Achieving ultra-high Q×f values in Y2O3 ceramics by Sm substitution and enhancing electrical insulation

IF 6.2 2区材料科学 Q1 MATERIALS SCIENCE, CERAMICS

Journal of The European Ceramic Society Pub Date : 2025-09-12 DOI:10.1016/j.jeurceramsoc.2025.117822

Zitao Shi , Xiao Zhang , Aopu Zhang , Shuren Zhang , Bin Tang

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引用次数: 0

Abstract

Reducing the dielectric loss of Y₂O₃ ceramics is crucial for enhancing their performance in high-frequency communication applications. In this study, Y_2-xSm_xO₃ (0 ≤x ≤ 2) ceramics were sintered using a one-step method within a temperature range of 1475°C to 1750°C. The phase composition of the system varies with x: cubic (0 ≤x ≤ 0.8), dual-phase (0.8˂x ≤ 1.2), and monoclinic (1.2 <x ≤ 2). The bond valence of Y atoms decreases from 2.8967 v.u. (x = 0) to 2.6819 v.u. (x = 0.8), resulting in an increase in the ε_r from 10.8–12.3. The Y_1.6Sm_0.4O₃ ceramic (ε_r=11.9 ± 0.4, τ_f=−44.9 ± 0.5 ppm/°C) achieves an ultra-high Q×f value of 164,176 ± 5750 GHz at 12.2 GHz. Complex impedance spectroscopy analysis reveals a strong correlation between the conductive activation energy (E_a) and the Q×f values. Compared to Y₂O₃ ceramics (E_a=1.66 eV), Y_1.6Sm_0.4O₃ ceramic exhibits a higher E_a (1.91 eV), suggesting that the improved insulating properties in this system contribute to its low dielectric loss.

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通过Sm取代和提高电绝缘性实现Y2O3陶瓷的超高Q×f值

降低Y2O3陶瓷的介电损耗是提高其高频通信性能的关键。本研究采用一步法烧结Y2-xSmxO3（0 ≤x ≤ 2）陶瓷，温度范围为1475℃~ 1750℃。体系的相组成随x：立方（0 ≤x ≤ 0.8）、双相（0.8小于x ≤ 1.2）和单斜相（1.2 <x ≤ 2）而变化。Y原子的键价从2.8967 v.u开始降低。（x = 0）到2.6819 v.u。（x = 0.8），导致εr从10.8-12.3增加。Y1.6Sm0.4O3陶瓷(εr = 11.9 ±0.4 ,τf =−44.9 ± 0.5 ppm /°C)实现超高问×f值164176 ± 5750 GHz 12.2 GHz。复阻抗谱分析表明，导电活化能（Ea）与Q×f值有很强的相关性。与Y2O3陶瓷（Ea=1.66 eV）相比，Y1.6Sm0.4O3陶瓷具有更高的Ea(1.91 eV)，这表明Y1.6Sm0.4O3陶瓷具有较低的介电损耗。

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来源期刊

Journal of The European Ceramic Society 工程技术-材料科学：硅酸盐

CiteScore

10.70

自引率

12.30%

发文量

863

审稿时长

35 days

期刊介绍： The Journal of the European Ceramic Society publishes the results of original research and reviews relating to ceramic materials. Papers of either an experimental or theoretical character will be welcomed on a fully international basis. The emphasis is on novel generic science concerning the relationships between processing, microstructure and properties of polycrystalline ceramics consolidated at high temperature. Papers may relate to any of the conventional categories of ceramic: structural, functional, traditional or composite. The central objective is to sustain a high standard of research quality by means of appropriate reviewing procedures.