Giant dielectric response with reduced loss in ceramics with nominal composition of La1.5Sr0.5NiO4-SiO2
Giant dielectric response with reduced loss in ceramics with nominal composition of La1.5Sr0.5NiO4-SiO2
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标称成分为 La1.5Sr0.5NiO4-SiO2 的陶瓷具有巨大的介电响应并降低了损耗
DOI：
10.1007/s10832-016-0041-2
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发表时间：
2016-12-01
影响因子：
1.7
通讯作者：
Chen, X. M.
中科院分区：
文献类型：
--
作者：
Liu, X. Q.;Liu, G.;Chen, X. M.
研究了不同SiO2添加量的La 1. 5Sr 0. 5 NiO 4陶瓷的结构和介电性能。La1.5Sr0.5NiO4颗粒通过溶胶-凝胶法分散在SiO2基体中，但在烧结过程中，La1.5Sr0.5NiO4颗粒与SiO2发生反应，破坏了颗粒的均匀分布，使复合陶瓷由La1.5Sr0.5NiO4、La9.33Si6O26和NiO相组成。在室温下的介电常数变化不大，而介电损耗可以抑制与适量的SiO2添加剂。在名义成分为La1.5Sr0.5NiO4-0.80SiO2的陶瓷中实现了与温度无关的低损耗巨介电常数。基于阻抗谱分析，复合陶瓷的巨介电响应归因于小极化子跳跃和麦克斯韦-瓦格纳效应的结合。
Structures and dielectric properties of La1.5Sr0.5NiO4ceramics with different contents of SiO2additives were investigated. The La1.5Sr0.5NiO4particles were dispersed into SiO2matrixes via a sol-gel process, while the homogeneous distribution was destroyed by the reaction between La1.5Sr0.5NiO4and SiO2during the sintering process, so the composite ceramics consisted of La1.5Sr0.5NiO4, La9.33Si6O26and NiO phases. The dielectric constants at room temperature varied slightly, while the dielectric losses could be suppressed with a moderate amount of SiO2additive. Temperature-independent giant dielectric constant with low loss was achieved in the ceramics with nominal composition of La1.5Sr0.5NiO4–0.80SiO2. Based on the analysis of impedance spectra, the giant dielectric response in the composite ceramics was attributed to the combination of the small polaronic hopping and Maxwell-Wagner effect.