Chin. Phys. Lett.  2008, Vol. 25 Issue (12): 4421-4424    DOI:
Original Articles |
Optical Transmittance and Band Gap of Ferroelectric BaTi2O5 Bulk Glass
Javed Ahmad1,2, Hidetoshi Minami1, Sher Alam3, Jianding Yu4, Yasutomo Arai4, Hiromoto Uwe1
1Institute of Materials Science, University of Tsukuba, Tsukuba, Ibaraki 305-8573, Japan2Department of Physics, Bahauddin Zakariya University, Multan 60800, Pakistan3Advanced Materials Laboratory, National Institute for Materials Science (NIMS), Tsukuba, Ibaraki 305-0044, Japan4Japan Aerospace Exploration Agency, ISS Science Project Office, 2-1-1 Sengen, Tsukuba, Ibaraki 305-8505, Japan
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Javed Ahmad, Hidetoshi Minami, Sher Alam et al  2008 Chin. Phys. Lett. 25 4421-4424
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Abstract

Optical transmittance and reflectance on ferroelectric BaTi2O5 glasses prepared recently by a containerless synthesis technique are measured at room temperature in the wavelength range 190-800nm. The fundamental absorption edge located around 340nm demonstrates the colourless and transparent character of the glass. The optical band gap of 3.32eV has been estimated. The tail of the optical absorption near the fundamental absorption edge is found to follow the Urbach rule. Our analysis of the experimental spectra supports an indirect allowed interband transition between the valence band formed by O-2p orbitals and the conduction band formed by Ti-3d orbitals.

Keywords: 78.55.Qr      78.40.-q      78.20.Ci     
Received: 24 September 2008      Published: 27 November 2008
PACS:  78.55.Qr (Amorphous materials; glasses and other disordered solids)  
  78.40.-q (Absorption and reflection spectra: visible and ultraviolet)  
  78.20.Ci (Optical constants (including refractive index, complex dielectric constant, absorption, reflection and transmission coefficients, emissivity))  
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https://cpl.iphy.ac.cn/       OR      https://cpl.iphy.ac.cn/Y2008/V25/I12/04421
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Articles by authors
Javed Ahmad
Hidetoshi Minami
Sher Alam
Jianding Yu
Yasutomo Arai
Hiromoto Uwe
[1] Yu J, Arai Y, Masaki T, Ishikawa T, Yoda S, Kohara S,Taniguchi H, Itoh M and Kuroiwa Y 2008 Chem. Mater. 182167
[2] Akishige Y, Fukano K and Shigematsu H 2003 Jpn. J.Appl. Phys. 42 L946
[3] Akashi T, Wata H and Goto T 2003 Method. Mater.Trans. 44 802
[4] Akishige Y, Fukano K and Shigematsu H 2004 J.Electroceram. 13 561
[5] Taniguchi H, Yu J, Arai Y, Fu D, Yagi T and Itoh M 2008 Mat. Sci. Eng. B 148 48 6] Yu J, Paradis P F, Ishikawa T, Yoda S, Saita Y, Itoh M andKano F 2004 Chem. Mater. 16 3973
[7] Yu J, Paradis P F, Ishikawa T and Yoda S, 2004 Appl.Phys. Lett. 85 2899
[8] Ahmad J, Nishio T and Uwe H 2003 Physica C 388--389 455
[9] Ahmad J and Uwe H 2005 Phys. Rev. B 72 125103
[10] Nishio T, Ahmad J and Uwe H 2005 Phys. Rev. Lett. 95 176403
[11] Mott N F and Davis E A 1979 Electronic Processes inNon-Crystalline Materials (Oxford: Clarendon) p272
[12] Tauc J, Grigorovici R and Vancu A 1966 Phys. StatusSolidi 15 627
[13] Urbach F 1953 Phys. Rev. 92 1324
[14] Tauc J 1970 Optical Properties of Solids(Amsterdam: North Holland) p 123
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