9.50%

发文量

280

审稿时长

4.5 months

期刊介绍： The International Journal of Applied Ceramic Technology publishes cutting edge applied research and development work focused on commercialization of engineered ceramics, products and processes. The publication also explores the barriers to commercialization, design and testing, environmental health issues, international standardization activities, databases, and cost models. Designed to get high quality information to end-users quickly, the peer process is led by an editorial board of experts from industry, government, and universities. Each issue focuses on a high-interest, high-impact topic plus includes a range of papers detailing applications of ceramics. Papers on all aspects of applied ceramics are welcome including those in the following areas: Nanotechnology applications; Ceramic Armor; Ceramic and Technology for Energy Applications (e.g., Fuel Cells, Batteries, Solar, Thermoelectric, and HT Superconductors); Ceramic Matrix Composites; Functional Materials; Thermal and Environmental Barrier Coatings; Bioceramic Applications; Green Manufacturing; Ceramic Processing; Glass Technology; Fiber optics; Ceramics in Environmental Applications; Ceramics in Electronic, Photonic and Magnetic Applications;