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Prediction and synthesis of a non-Zintl silicon clathrate

Authors: T.F.T. Cerqueira, Stéphane Pailhès, Régis Debord, Valentina M. Giordano, Romain Viennois, Jingming Shi, Silvana Botti, and M.A.L. Marques

Ref.: Chem. Mater. 28, 3711-3717 (2016)

Abstract: We use computational high-throughput techniques to study the thermodynamic stability of ternary type-I Si clathrates. Two strategies to stabilize the structures are investigated: through endohedral doping of the 2a and 6d Wyckoff positions (located at the center of the small and the large cages respectively), and by substituting the Si 6c positions. Our results agree with the overwhelming majority of experimental results, and predict a series of unknown clathrate phases. Many of the stable phases can be explained by the simple Zintl-Klemm rule, but some are unexpected. We then successfully synthesize one of the latter compounds, a new type-I silicon clathrate containing Ba (inside the cages) and Be (in the 6c position). These results prove the predictive power and reliability of our strategy, and motivate the use of high-throughput screening of materials properties for the accelerated discovery of new clathrate phases.

Citations: 8 (Google scholar)

DOI: 10.1021/acs.chemmater.6b00392

Bibtex:

@article{Cerqueira_2016,
	doi = {10.1021/acs.chemmater.6b00392},
	url = {https://doi.org/10.1021%2Facs.chemmater.6b00392},
	year = 2016,
	month = {may},
	publisher = {American Chemical Society ({ACS})},
	volume = {28},
	number = {11},
	pages = {3711--3717},
	author = {Tiago F. T. Cerqueira and St{\'{e}}phane Pailh{\`{e}}s and R{\'{e}}gis Debord and Valentina M. Giordano and Romain Viennois and Jingming Shi and Silvana Botti and Miguel A. L. Marques},
	title = {Prediction and Synthesis of a Non-Zintl Silicon Clathrate},
	journal = {Chemistry of Materials}
}