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朱孔军

教授 博士生导师

招生学科专业:
仪器科学与技术 -- 【招收博士、硕士研究生】 -- 航空学院
机械 -- 【招收博士、硕士研究生】 -- 航空学院
材料科学与工程 -- 【招收博士、硕士研究生】 -- 材料科学与技术学院
材料与化工 -- 【招收博士、硕士研究生】 -- 材料科学与技术学院

性别:男

毕业院校:日本国立高知大学

学历:日本国立高知大学

学位:理学博士学位

所在单位:航空学院

办公地点:明故宫校区A8-615

联系方式:13951847864

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Revealing the hydrothermal crystallization mechanism of ilmenite-type sodium niobate microplates: the roles of potassium ions

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所属单位:航空学院

发表刊物:CRYSTENGCOMM

关键字:MOLTEN-SALT SYNTHESIS PIEZOELECTRIC PROPERTIES PHOTOCATALYTIC ACTIVITY GRAIN-SIZE NANBO3 PARTICLES MORPHOLOGY EVOLUTION CERAMICS GROWTH

摘要:In this study, ilmenite-type NaNbO3 microplates were prepared by a facile surfactant-free method, using NaAc and KOH as a sodium resource and as a mineralizer, respectively. The effects of each reactant were identified, and the formation process and crystallization pathway of ilmenite-type NaNbO3 microplates were explored based on the phase constitution, microstructure and chemical compositional analysis. The indispensable roles of K ions, which participated in the formation of layered KNN-hydrate intermediates, were revealed. Ilmenite-type NaNbO3 microplates were formed by the dissolution of these intermediates and subsequent recrystallization into K-containing NaNbO3, followed by the ion-exchange between K and Na ions. Meanwhile excess K ions would hinder the release of K ions associated with the dissolution of intermediates, thus preventing the formation of ilmenite-type NaNbO3. Moreover, the morphological evolution of ilmenite-type NaNbO3 microplates from platelets to octahedra was interpreted in terms of their intrinsic structure and KOH concentration.

ISSN号:1466-8033

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发表时间:2017-10-28

合写作者:Gu, Qilin,Lu, Wanheng,Sun, Qiaomei,王经文,Liu, Jinsong,Zhang, Jianhui,Zeng, Kaiyang,Wang, John

通讯作者:朱孔军,Zhang, Jianhui,朱孔军

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