Effect of Mn2+ ions on spectroscopic and electrical properties of lithium strontium borate glasses

Bhogi, Ashok; Srinivas, B.; Papolu, Padmavathi; Shareefuddin, Md.; Kistaiah, P.

doi:10.1016/j.matchemphys.2022.126698

Cited by 22 publications

(1 citation statement)

References 69 publications

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“…Antisymmetric stretching vibrations with three non-bridging oxygens (NBO's) of B-O-B groups have been detected with the bands about 1496 cm -1 in all of the glasses [25]. different temperatures was determined from the complex impedance spectra at the foot on real (Z¢) axis of the high-frequency geometrical resistance line [27,[30][31][32][33]. Furthermore, when the temperature rises, the radius of the semi-circular arc corresponding to the bulk resistance of the glass samples diminishes, showing that the migration of charge carrier ions is thermally accelerated and the relaxation of ions is non-Debye type, and conductivity increases [19,34,35].…”

Section: Ftirmentioning

confidence: 99%

Effect of Alkaline earth oxides on the ionic conductivity of Boro-Tellurite glasses for solid state ion batteries

BOORA¹,

Chary²,

Shareefuddin³

2022

Phys. Scr.

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The complex impedance spectroscopy studies (electrical impedance, a.c. conductivity, dielectric constant, loss tangent) of the boro-tellurite glasses were measured as a function of the alkaline earth oxide content at broad range of frequencies and temperatures. Three series of boro-tellurite glasses containing BaO/SrO viz. BaO-TeO2-TiO2-B2O3 (BTTB), BaO-TeO2-B2O3 (BTB) and SrO-TeO2-TiO2-B2O3 (STTB) were prepared by the melt quenching method. The prepared glasses were characterized by XRD, DSC, density, FTIR and complex impedance spectroscopy experimental techniques. The XRD spectra exhibited no characteristic sharp peaks indicating the amorphous nature of the prepared glass samples. The glass transition temperature (Tg) values were evaluated from the DSC thermograms. The density values were found to increase with BaO content while they decreased with SrO content. This variation was attributed to the different density values of BaO and SrO. FTIR spectra revelated the presence of different structural units like BO3 and BO4. Impedance studies demonstrated that the replacement of TeO2 by the BaO content enhanced the ionic conductivity. The impedance plots of BTTB, BTB and STTB glasses exhibited nearlys semicircles. The bulk resistance (Rb) was calculated from the impedance plots. It was observed that the Rb values decrease with increasing BaO in BTTB and BTB glasses, while it increased with SrO in STTB glasses which may be attributed to the variation of mobile charge carriers. The Rb values vary as BTB > BTTB > STTB. The capacitance calculated from the impedance plots increased with increasing BaO mol% and decreasing SrO mol%. The capacitance also increased with increasing temperature. The power law exponent (k) values decrease with increasing temperature. Therefore, the ac conduction mechanism may follow correlated barrier hopping model. The real part of dielectric constant (ε^') has high values at low frequencies, which decreased rapidly with surge of frequency. At high frequencies the contribution of charge accumulation is minimum resulting in constantε^'.

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