复合体材料CuFe_2O_4-Pb(Mg_(1/3)Nb_(2/3))O_3的内耗和介电损耗  

INTERNAL FRICTION AND DIELECTRIC PROPERTIES OF CuFe2O4-Pb(Mg1/3Nb2/3)O3 COMPOSITES

作　　者：李伟[1] 宋春花[1] 包鹏[1] 马骏[1] 朱劲松[1] 王业宁[1] 

机构地区：[1]南京大学物理系固体微结构国家重点实验室,南京210093

出　　处：《金属学报》2003年第11期1197-1200,共4页Acta Metallurgica Sinica

基　　金：国家自然科学基金基目90207027;国家重点基础研究发展规划项目2002CB613300资助

摘　　要：用传统的固相反应方法制备了CuFe2O4-Pb(Mg1/3Nb2/3)O3复合体材料陶瓷.用X射线衍射确定了复合体材料中各相的存在.用双端振动簧法研究了样品在-200-400℃的音频内耗谱,在37.6℃发现一个很大的内耗峰P1,并伴随着约9％的模量的软化,表明了相变的存在.在室温下,测量了介电常数ε’和介电损耗tanδ随频率变化的关系;同时,测量了复合体材料的介电常数和介电损耗随温度的变化关系,进一步验证P1峰由立方到四方的相变引起.最后给出样品的磁滞回线.CuFe2O4-Pb(Mg1/3Nb2/3)O-3 composites were prepared using conventional solid state reaction method. The presence of both phases in the composites was confirmed by X-ray diffraction. The internal friction was measured using the vibrating reed method from -200-400 degreesC at kilohertz frequency, an internal friction peak was observed around 37.6 degreesC, accompanied with an about 9% modulus softening, which reveals a phase transition. Variations of dielectric constant and loss tangent with frequency and temperature under different frequencies were studied, further confirmed the peak P-1 is related to a phase transition (tetragonal to cubic). Magnetic hysteresis loops of the samples were also given out.

关 键 词：磁电效应 内耗 介电常数 

分 类 号：O469[理学—凝聚态物理] O482.1[理学—电子物理学]