水热法制备球形Ba(Mg_(1/3)Ta_(2/3))O_(3)纳米粉体  

Synthesis of Spheroid Ba(Mg_(1/3)Ta_(2/3))O_(3)Nano-Powders by Hydrothermal Method

作　　者：左传东 万京其 韦柏旭 杨再稳 左传歌 麻朝阳 ZUO Chuandong;WAN Jingqi;WEI Boxu;YANG Zaiwen;ZUO Chuange;MA Chaoyang(Zhongke Haoye Dongguan Material Technology Co.,Ltd.,Dongguan 523808,China;Songshan Lake Materials Laboratory,Dongguan 523808,China)

机构地区：[1]中科皓烨(东莞)材料科技有限责任公司,东莞523808 [2]松山湖材料实验室,东莞523808

出　　处：《硅酸盐通报》2024年第12期4563-4570,共8页Bulletin of the Chinese Ceramic Society

摘　　要：钽镁酸钡(Ba(Mg_(1/3)Ta_(2/3))O_(3),BMT)陶瓷具有优异的微波介电性能,而制备出高质量微波介电陶瓷的关键在于合成出晶相纯、粒度均匀、分散性好的BMT纳米粉体。以氧化钽、硝酸镁与硝酸钡为原料,以KOH溶液和异丙醇为溶剂,采用水热法制备BMT纳米粉体。通过X射线衍射仪和扫描电子显微镜表征产物的晶体结构、显微形貌和颗粒尺寸,探讨KOH浓度、反应温度、反应时间对BMT粉体的影响;通过差热分析,研究煅烧温度对BMT粉体的影响。结果表明,当KOH浓度为2 mol/L、反应温度为200℃、反应时间为24 h、冷冻干燥后煅烧温度为1000℃时,制得的BMT纳米颗粒呈类球形,分散均匀,基本无团聚现象,颗粒直径约为100 nm。该研究成果对水热合成BMT纳米粉体具有一定的指导意义。Barium magnesium tantalate(Ba(Mg_(1/3)Ta_(2/3))O_(3),BMT)ceramics has excellent microwave dielectric properties.It’s the key point to synthesize BMT nano-powders with well-crystallized,uniform grain,good dispersion for perfect microwave dielectric ceramics.BMT nano-powders were prepared by hydrothermal method using tantalum oxide,magnesium nitrate,and barium nitrate as raw materials,KOH solution and isopropyl alcohol as solvents.The crystal structure,morphology,and particle size of the product were characterized by X-ray diffractometer and scanning electron microscope.The effects of KOH concentration,reaction temperature,and reaction time on BMT powders were investigated.The effect of calcination temperature on BMT powders was studied by differential thermal analysis.The results show that the optimum conditions for the synthesis of BMT nano-powders are KOH concentration 2 mol/L,reaction temperature 200℃,reaction time 24 h and calcination temperature 1000℃after freezing-drying.Under this condition,the obtained BMT nano-powders particles are spherically dispersed,and the particle diameter is about 100 nm.This method can be used as a reference for hydrothermal synthesis of BMT nano-powders.

关 键 词：陶瓷 Ba(Mg_(1/3)Ta_(2/3))O_(3) 纳米粉体 水热法 冷冻干燥 球形 煅烧温度 

分 类 号：TQ174[化学工程—陶瓷工业]