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Effects of non-stoichiometry on the microstructure and microwave dielectric properties of Ba 1+x Cu 2 V 2 O 8 ( x = 0.15, 0.25, 0.35) ceramics
Journal of Materials Science: Materials in Electronics ( IF 2.8 ) Pub Date : 2020-09-21 , DOI: 10.1007/s10854-020-04472-7
Zhenjun Qing , Jiawen Cheng , Haiyan Li , Yan Xue

The Ba1+xCu2V2O8 (x = 0.15, 0.25, 0.35) ceramics were synthesized using the conventional solid-state reaction sintering method. The effects of the non-stoichiometry on the crystalline phases, densification sintering, microtopography, and microwave dielectric properties of the Ba1+xCu2V2O8 (x = 0.15, 0.25, 0.35) ceramics were studied. In the sample (x = 1) prepared according to the stoichiometry, only the single crystalline phase of BaCu2V2O8 existed. The excess of Ba2+ ions directly led to the precipitation of a new Ba2V2O7 phase. The detection of element composition using EDS also confirmed the results of the phase composition. The SEM results indicated that the microstructure of the ceramics became loose with the increase of Ba2+ ion content. The theoretical microwave dielectric properties were calculated according to the general formula of compounds. The results of the calculation showed that the precipitation of the Ba2V2O7 phase was the main factor affecting the microwave dielectric properties of the ceramics. The measured results of microwave dielectric properties were consistent with the calculated results. The microwave dielectric properties of the Ba1.35Cu2V2O8 sample calcined at 725 °C for 6 h were shown as follow: εr = 12.25, Qf = 46,320 GHz, τf = − 35.3 ppm/°C.



中文翻译:

非化学计量学对Ba 1 + x Cu 2 V 2 O 8(x = 0.15,0.25,0.35)陶瓷的微观结构和微波介电性能的影响

 使用常规的固态反应烧结法合成Ba 1+ x Cu 2 V 2 O 8x = 0.15、0.25、0.35)陶瓷。研究了非化学计量对Ba 1+ x Cu 2 V 2 O 8x  = 0.15、0.25、0.35)陶瓷的结晶相,致密烧结,微观形貌和微波介电性能的影响。在 根据化学计量制备的样品(x = 1)中,只有BaCu 2 V 2 O 8的单晶相存在。Ba 2+离子的过量直接导致了新的Ba 2 V 2 O 7相的沉淀。使用EDS对元素组成的检测也证实了相组成的结果。SEM结果表明,随着Ba 2+离子含量的增加,陶瓷的微观结构变得疏松。根据化合物的通式计算理论微波介电性能。计算结果表明,Ba 2 V 2 O 7的析出相是影响陶瓷微波介电性能的主要因素。微波介电性能的测量结果与计算结果一致。巴的微波介电性能1.35的Cu 2 V 2 ö 8在725煅烧样品℃下6小时均表现如下:ε - [R  = 12.25,Q ˚F  = 46320千兆赫,τ ˚F = - 35.3 PPM /℃。

更新日期:2020-09-22
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