【作者】 王海燕； 熊小敏； 张进修；

【Author】 WANG Hai-yan XIONG Xiao-min ZHANG Jin-xiu (State Key Laboratory of Optoelectronic Materials and Technologies,School of Physics & Engineering,Sun Yat-Sen University,Guangzhou 510275)

【机构】 中山大学物理科学与工程技术学院光电材料与技术国家重点实验室；

【摘要】 在空冷的四方相钛酸锶钡陶瓷中观测到介电损耗—温度关系对测量频率依赖关系的分岔现象。即高频测量时,出现单一的损耗峰,随着测量频率的降低,单一的损耗峰分裂成两个损耗峰,该现象只在升温时出现。内耗在相应温区亦在升温时出现两个相变型内耗峰。由于该温区内的畴界运动不可能引起相变,该相变分岔现象可能是温度变化时,空冷样品中氧缺位组态变化所致。更多还原

【Abstract】 Frequency effect of dielectric loss of air-cooled Ba_0.8Sr_0.2TiO₃ ceramics is studied in the tetragonal temperature range of 15～50℃.A new bifurcation phenomenon of dielectric loss peak is observed while the dielectric loss D is measured as a function of temperature,i.e.a single D-T peak is observed with measuring frequency of 100 KHz,but as decrease the measuring frequency,the single peak split to two D-T peaks.Two phase transition-type internal peaks are also observed in the same temperature range and the possible mechanism is discussed.更多还原