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AC Conductivity and Electrical Modulus Studies on Lithium Vanadophosphate Glasses
Author(s) -
Muralidharan P.,
Nallamuthu N.,
Prakash I.,
Satyanaraya.,
Venkateswarlu M.
Publication year - 2007
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1551-2916.2006.01355.x
Subject(s) - materials science , activation energy , analytical chemistry (journal) , conductivity , lithium (medication) , electrical resistivity and conductivity , relaxation (psychology) , glass transition , electrical impedance , dielectric , thermodynamics , mineralogy , composite material , chemistry , electrical engineering , polymer , chromatography , medicine , psychology , social psychology , physics , engineering , endocrinology , optoelectronics
The lithium vanadophosphate (LVP) glasses were synthesized through a conventional melt quench method for various modifier ( m ) to formers ( f ) ratios ( m / f ) [ m %Li 2 O/ f %{0.3V 2 O 5 +0.7P 2 O 5 }, where the m / f =0.43, 0.66, 1.0, 1.5, and 1.63]. Nature, structure, and glass transition T g temperature for the prepared LVP samples were characterized by X‐ray diffraction, FTIR, and DSC techniques, respectively. Impedance measurements were made for the various m / f ratios of LVP glasses at 423 K and above temperatures. The bulk conductivity (σ) and the activation energy ( E a ) for the LVP glass samples were calculated, respectively, from the analyzed impedance data of the various m / f ratios measured at different temperatures, using Boukamp equivalent circuit software. The best conducting [σ=4.83 × 10 −8 S/cm at 423 K] m / f ratio of LVP was found to be 60%Li 2 O–40% [0.3V 2 O 5 +0.7P 2 O 5 ] and its activation energy ( E a )=0.59 eV. AC conductivity was calculated from the impedance data and analyzed using Jonscher's power law for various m/f ratios of the LVP glasses at different temperatures. The power law exponent s , evaluated from AC conductivity of the LVP glasses, exhibited a non‐linear behavior with temperatures. Kohlrausch–William–Watts stretched exponential function was used to fit the calculated modulus data and ion relaxation behavior was studied for the LVP glasses.