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Journal of Applied Physics : Raman spectra analysis for Ca(B1/3'B2/3.)O3-based complex perovskite ceramics

By M. S. Fu, X. Q. Liu, and X. M. Chen

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Book Id: WPLBN0002169425
Format Type: PDF eBook :
File Size: Serial Publication
Reproduction Date: 19 November 2008

Title: Journal of Applied Physics : Raman spectra analysis for Ca(B1/3'B2/3.)O3-based complex perovskite ceramics  
Author: M. S. Fu, X. Q. Liu, and X. M. Chen
Volume: Issue : November 2008
Language: English
Subject: Science, Physics, Natural Science
Collections: Periodicals: Journal and Magazine Collection (Contemporary), Journal of Applied Physics Collection
Historic
Publication Date:
Publisher: American Institute of Physics

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Fu, X. Q. Liu, And X. M. Che, M. S. (n.d.). Journal of Applied Physics : Raman spectra analysis for Ca(B1/3'B2/3.)O3-based complex perovskite ceramics. Retrieved from http://hawaiilibrary.net/


Description
Description: Ca[(Mg1/3Ta2/3)1−xTix]O3 (hereafter denoted as CMTT) and (Ca1−0.39xNd0.26x) [(Mg1/3Nb2/3)1−xTix]O3 (hereafter denoted as CNMNT) complex perovskite ceramics were studied by Raman spectroscopy combined with Rietveld analysis. The crystal structures changed from monoclinic structure with P21/c space group to orthorhombic structure with Pbnm space group for both systems. The main structure of the two systems was orthorhombic and the characteristic modes for the orthorhombic structure with space group Pbnm could be found in all the compositions. Raman modes at around 408 cm−1 could only be found for compositions with 1:2 long range cation ordering while modes at around 800 cm−1 could be found for all the compositions in both systems. They were concluded to be correlated with the 1:2 long range cation ordering and different short range cation ordering, respectively. Two Ag modes at around 800 cm−1 represented for 1:2 and 1:1 short range cation ordering were observed for CMTT ceramics with x = 0.1–0.6 while only 1:2 short range Ag mode was observed in all compositions for CNMNT ceramics. The weak A-O hybridization was considered to be the reason for the absence of the 1:1 short range cation ordering. The short range cation ordering was suggested to be appreciably beneficial to the Qf value.

 

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