CAJ | 학술논문

采用sol-gel法制备了Y~(3+)掺杂Ba_(0.90)Sr_(0.08)Ca_(0.02)TiO_3(BSCT)纳米粉体及细晶陶瓷.通过TG-DTG、XRD、SEM和TEM对样品结构及形貌进行了表征,并测试了陶瓷的介电性能.研究表明,Y~(3+)掺杂BSCT纳米粉体主要为立方相BaTiO_3,烧结后陶瓷晶粒尺寸在0.68～2.24 μm可控,Y~(3+)掺杂可以抑制陶瓷晶粒的生长,使陶瓷的t_C向低温方向移动.随Y~(3+)掺杂量的增大,陶瓷的介电温谱ε_r - t趋于平缓,当x(Y~(3+))为7.0%时,陶瓷的室温ε_r大幅度提高到9 176.
채용sol-gel법제비료Y~(3+)참잡Ba_(0.90)Sr_(0.08)Ca_(0.02)TiO_3(BSCT)납미분체급세정도자.통과TG-DTG、XRD、SEM화TEM대양품결구급형모진행료표정,병측시료도자적개전성능.연구표명,Y~(3+)참잡BSCT납미분체주요위립방상BaTiO_3,소결후도자정립척촌재0.68～2.24 μm가공,Y~(3+)참잡가이억제도자정립적생장,사도자적t_C향저온방향이동.수Y~(3+)참잡량적증대,도자적개전온보ε_r - t추우평완,당x(Y~(3+))위7.0%시,도자적실온ε_r대폭도제고도9 176.
Y~(3+)-doped Ba_(0.90)Sr_(0.08)Ca_(0.02)TiO_3(BSCT) nanopowders and fine-grained ceramics were prepared via a sol-gel method.The structure and morphology of samples were characterized by TG-DTG,XRD,SEM and TEM,and the dielectric properties of prepared ceramics were also measured.The results show that the prepared nanopowders were mainly composed of cubic BaTiO_3 phase.The grain size of prepared ceramics can be controlled between 0.68 μm and 2.24 μm.The grain growth of prepared ceramics can be inhibited and Curie temperature shifts to lower temperature.A relatively flat ε_r-t curve is obtained when the Y~(3+)-doping amount increases.ε_r of the ceramics at room temperature increases greatly to 9 176 when the x(Y~(3+)) is 7.0%.