Zr-Modified Pb(Mg1/3Nb2/3)O3 with a Long-Range Cation Order.

Authors :: Zhao, Xiaohui
Qu, Weiguo
Tan, Xiaoli
Source :: Journal of the American Ceramic Society; Sep2008, Vol. 91 Issue 9, p3031-3038, 8p, 2 Black and White Photographs, 2 Charts, 7 Graphs
Publication Year :: 2008
Abstract: The 1:1 structural order and B-site cation order in Pb(Mg<subscript>1/3</subscript>Nb<subscript>2/3</subscript>)O<subscript>3</subscript> ceramics was significantly enhanced by Zr<superscript>4+</superscript> substituting Nb<superscript>5+</superscript> according to the chemical formula Pb(Mg<subscript>1/3</subscript>Zr<subscript>2 x/3</subscript>Nb<subscript>2(1− x)/3</subscript>)O<subscript>3− x/3</subscript>. The enhanced structural and cation order was revealed by both X-ray diffraction and transmission electron microscopy. The increased charge difference and the introduced oxygen vacancies were suggested to account for the observed long-range cation order. Typical relaxor ferroelectric behavior was retained even in the ceramics with a high degree of cation order. [ABSTRACT FROM AUTHOR]