弛豫铁电体 SrBaNbO（SBN52）在淬火和再加热时的结构变化。

Structural changes of relaxor ferroelectric SrBaNbO (SBN52) on quenching and reheating.

作者信息

Graetsch Heribert A

机构信息

Institut für Geologie, Mineralogie und Geophysik, Ruhr-Universität Bochum, Universitätsstrasse 150, Bochum, D-44801, Germany.

出版信息

Acta Crystallogr B Struct Sci Cryst Eng Mater. 2017 Oct 1;73(Pt 5):820-826. doi: 10.1107/S2052520617007880. Epub 2017 Sep 13.

DOI:10.1107/S2052520617007880

PMID:28980985

Abstract

Quenching of SrBaNbO (SBN52) from temperatures above 700°C causes small modifications in the strontium distribution over the large cation sites (Me1 and Me2), changed off-centre shifts of the Nb atoms and slightly increased modulation amplitudes. The higher disorder of cation incorporation can explain the enhanced ferroelectric properties. The quenched structural disorder can be healed by reheating followed by slow cooling. A change of the modulation dimension on quenching such as for CaBaNbO (CBN) mixed crystals was not observed.

摘要

将SrBaNbO（SBN52）从700°C以上的温度淬火会导致大阳离子位点（Me1和Me2）上锶分布的微小变化、铌原子离中心位移的改变以及调制幅度略有增加。阳离子掺入的更高无序度可以解释铁电性能的增强。淬火后的结构无序可以通过再加热然后缓慢冷却来消除。未观察到像CaBaNbO（CBN）混合晶体那样淬火时调制维度的变化。