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首页> 外文会议>2013 IEEE International Symposium on the Applications of Ferroelectric and Workshop on the Piezoresponse Force Microscopy >Influence of germanium substitution on dielectric and ferroelectric properties of Ba(Fe0.5Nb0.5)O3 ceramics
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Influence of germanium substitution on dielectric and ferroelectric properties of Ba(Fe0.5Nb0.5)O3 ceramics

机译：锗取代对Ba（Fe0.5Nb0.5）O3陶瓷介电和铁电性能的影响

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摘要

In this work, the influence of Ge4+ substitution on dielectric and ferroelectric properties of high dielectric BaFe0.5Nb0.5O3 ceramics was studied. The BGFN powders with a formula BaGex(Fe0.5Nb0.5)1−xO3 where x = 0.01, 0.015, 0.02 and 0.025 were produced via mixed-oxide method and subsequently calcined at 1100–1200°C for 4 h. To form the BGFN ceramics, the resulting powders were pressed into pellets and sintered at various temperatures from 1200 to 1350°C for 4 h in order to obtain the ceramic with maximum density under each condition. The phase formation, microstructure and electrical properties of these ceramics were investigated. It was found that the Ge4+ substitution played an important role on the change of crystal structures and the phase formation of the BFN ceramics. The appearance of peak shift and peak split in XRD patterns confirmed the structural change from cubic to monoclinic in the ceramic samples at higher Ge4+ content. The ceramics with x ≥ 0.015 contained three phases of BGFN, Ba3Fe2Ge4O14 and BaGeO3. The amount of each phase was depended on the concentration of Ge4+ where the Ba3Fe2Ge4O14 and BaGeO3 phases were found to increase with increasing x content. It was also found that the higher porosity and smaller grain sizes were found in the BGFN ceramics with higher level of Ge4+ addition. This in turn affected their dielectric properties where dielectric constant was substantially decreased while the dielectric loss was greatly improved. The optimum composition for this system was found to be x = 0.015, where the maximum dielectric constant (∼12282) with lower dielectric loss at room temperature were obtained.
机译：本文研究了Ge ​​ 4 + 取代对高介电常数BaFe0.5Nb0.5O3陶瓷介电和铁电性能的影响。通过混合氧化物法制备了具有BaGex（Fe0.5Nb0.5）1-xO3的BGFN粉末，其中x = 0.01、0.015、0.02和0.025，然后在1100–1200°C下煅烧4 h。为了形成BGFN陶瓷，将所得粉末压制成粒并在1200至1350℃的各种温度下烧结4小时，以便获得在每种条件下具有最大密度的陶瓷。研究了这些陶瓷的相形成，微观结构和电性能。发现Ge 4 + 取代对BFN陶瓷的晶体结构变化和相形成起着重要作用。 XRD图谱中出现峰移和峰裂的现象证实了Ge 4 + 含量较高的陶瓷样品中立方晶向单斜晶的结构变化。 x≥0.015的陶瓷包含BGFN，Ba3Fe2Ge4O14和BaGeO3的三相。每个相的数量取决于Ge 4 + 的浓度，其中发现Ba3Fe2Ge4O14和BaGeO3相随x含量的增加而增加。还发现在添加了更高含量的Ge 4 + 的BGFN陶瓷中孔隙率更高，晶粒尺寸更小。这进而影响了它们的介电性能，其中介电常数显着降低，而介电损耗得到了极大的改善。发现该系统的最佳组成为x = 0.015，其中获得了室温下介电损耗较低的最大介电常数（〜12282）。

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