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Title: Correlation among far-infrared reflection modes, crystal structures and dielectric properties of Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}–CaTiO{sub 3} ceramics

Abstract

Highlights: • Crystal symmetry decreases with CT concentration from cubic to hexagonal structure. • Lattice constants as well as the ordered degree change with CT concentration. • Ordered structures turn from 1:1 to 1:2 ordering with change of crystal structures. • There is a correlation between FIR phonon modes and dielectric properties. • There is a correlation between FIR phonon modes and crystal structures. - Abstract: Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3} (BZN)–CaTiO{sub 3} (CT) microwave dielectric ceramics were synthesized at 1395 °C for 4 h using conventional solid-state sintering technique with different CT contents. The ceramics were characterized by X-ray diffraction (XRD) and far-infrared reflection (FIR) spectroscopy to evaluate correlations among crystal structures, dielectric properties, and infrared modes. XRD results showed that crystal symmetry decreased with increased CT concentration from cubic to hexagonal structure, and lattice constants and ordered degree changed accordingly. Ordered phases transformed from 1:1 to 1:2 ordered structure with crystal-structure change. FIR results demonstrated that two new IR active modes appeared at 300 cm{sup −1}, and another new mode appeared at 600 cm{sup −1} for the x ≥ 0.60 sample, which agreed with the change in crystal structures as confirmed by XRD results. Correlations between FIR modes andmore » dielectric properties were established.« less

Authors:
; ; ; ; ;
Publication Date:
OSTI Identifier:
22581467
Resource Type:
Journal Article
Journal Name:
Materials Research Bulletin
Additional Journal Information:
Journal Volume: 75; Other Information: Copyright (c) 2015 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0025-5408
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; ABSORPTION SPECTROSCOPY; BARIUM COMPOUNDS; CALCIUM COMPOUNDS; CERAMICS; COMPUTERIZED TOMOGRAPHY; CONCENTRATION RATIO; CORRELATIONS; CRYSTAL STRUCTURE; CRYSTALS; DIELECTRIC MATERIALS; DIELECTRIC PROPERTIES; INFRARED SPECTRA; LATTICE PARAMETERS; MICROWAVE RADIATION; NIOBATES; PHONONS; SINTERING; TITANATES; X-RAY DIFFRACTION; ZINC OXIDES

Citation Formats

Shi, Feng, Sun, Haiqing, Liu, Hongquan, Xu, Guogang, Wang, Jing, and Han, Ye. Correlation among far-infrared reflection modes, crystal structures and dielectric properties of Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}–CaTiO{sub 3} ceramics. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2015.11.036.
Shi, Feng, Sun, Haiqing, Liu, Hongquan, Xu, Guogang, Wang, Jing, & Han, Ye. Correlation among far-infrared reflection modes, crystal structures and dielectric properties of Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}–CaTiO{sub 3} ceramics. United States. https://doi.org/10.1016/J.MATERRESBULL.2015.11.036
Shi, Feng, Sun, Haiqing, Liu, Hongquan, Xu, Guogang, Wang, Jing, and Han, Ye. 2016. "Correlation among far-infrared reflection modes, crystal structures and dielectric properties of Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}–CaTiO{sub 3} ceramics". United States. https://doi.org/10.1016/J.MATERRESBULL.2015.11.036.
@article{osti_22581467,
title = {Correlation among far-infrared reflection modes, crystal structures and dielectric properties of Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3}–CaTiO{sub 3} ceramics},
author = {Shi, Feng and Sun, Haiqing and Liu, Hongquan and Xu, Guogang and Wang, Jing and Han, Ye},
abstractNote = {Highlights: • Crystal symmetry decreases with CT concentration from cubic to hexagonal structure. • Lattice constants as well as the ordered degree change with CT concentration. • Ordered structures turn from 1:1 to 1:2 ordering with change of crystal structures. • There is a correlation between FIR phonon modes and dielectric properties. • There is a correlation between FIR phonon modes and crystal structures. - Abstract: Ba(Zn{sub 1/3}Nb{sub 2/3})O{sub 3} (BZN)–CaTiO{sub 3} (CT) microwave dielectric ceramics were synthesized at 1395 °C for 4 h using conventional solid-state sintering technique with different CT contents. The ceramics were characterized by X-ray diffraction (XRD) and far-infrared reflection (FIR) spectroscopy to evaluate correlations among crystal structures, dielectric properties, and infrared modes. XRD results showed that crystal symmetry decreased with increased CT concentration from cubic to hexagonal structure, and lattice constants and ordered degree changed accordingly. Ordered phases transformed from 1:1 to 1:2 ordered structure with crystal-structure change. FIR results demonstrated that two new IR active modes appeared at 300 cm{sup −1}, and another new mode appeared at 600 cm{sup −1} for the x ≥ 0.60 sample, which agreed with the change in crystal structures as confirmed by XRD results. Correlations between FIR modes and dielectric properties were established.},
doi = {10.1016/J.MATERRESBULL.2015.11.036},
url = {https://www.osti.gov/biblio/22581467}, journal = {Materials Research Bulletin},
issn = {0025-5408},
number = ,
volume = 75,
place = {United States},
year = {Tue Mar 15 00:00:00 EDT 2016},
month = {Tue Mar 15 00:00:00 EDT 2016}
}