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Influence of quenching on the structural and conduction characteristics of lithium sulfate

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Abstract

Lithium sulfate quenched from the high-temperature melt using conventional quenching as well as rapid quenching techniques has been investigated using X-ray diffraction, scanning electron microscope, differential scanning calorimetry (DSC), vibrational spectroscopy techniques, and electrical conductivity measurements. Crystal structure of the quenched samples studied using X-ray diffraction shows a less ordered β-Li2SO4 phase. This is accompanied by a decrease in phase transition temperature in DSC measurements along with a decrease in the molar enthalpy associated with the transition. Raman and FT-IR spectroscopy studies reveal the disorder in the quenched samples by a significant broadening of the bands associated with the fundamental vibrational modes of SO4 2− ion. Temperature variation of conductivity shows an enhancement in ionic conductivity by one order of magnitude with a slight decrease in phase transition point for quenched samples over unquenched Li2SO4.

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Acknowledgements

The authors sincerely acknowledge Prof. A. Subrahmanyam, Department of Physics, Indian Institute of Technology Madras for important discussions and for facilitating the conduction of experiments.

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  1. Department of Physics, Indian Institute of Technology Madras, Chennai, 600 036, India

    Sony Varghese & K. Hariharan

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  1. Sony Varghese
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  2. K. Hariharan
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Correspondence to Sony Varghese.

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Varghese, S., Hariharan, K. Influence of quenching on the structural and conduction characteristics of lithium sulfate. Ionics 24, 2591–2599 (2018). https://doi.org/10.1007/s11581-017-2395-0

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