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Issue 24, 2017
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Revealing the slow decomposition kinetics of type-I clathrate Ba8Ga16Ge30

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Abstract

Inconsistencies in high temperature thermoelectric property measurements of Ba8Ga16Ge30 have prompted our study on the thermal stability of this heavily studied inorganic clathrate. Using X-ray diffraction, thermal analysis, and imaging techniques on both powder and spark plasma sintered pelletized samples, we probe the structure and decomposition characteristics of this important high temperature thermoelectric material. We demonstrate that the decomposition of Ba8Ga16Ge30 is extremely dependent on the heating conditions employed and, as a result of the slow decomposition kinetics of the clathrate, reveal that the true stability of this system has been overlooked in the extensive literature available. Loss of Ga and Ge from the clathrate cage is evident in all high temperature experiments under both air and inert environments. This study serves to highlight that the underlying structural chemistry and stability of thermoelectric materials at high temperature needs to be considered in parallel with the thermoelectric properties which constitute the figure of merit. Only then will reliable thermoelectric modules for real applications be realized.

Graphical abstract: Revealing the slow decomposition kinetics of type-I clathrate Ba8Ga16Ge30

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Publication details

The article was received on 19 Mar 2017, accepted on 21 May 2017 and first published on 25 May 2017


Article type: Paper
DOI: 10.1039/C7CP01753G
Citation: Phys. Chem. Chem. Phys., 2017,19, 15734-15744
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    Revealing the slow decomposition kinetics of type-I clathrate Ba8Ga16Ge30

    H. Reardon, A. B. Blichfeld, H. Kasai, H. Yin, E. D. Bøjesen and B. B. Iversen, Phys. Chem. Chem. Phys., 2017, 19, 15734
    DOI: 10.1039/C7CP01753G

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