Influence of bismuth additives on the dielectric properties of Pb(Fe2/3W1/3)0.7Ti0.3O3 ceramics

Autor:	Hsiau Hsian Nien, Cheng Shong Hong, Sheng-Yuan Chu, Chun Hsien Lin, Hsiu Hsien Su
Rok vydání:	2015
Předmět:	Phase transition Materials science Mechanical Engineering Metals and Alloys Analytical chemistry Mineralogy chemistry.chemical_element Dielectric Ferroelectricity Grain size Ion Bismuth Grain growth chemistry Mechanics of Materials visual_art Materials Chemistry visual_art.visual_art_medium Ceramic
Zdroj:	Journal of Alloys and Compounds. 650:584-591
ISSN:	0925-8388
DOI:	10.1016/j.jallcom.2015.07.091
Popis:	In this study, the effects of bismuth additives are investigated based on the dielectric properties by the empirical law and the order–disorder model for the Pb(Fe2/3W1/3)0.7Ti0.3O3–x wt.% Bi2O3 ceramics. The grain size initially increased and the diffused phase transition property initially decreased at x = 0.25 wt.% and then these properties reversed. In addition, the space charge polarization is weakened and then reinforced when the amount of bismuth additives increases. According to these experimental results and the model fitting results, it is concluded that bismuth additives can induce the random-site 1:1 order and change the dielectric properties from relaxor ferroelectric to normal ferroelectric by substituting bismuth ions for the lead vacancies. Furthermore, excess amounts of bismuth additives impede the grain growth and change the dielectric properties from normal ferroelectric to relaxor ferroelectric.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::f197cd45ad7e4838cef03792cd677ffb https://doi.org/10.1016/j.jallcom.2015.07.091 Zobrazit plný text záznamu Full Text from ScienceDirect