为了降低CaCu3Ti4O12陶瓷的介电损耗,保持高介电常数,采用共沉淀法制备CaCu3Ti4O12陶瓷.研究了前驱粉料的热分解过程、煅烧后粉料的物相结构、陶瓷的显微结构和介电性能,并考察了Ca、Cu混合溶液pH值对CaCu3Ti4O12陶瓷性能的影响.结果表明:当Ca、Cu混合溶液pH值为5.1时,制备的CaCu3Ti4O12陶瓷介电损耗最低,而且能保持高介电常数.在室温下,频率为1kHz时,介电常数为1.4×104,介电损耗为0.037.通过对陶瓷性能对比,发现共沉淀反应中各元素的沉淀比例,陶瓷的微观结构和介电性能均受该pH值的影响.因此,Ca、Cu混合溶液的pH值对降低CaCu3Ti4O12陶瓷介电损耗、保持高介电常数影响很大.
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