Giant dielectric tunability properties of Sr and Sb co-doped La₂NiMnO₆ ceramics induced by extrinsic contribution.

Cao, Zhenzhu; Li, Zhi; Gao, Yanfang; Liu, Jinrong; Ruan, Xuezheng; Fang, Minghao

La2- xSr xNiMn1- xSb xO6 ( x = 0, 0.08, 0.3) ceramics were prepared by a gel combustion method. Structural, dielectric, and dielectric tunable properties were systematically investigated. A phase transition from mixed monoclinic and rhombohedral phases to monoclinic phase occurs as Sr and Sb contents increase. Impedance and frequency dependence of dielectric constant have been employed to examine the extrinsic contribution to the dielectric properties. Results reveal that the electrode effect has an important influence on the giant dielectric permittivity and dielectric tunability around room temperature.

DIELECTRIC properties; PHASE transitions; CRYSTAL structure; CHARGE exchange; CERAMICS; X-ray diffraction

Physica Status Solidi. A: Applications & Materials Science, 2014, Vol 211, Issue 5, p1207

1862-6300

Academic Journal

10.1002/pssa.201330529