用于 LTCC 应用的温度稳定 (1-x)BaAl2Si2O8-xBa3V2O8 (0.2 ≤ x ≤ 0.5) 微波介质复合陶瓷

IF 5.8 2区 材料科学 Q1 MATERIALS SCIENCE, CERAMICS
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引用次数: 0

摘要

BaAl2Si2O8 微波介电陶瓷具有低介电常数(εr)和低损耗的介电特性,而且合成成本低,因此很有希望实现商业化。然而,六方结构会发生高温相变,从而降低抗热震性和耐用性,阻碍了其实际应用。在这项工作中,我们报告了温度稳定的 BaAl2Si2O8-Ba3V2O8 低温共烧陶瓷(LTCC)。Ba3V2O8 与 G9 玻璃的结合实现了接近零的τf 和 ∼ 8.5 ppm/℃ 的热膨胀系数,显著提高了 BaAl2Si2O8 陶瓷的温度稳定性。通过采用离子置换和增强晶格无序性,G9 玻璃的成分经过策略性设计,成功地诱导了 BaAl2Si2O8 相从六方到单斜的转变。在 900 ℃ 下烧结的 0.5BaAl2Si2O8-0.5Ba3V2O8-9 wt% G9 的介电性能为 εr ∼ 9,Q×f ∼ 22,000 GHz,τf ∼ +1.9 ppm/℃。通过进一步研究共烧行为,证实了与银粉良好的化学兼容性。这项工作为基于 BaAl2Si2O8 的 LTCC 提供了有吸引力的候选材料,也为改性 BaAl2Si2O8 陶瓷提供了可用的方法。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Temperature stable (1-x)BaAl2Si2O8-xBa3V2O8 (0.2 ≤ x ≤ 0.5) microwave dielectric composite ceramics for LTCC applications
BaAl2Si2O8 microwave dielectric ceramics possess dielectric properties of low permittivity (εr) and low loss, coupled with low synthesis cost, making them promising for commercialization. However, the hexagonal structure undergoes high-temperature phase transitions that deteriorate thermal shock resistance and durability, hindering its practical use. In this work, we report temperature-stable BaAl2Si2O8-Ba3V2O8 low temperature co-fired ceramics (LTCC). The combination of Ba3V2O8 and G9 glass achieved a near-zero τf and a thermal expansion coefficient of ∼ 8.5 ppm/℃, significantly enhancing the temperature stability of BaAl2Si2O8 ceramics. By employing ion substitution and enhancing lattice disorder, the components of G9 glass were strategically designed to successfully induce hexagonal-to-monoclinic transformation of BaAl2Si2O8 phase. The dielectric properties of 0.5BaAl2Si2O8-0.5Ba3V2O8-9 wt% G9 sintered at 900 ℃ were εr ∼9, Q×f ∼22,000 GHz and τf ∼ +1.9 ppm/℃. Good chemical compatibility with silver powders was confirmed by further investigation of the co-firing behavior. This work provides attractive candidate for BaAl2Si2O8-based LTCCs and an available approach for modifying BaAl2Si2O8 ceramics.
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来源期刊
Journal of The European Ceramic Society
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.
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