Local structure and hybridization states in Ba0.9Ca0.1Ti1 xZrxO3 ceramic compounds: correlation with a normal or relaxor ferroelectric character.

• Autor(es): Mastelaro, Valmor Roberto ; Favarim, Higor Rogerio ; Mesquita, Alexandre ; Michalowicz, A. ; Moscovici, J. ; Eiras, J. A.
• Data: 2015
• Origem: Oasisbr
• Assunto(s): Ferroeletrics; Relaxors; Lead free; Hybridization
• Tipo de Documento: Artigo científico
• Idioma: Inglês

Descrição

This paper reports on a multi-edge X-ray absorption analysis to elucidate how the substitution of Ti4+ by Zr4+ ions acts on the local order structure and on the O 2p hybridization states of Ba0.9Ca0.1Ti1_xZrxO3 (BCZT) lead-free ceramic compounds, inducing a ferroelectric evolution from a normal to a relaxor character. Ti, Ba, Zr and O X-ray absorption spectra were measured to probe the local and electronic structure of BCZT samples that exhibit a normal (x < 0.18) or relaxor (xP 0.18) ferroelectric character. X-ray absorption near edge structure results show that the local symmetry and distortion of TiO6, ZrO6 and BaO12 units are not significantly affected by the Ti/Zr ratio, the ferroelectric character or the long-range order symmetry. The assignment of the ab initio density of states associated with the O K-edge enabled a correlation between the decrease in the hybridization between O 2p and Ti 3d states and the ferroelectric character evolution of the BCZT samples. The hybridization states in the ferroelectric relaxor samples exhibit a more symmetric spatial configuration, as occurs with long-range symmetry.