Conductivity studies of lithium zinc silicate glasses with varying lithium contents

Bulletin of materials science

V K Shrikhande³  M S Jogad²  G P Kothiyal³  S K Deshpande¹  P S Goyal¹ 

[1] UGCâ€�?�DAE Consortium for Scientific Research, Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400 085, India$$UGCâ€�?�DAE Consortium for Scientific Research, Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaUGCâ€�?�DAE Consortium for Scientific Research, Mumbai Centre, R5 Shed, Bhabha Atomic Research Centre, Mumbai 400 085, India$$;S.B. College of Science, Gulbarga 585 103, India$$S.B. College of Science, Gulbarga 585 103, IndiaS.B. College of Science, Gulbarga 585 103, India$$;Technical Physics & Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$Technical Physics & Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, IndiaTechnical Physics & Prototype Engineering Division, Bhabha Atomic Research Centre, Mumbai 400 085, India$$

关键词: Ionic conductivity;    glasses;    electrical modulus;    dielectric relaxation.;   

DOI  :  

学科分类：材料工程

来源: Indian Academy of Sciences

【 摘 要 】

The electrical conductivity of lithium zinc silicate (LZS) glasses with composition, (SiO₂)_0.527 (Na₂O)_0.054(B₂O₃)_0.05(P₂O₅)_0.029(ZnO)_{0.34â€�?�ð�?��?}(Li₂O)_ð‘�? (ð‘�? = 0.05, 0.08, 0.11, 0.18, 0.21, 0.24 and 0.27), was studied as a function of frequency in the range 100 Hzâ€�??15 MHz, over a temperature range from 546â€�??637 K. The a.c. conductivity is found to obey Jonscher’s relation. The d.c. conductivity ($sigma_{d.c.}$) and the hopping frequency($omega_{h}$), inferred from the a.c. conductivity data, exhibit Arrhenius-type behaviour with temperature. The electrical modulus spectra show a single peak, indicating a single electrical relaxation time, 𝜏, which also exhibits Arrhenius-type behaviour. Values of activation energy derived from $sigma_{d.c.}, omega_{h}$ and 𝜏 are almost equal within the experimental error. It is seen that $sigma_{d.c.}$ and $omega_{h}$ increase systematically with Li₂O content up to 21 mol% and then decrease for higher Li₂O content, indicating a mixed alkali effect caused by mobile Li⁺ and Na⁺ ions. The scaling behaviour of the modulus suggests that the relaxation process is independent of temperature but depends upon Li⁺ concentration.

【 授权许可】

Unknown