Abstract
Glasses with composition (70 − x) B2O3·15Bi2O3·15LiF·xNb2O5 with x = 0–1.0 mol% were prepared by conventional glass-melting technique. The molar volume V m values decrease and the glass transition temperatures T g increase with increase of Nb2O5 content up to 0.2 mol%, which indicates that Nb5+ ions act as a glass former. Beyond 0.2 mol% Nb2O5 the V m increases and the T g decreases, which suggests that Nb5+ ions act as a glass modifier. The FTIR spectra suggest that Nb5+ ions are incorporated into the glass network as NbO6 octahedra, substituting BO4 groups. The temperature dependence of the dc conductivity follows the Greaves variable range hopping model below 454 K, and follows the small polaron hopping model at temperatures >454 K. σ dc, σ ac conductivity and dielectric constant (ε) decrease and activation energy for dc conduction ΔE dc which increases with increasing Nb2O5 content up to 0.2 mol%, whereas σ dc, σ ac and (ε) increase and ΔE dc decreases with increasing Nb2O5 content beyond 0.2 mol%. The impedance spectroscopy shows a single semicircle or arcs which indicate only the ionic conduction mechanism. The electric modulus formalism indicates that the conductivity relaxation is occurring at different frequencies exhibit temperature-independent dynamical process. The (FWHM) of the normalized modulus increases with increase in Nb2O5 content suggesting that the distribution of relaxation times is associated with the charge carriers Li+ or F− ions in the glass network.
Similar content being viewed by others
References
Venkataraman B, Varma K (2006) Opt Mater 28(12):1423:1431
Baia L, Stefan R, Kiefer Popp J, Simon S (2002) J Non-Cryst Solids 303:379
Fragoso W, Donega de M, Longo RL (2005) J Non-Cryst Solids 351:3121
Krogh-Moe (1962) J Phys Chem Glas 3:101
Lorosch J, Couzi M, Pelovz J, Vacher R, Lavascur A (1984) J Non-Cryst Solids 69:1
WatanabeT NanbaT, Miura Y (2002) J Non-Cryst Solids 297:73
Agarwal A, Sheoran A, Sanghi S, Bhatnagar V, Gupta S, Arora M (2010) Spectrochim Acta Part A 75:964
Sanghia S, Rani S, Agarwal A, Bhatnagar V (2010) Mater Chem Phys 120:381
Rani S, Sanghi S, Agarwal A, Khasa S (2009) International seminar on science and technology of glass materials. IOP Conf Ser 2 012041
Kulkarni A, Lunkenheimer P, Loidl A (1998) Solid State Ion 112:69
Ahlawat N, Agarwal A, Sanghi S, Kishore N (2009) Solid State Ion 180:1356
Srinivasu Ch, Sathe V, Awasthi A, Rahman S (2011) J Non-Cryst Solids 357(1–3):1051
Malugani J, Robert G (1979) Mater Res Bull 14:1075
Gandhi P, Deshpande V, Singh K (1989) Solid State Ion 36:97
Bergoa P, Pontuschka W, Prison J (2007) Solid State Commun 141:545
Srinivasarao G, Veeraiah N (2002) J Phys Chem Solids 63(4):705–717
Markandeya SY, Salagram M, Vithal M, Singh A, Bhikshamaiah G (2008) J Non-Cryst Solids 354:5573
Anshu D, Sanghi S, Agarwal A, Lather M, V. Bhatnagar, Khasa M (2009) International seminar on science and technology of glass materials. IOP Conf Ser 2(1) 012054
Singh K (1997) Solid State Ion 93:147
Verhofe A, Den-Hartog H (1995) J Non-Cryst Solids 182:221
Bale S, Rao N, Rahaman S (2008) Solid State Sci 10:326
Scholzelt H (1991) Glass: nature, structure and properties. Springer, New York
Kharlamov A, Almeida R, Heo J (1996) J Non-Cryst Solids 202:233
Wells A (1984) Structural inorganic chemistry. Clarendon, Oxford
Imre A, Voss S, Mehrer H (2004) J Non-Cryst Solids 333:231
Al-Shahrani A, Al-Hajry A, El-Desoky MM (2003) Phys Status Solidi 200(2):378
Mott N (1969) Philos Mag 19:835
Ichinose N, Nakai Y (1996) J Non-Cryst Solids 203:353
Ali A, Shaaban M (2010) Solid State Sci 12:2148
Murugaraj R, Govindaraj G, George D (2003) Mater Lett 57:1656
Jonscher A (1977) Nature 267:673
Shaaban M, Ali A, El-Nimr M (2006) Mater Chem Phys 96:423
Devidas G, Sankarappa T, Kumar M, Kumar S (2008) J Mater Sci 43:4856. doi:10.1007/s10853-008-2705-z
Elliot S (1987) Adv Phys 36:53
Lanfredi S, Saia P, Lebullenger R, Hernandez A (2002) Solid State Ion 146:329
Sidebottom D (2003) J Phys 15:S1585
Lavín V, Rodríguez-Mendoza U, Martn I, Rodríguez V (2003) J Non-Cryst Solids 319:200
Berkemeier F, Voss S, Imre AW, Mehrer H (2005) Solids 351:3816
Graça M, Ferreira da Silva M, Sombra A, Valente M (2007) Phys B 396:62
Sanghi S, Duhan S, Agarwal A, Aghamkar P (2010) Phys B 405(18):3846
Murawski L, Barczyn′ski R, Samatowicz D (2003) Solid State Ion 157:293
Almond D, Duncan G, West A (1983) Solid State Ion 8:159
Sanghi S, Rani S, Agarwal A, Seth V (2009) Phys B 404:969
Duhan S, Sanghi S, Agarwal A, Sheoran A, Rani S (2009) Phys B 404:1648
Howell F, Bose R, Macedo P, Moynihan C (1974) J Phys Chem 78:639
Nadkarni G, Simmons J (1970) J Appl Phys 41:545
Ghosh S, Ghosh A (2007) J Non-Cryst Solids 353:1287
Acknowledgements
The authors wish to thank Prof. M. K. El-Nimer, physics Department, Faculty of Science, Tanta University for allowing us to carry out the experimental work ac measurements electrical conductivity and for fruitful discussions.
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Shaaban, M.H. Structure and electrical conductivity relaxation studies of Nb2O5-doped B2O3–Bi2O3–LiF glasses. J Mater Sci 47, 5823–5832 (2012). https://doi.org/10.1007/s10853-012-6482-3
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10853-012-6482-3