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Title: Structural and optical study of γ –BIMEVOX; ME: Ba{sup 2+} and Sr{sup 2+}

Abstract

Bismuth oxide based compounds, such as Bi{sub 4}V{sub 2}O{sub 11-δ} (BIVOX), exhibit Aurivillus type of interleaving arrangement of (Bi{sub 2}O{sub 2}){sup 2+} and (VO{sub 3}□{sub 0.5}){sup 2-} (□: oxygen vacancies). Bi{sub 4}V{sub 2}O{sub 11-δ,} is known to have three kinds of temperature dependent interconvertible polymorphs α (monoclinic), β (orthorhombic) and γ (tetragonal). Out of all the three phases, the γ – phase is highly disordered and hence, is the most conductive one which can be stabilized by proper lower valence cation (ME) doping at V site. Bi{sub 4}V{sub 1.90}ME{sub 0.20}O{sub 11-δ} (ME: Ba{sup 2+} and Sr{sup 2+}) were prepared via splat quenching technique. The required compositions were melted at 1250 °C in an electric furnace. The as quenched samples were sintered at 800 °C for 12 hours (h). The formed phases were analyzed using X-ray diffraction on quenched and sintered samples, the peak at 32{sup °} is found to be singlet in all the samples which confirms the presence of γ-phase. Hence, the stabilization of γ-phase with tetragonal structure was found to have taken place with doping and quenching. These samples are also studied by FT-IR and UV/vis spectroscopy to investigate the effect of dopants on structure and band gapsmore » respectively.« less

Authors:
;  [1]
  1. School of Physics and Materials Science, Thapar University, Patiala (India)
Publication Date:
OSTI Identifier:
22391764
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1661; Journal Issue: 1; Conference: ICCMP 2014: International Conference on Condensed Matter Physics 2014, Shimla (India), 4-6 Nov 2014; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ABSORPTION SPECTROSCOPY; BARIUM IONS; BISMUTH OXIDES; CATIONS; DOPED MATERIALS; ELECTRIC FURNACES; FOURIER TRANSFORMATION; INFRARED SPECTRA; MONOCLINIC LATTICES; ORTHORHOMBIC LATTICES; QUENCHING; STRONTIUM IONS; TEMPERATURE DEPENDENCE; VACANCIES; VALENCE; VANADATES; X-RAY DIFFRACTION

Citation Formats

Gupta, Sakshi, E-mail: Sakshi.gupta@thapar.edu, and Singh, K., E-mail: kusingh@thapar.edu. Structural and optical study of γ –BIMEVOX; ME: Ba{sup 2+} and Sr{sup 2+}. United States: N. p., 2015. Web. doi:10.1063/1.4915452.
Gupta, Sakshi, E-mail: Sakshi.gupta@thapar.edu, & Singh, K., E-mail: kusingh@thapar.edu. Structural and optical study of γ –BIMEVOX; ME: Ba{sup 2+} and Sr{sup 2+}. United States. doi:10.1063/1.4915452.
Gupta, Sakshi, E-mail: Sakshi.gupta@thapar.edu, and Singh, K., E-mail: kusingh@thapar.edu. Fri . "Structural and optical study of γ –BIMEVOX; ME: Ba{sup 2+} and Sr{sup 2+}". United States. doi:10.1063/1.4915452.
@article{osti_22391764,
title = {Structural and optical study of γ –BIMEVOX; ME: Ba{sup 2+} and Sr{sup 2+}},
author = {Gupta, Sakshi, E-mail: Sakshi.gupta@thapar.edu and Singh, K., E-mail: kusingh@thapar.edu},
abstractNote = {Bismuth oxide based compounds, such as Bi{sub 4}V{sub 2}O{sub 11-δ} (BIVOX), exhibit Aurivillus type of interleaving arrangement of (Bi{sub 2}O{sub 2}){sup 2+} and (VO{sub 3}□{sub 0.5}){sup 2-} (□: oxygen vacancies). Bi{sub 4}V{sub 2}O{sub 11-δ,} is known to have three kinds of temperature dependent interconvertible polymorphs α (monoclinic), β (orthorhombic) and γ (tetragonal). Out of all the three phases, the γ – phase is highly disordered and hence, is the most conductive one which can be stabilized by proper lower valence cation (ME) doping at V site. Bi{sub 4}V{sub 1.90}ME{sub 0.20}O{sub 11-δ} (ME: Ba{sup 2+} and Sr{sup 2+}) were prepared via splat quenching technique. The required compositions were melted at 1250 °C in an electric furnace. The as quenched samples were sintered at 800 °C for 12 hours (h). The formed phases were analyzed using X-ray diffraction on quenched and sintered samples, the peak at 32{sup °} is found to be singlet in all the samples which confirms the presence of γ-phase. Hence, the stabilization of γ-phase with tetragonal structure was found to have taken place with doping and quenching. These samples are also studied by FT-IR and UV/vis spectroscopy to investigate the effect of dopants on structure and band gaps respectively.},
doi = {10.1063/1.4915452},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1661,
place = {United States},
year = {2015},
month = {5}
}