SrTiO3–BaTiO3 nanocomposites with temperature independent permittivity and linear tunability fabricated using field-assisted sintering from chemically synthesized powders,Journal of Materials Chemistry C

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SrTiO3–BaTiO3 nanocomposites with temperature independent permittivity and linear tunability fabricated using field-assisted sintering from chemically synthesized powders
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-08-04 00:00:00 , DOI: 10.1039/c7tc02629c
M. Airimioaei _{1,

2,

3,

4} , M. T. Buscaglia _{5,

6,

7,

8} , I. Tredici _{8,

9,

10,

11} , U. Anselmi-Tamburini _{8,

9,

10,

11} , C. E. Ciomaga _{1,

2,

3,

4} , L. Curecheriu _{1,

2,

3,

4} , A. Bencan _{12,

13,

14} , V. Buscaglia _{5,

6,

7,

8} , L. Mitoseriu _{1,

2,

3,

4}

Affiliation

SrTiO₃–BaTiO₃ nanocomposites with tailored microstructures exhibit enhanced dielectric properties in comparison to homogeneous ceramics with the same overall composition, including stable permittivity (830 ± 60) over a wide temperature range (−150 to 50 °C), low losses (≤3% between −150 to 150 °C), small dc conductivity (<10⁻¹⁰ S m⁻¹) and reasonable tunability (20% at 35 kV cm⁻¹) with almost linear and weakly hysteretic behavior. The composites were fabricated from a SrTiO₃–BaTiO₃ powder synthesized in situ using a multi-step aqueous solution process. The powder was consolidated using a high-pressure rapid field-assisted sintering method. Good densification without grain growth and only partial interdiffusion between the two perovskites was obtained. The enhanced dielectric properties largely originate from the existence of local composition gradients which determine a distribution of the Curie temperature and, consequently, the formation of a broad permittivity plateau. The fine-grained microstructure and the composite effect further contribute to suppress the temperature dependence of dielectric permittivity while retaining a reasonable tunability.

中文翻译：

SrTiO ₃ -BaTiO ₃纳米复合材料，其具有不依赖温度的介电常数和线性可调性，是通过化学合成粉末通过现场辅助烧结制备的

与具有相同整体组成的均质陶瓷相比，具有定制微结构的SrTiO ₃ -BaTiO ₃纳米复合材料具有增强的介电性能，包括在宽温度范围（−150至50°C）内稳定的介电常数（830±60），低损耗（≤在−150至150°C之间为3％，直流电导率较小（<10 ^-10 S m ^-1），并且具有合理的可调性（在35 kV cm ^-1时为20％），具有几乎线性和弱磁滞特性。复合材料由原位合成的SrTiO ₃ -BaTiO ₃粉末制成使用多步水溶液工艺。使用高压快速场辅助烧结法将粉末固结。良好的致密化而没有晶粒长大，并且仅获得了两种钙钛矿之间的部分相互扩散。增强的介电性能很大程度上源于局部居里梯度的存在，局部居里梯度决定了居里温度的分布，因此决定了宽介电常数平台的形成。细微的微观结构和复合效应进一步有助于抑制介电常数的温度依赖性，同时保持合理的可调性。

更新日期：2017-09-14

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