文献类型：期刊文献

英文题名：Unveiling the effect of phase separation on crystallization of calcium borosilicate glass-ceramics

作者：Yang, Rui[1];Jia, Qingchao[1];Zhang, Liangzhu[1];Chen, Chen[2];Yu, Jiayan[2];Zeng, Huidan[1];Luo, Xiongke[2]

机构：[1]East China Univ Sci & Technol, Sch Mat Sci & Engn, Shanghai 200237, Peoples R China;[2]Shanghai Zenfocus Semicond Technol Co Ltd, Shanghai 201206, Peoples R China

年份：2024

卷号：50

期号：7

起止页码：11003

外文期刊名：CERAMICS INTERNATIONAL

收录：;EI(收录号：20240315381557);WOS:【SCI-EXPANDED(收录号:WOS:001198060500001)】；

基金：The authors are very grateful for the financial support of the National Natural Science Foundation of China for Innovative Research Groups (nos. 52072122 and 52272001) and the technical support of Shanghai Zenfocus Semiconductor Technology Co., Ltd.

语种：英文

外文关键词：CaO-B2O3-SiO2; Phase separation; Glass-ceramic; Crystallization

摘要：The CaO-B2O3-SiO2(CBS) glass-ceramics with low sintering temperature and good microwave dielectric properties have been applied on the famous commercial low temperature co-fired ceramics (LTCC) Tape for passivation substrate materials for 5G/6G technology. However, the phase separation and its relationship with the crystallization is rarely studied but extremely important for understanding and designing the high-performance CBS glass-ceramics. Herein, we find that the phase separation type of CBS glass-ceramics changes from metastable immiscibility to stable immiscibility with the increase of B2O3 content. In the metastable immiscible glass-ceramics, three phases are observed, including continuous borate-rich and silicate-rich phases as well as spherical silicate-rich phases. In the stable immiscible glass-ceramics, the silicate-rich phases transform into petal-liked shapes. beta-CaSiO3 nuclei are formed in fractions with BO3/SiO4 equaling to 0.56. Notably the beta-CaSiO3 nucleus do not grow after heat treatment at 850 degrees C, but grow at higher temperatures. Phase separation hinders the precipitation of beta-CaSiO3 and promoted the formation of CaB2O4 and SiO2. In addition, interfacial defects caused by phase separation alter the crystal barrier and promote the formation of alpha-CaSiO3. However, alpha-CaSiO3 dissolves at 1000 degrees C and may provide Ca2+ cations together with the borate-rich phase for the regrowth of beta-CaSiO3. Our work provides another perspective for understanding the effects of phase separation on crystallization in CBS glass-ceramics, contributing to improving the microwave dielectric performance by structural design.