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Reaction enthalpies of Cu2ZnSnSe4 synthesis in KI

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Abstract

The phase transitions and chemical reactions in the formation process of Cu2ZnSnSe4 (CZTSe) from CuSe, SnSe, and ZnSe in the presence of KI were studied using the DTA method for the determination of thermal effects. XRD and Raman spectroscopy were performed for the phase analysis in samples after heating them for prolonged time to several degrees of temperatures higher than peak-top temperatures of DTA effects in heating and cooling curves. The chemical pathways of the CZTSe formation before and during the melting of KI were clarified. The reaction enthalpies were determined using pure KI as a substance for the calibration of enthalpy values. In the mixtures, the melting of KI is always accompanied by some dissolution of the precursor compounds and lowering of the melting temperature in comparison with pure KI. The initiator of the process of the partial CZTSe formation at around 400 °C is elemental Se. The CZTSe formation of binary precursors in liquid phase of KI takes place with the experimentally determined enthalpy of −36 ± 2 kJ mol−1. The heat of fusion of formed CZTSe is 4 kJ mol−1 at 788 °C.

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Acknowledgements

The Doctoral Studies and Internationalization Program DoRa of the European Social Funds, Estonian Science Foundation grants (G8964 and G9425), the projects of Estonian Ministry of Education and Research (IUT 19-28 and TK117T), EAS (EU29713), and National R&D programs (AR10128 and AR12128) supported this research.

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Authors and Affiliations

  1. Department of Materials Science, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia

    Inga Leinemann, Kristi Timmo, Maarja Grossberg, Mare Altosaar & Dieter Meissner

  2. Laboratory of Inorganic Materials, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia

    Tiit Kaljuvee & Kaia Tõnsuaadu

  3. Centre for Materials Research, Tallinn University of Technology, Ehitajate tee 5, 19086, Tallinn, Estonia

    Rainer Traksmaa

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  1. Inga Leinemann
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Correspondence to Inga Leinemann.

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Leinemann, I., Timmo, K., Grossberg, M. et al. Reaction enthalpies of Cu2ZnSnSe4 synthesis in KI. J Therm Anal Calorim 119, 1555–1564 (2015). https://doi.org/10.1007/s10973-014-4339-5

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