Structural investigation of oxygen stoichiometry during thermocycles in PMN-28PT

JOURNAL OF ALLOYS AND COMPOUNDS

卷:784

Article

Sabarou, Hooman^1,2  Drozd, Vadym²  Awadallah, Osama²  Durygin, Andriy²  Darvish, Shadi^1,2  Huang, Dehua³  Zhong, Yu^1,2 

[1] Worcester Polytech Inst, Dept Mech Engn, Worcester, MA 01609 USA

[2] Florida Int Univ, Ctr Study Matter Extreme Condit, Dept Mech & Mat Engn, Miami, FL 33199 USA

[3] Navy Undersea Warfare Ctr, 1176 Howell St, Newport, RI 02841 USA

关键词: Oxide materials;    Crystal structure;    Phase transitions;    Thermodynamic properties;    Thermal analysis;   

DOI  :  10.1016/j.jallcom.2018.12.358

来源: Elsevier

【 摘 要 】

The current research focuses on the role of oxygen partial pressure on structure and phase transitions of (1-x)Pb(Mg1/3Nb2/3)O3-xPbTiO3 with x = 0.28 (PMN-28PT). The changes in oxygen content have been traced through weight gain/loss during 160 cycles between 250 and 300 degrees C. The structural phase transitions have been investigated by in-situ high temperature powder X-ray diffraction and high temperature Raman spectroscopy. The variations in oxygen content in PMN-28PT result in structural changes and have a significant effect on electrical impedance. It is suggested that bonding between oxygen and Ti and Pb atoms in the perovskite structure of PMN-28PT can be controlled by low oxygen partial pressure heat treatment. (C) 2019 Elsevier B.V. All rights reserved.

【 授权许可】

Free