摘要：以Co(NO3)2·6H2O和Fe(NO3)3·9H2O为原料用化学合成法制备了铁酸钴粉体(简称CFO)。通过溶胶-凝胶工艺在其表面包覆二氧化锆扩散阻挡层。用锗酸铅为低温烧结助剂降低锆钛酸铅镧(PLZT)的烧结温度。用共烧工艺制备了CFO/PLZT复合多铁性陶瓷。研究了CFO含量、烧结温度对陶瓷的晶相结构、微观形貌，压电、介电、铁电和磁电性能的影响。结果表明: CFO/PLZT复合材料的介电常数、压电应变常数随着CFO含量的增大而减小，介电损耗随着CFO的含量的增大而增大。当CFO:PLZT=1:9时，1050℃下烧结的复合材料的压电应变常数、体积电阻率、介电常数、介电损耗、居里温度、磁电转换系数为分别为26×10-12C/N、1.42×105M·cm、671.8、0.1394、245℃、127.32mV/(cm·Oe)。
关键词：溶胶-凝胶工艺；铁酸钴；低温烧结；复合多铁性陶瓷
Abstract:Using Co(NO3)2·6H2O and Fe(NO3)3·9H2O as precursors, the cobalt ferrite (CFO) powder was prepared via chemical synthesis. ZrO2 diffusion barrier layer was coated on the surface of the CFO powder via sol-gel methods. The lead germinate was used as sintering additives to decreasing the sintering temperature of the PLZT. The effect of the CFO content and sintering temperature on the crystalline structure, micro-morphology, piezoelectric, dielectric, ferroelectric and electro-magnetic properties were investigated. The results showed that the dielectric constant and piezoelectric constant of the CFO/PLZT-PGO composites decreased with the increasing of CFO content, but the dielectric loss increased reversely. The d33, , r, tan, Tc and magneto-electric transition efficient of the composites (CFO:PLZT=1:9) which were sintered at 1050℃ were found to be 2610-12 C/N, 1.42105 M·cm, 671.8, 0.1394, 245 ℃, 127.32 mV/(cm·Oe), respectively.
Keywords: Sol-Gel process; CoFe2O4; low temperature sintering; multiferroic composite ceramics
