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Kongjun Zhu,Jinhao Qiu,Hongli Ji,Yuansheng Chen 한양대학교 세라믹연구소 2010 Journal of Ceramic Processing Research Vol.11 No.3
In this study, three types of BaTiO3 powder with different particle sizes synthesized by a hydrothermal method were used to fabricate the lead-free barium titanate piezoelectric ceramics. The BaTiO3 ceramics from these three types of BaTiO3 powders were sintered at different temperatures (1100 and 1150 oC) using a microwave sintering method, and their piezoelectric properties were investigated and compared. The results indicate that all The BaTiO3 piezoelectric ceramics exhibit higher d33value (above 330 pC/N, the highest is about 370 pC/N). The reasons were also investigated by comparing the properties of the three types of BaTiO3 powders, sintering temperature and method.
High-temperature-mixing hydrothermal synthesis of ZnO nanocrystals with wide growth window
Jun Wen,Yonghong Hu,Kongjun Zhu,Yufang Li,Jizhong Song 한국물리학회 2014 Current Applied Physics Vol.14 No.3
High-quality and controllable growth of nanocrystals (NCs) have been attracting great attention. Here, a high-temperature-mixing hydrothermal (HTMH) method was designed to synthesize ZnO NCs with high crystallinity and narrow size distribution in a wide growth window. Compared with conventional hydrothermal (CH) growth, zinc source and alkali precursors were intentionally separated in temperaturerising stage and permitted to mix at the starting of heat preservation stage of HTMH growth. Highly crystalline ZnO NCs with uniform spherical morphology can be formed at alkali concentration and temperature windows as wide as 0.1e0.5 M and 160e200 C, respectively. However, the products via CH method have much larger changes in not only morphology but also size. These results demonstrated that the high-temperature-mixing reaction greatly facilitates nucleation but depresses grain growth. Considering the simplicity and reproducibility, such HTMH method could have wide potentials for the fabrication of various functional nanocrystals.