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首页> 外文期刊>Journal of Physics, D. Applied Physics: A Europhysics Journal >Influence of oxygen annealing on the dielectric properties of SrBi2(V0.1Nb0.9)(2)O-9 ceramics
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Influence of oxygen annealing on the dielectric properties of SrBi2(V0.1Nb0.9)(2)O-9 ceramics

机译：氧退火对SrBi2（V0.1Nb0.9）（2）O-9陶瓷介电性能的影响

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摘要

The influences of O-2 and N-2 annealing on the dielectric properties of SrBi2(V0.1Nb0.9)(2)O-9 (SBVN) ferroelectrics were studied. Ceramic samples were prepared by reaction sintering a powder mixture of constituent oxides at 950 degreesC for 2 h in air. Some samples were also subsequently annealed at 800 degreesC for 3 h in O-2 or N-2. With O-2 annealing, the Curie point of the S B VN ferroelectrics changed from similar to 433 to similar to 438 degreesC and the peak dielectric constant increased from similar to 760 to similar to 1010 (at 100 kHz). However, no change in the Curie point was found with N-2 annealing. Furthermore, O-2 annealing was found to reduce significantly both the dielectric constant and loss tangent of the SBVN ferroelectrics at frequencies below 1000 Hz. XRD results revealed a small reduction in the lattice constants with O-2 annealing, but no appreciable change with N-2 annealing. In addition, no detectable change in the microstructure of the SBVN samples was found with annealing. These results imply that Some V4+ ions, which are compensated by the formation of oxygen vacancies, existed in the SBVN ferroelectrics prior to O-2 annealing. V4+ ions were oxidized to V5+ with O-2 annealing, which resulted in improved dielectric properties. [References: 19]
机译：研究了O-2和N-2退火对SrBi2（V0.1Nb0.9）（2）O-9（SBVN）铁电介质介电性能的影响。通过在空气中在950摄氏度下反应烧结组成氧化物的粉末混合物2小时来制备陶瓷样品。随后还将一些样品在O-2或N-2中于800℃退火3小时。通过O-2退火，S B VN铁电体的居里点从相似的433变为相似的438℃，峰值介电常数从相似的760增加到相似的1010（在100 kHz下）。但是，通过N-2退火未发现居里点的变化。此外，发现在低于1000 Hz的频率下，O-2退火可显着降低SBVN铁电介质的介电常数和损耗角正切。 XRD结果表明，使用O-2退火后，晶格常数略有降低，但使用N-2退火后，晶格常数没有明显变化。另外，通过退火未发现SBVN样品的微观结构可检测到的变化。这些结果表明，在O-2退火之前，SBVN铁电体中已经存在一些V4 +离子，这些离子通过氧空位的形成得到补偿。通过O-2退火将V4 +离子氧化为V5 +，从而改善了介电性能。 [参考：19]

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