The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A2LiAlTt2 (A = Mg, Ca, Sr, Ba; Tt = Si, Ge)

Kontomaris, Paraskevi; Darone, Gregory M.; Paredes-Quevedo, Laura C.; Bobev, Svilen

doi:10.3390/inorganics11090351

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The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge)

¹

Charter School of Wilmington, Wilmington, DE 19807, USA

²

Departamento de Química, Facultad de Ciencias, Universidad Nacional de Colombia-Bogotá, Carrera 30 No. 45-03, Bogotá 111321, Colombia

³

Department of Chemistry and Biochemistry, University of Delaware, Newark, DE 19716, USA

^*

Author to whom correspondence should be addressed.

Inorganics 2023, 11(9), 351; https://doi.org/10.3390/inorganics11090351

Submission received: 1 August 2023 / Revised: 16 August 2023 / Accepted: 23 August 2023 / Published: 26 August 2023

(This article belongs to the Special Issue Modern Methods, Modern Users, and Modern Materials: Solid-State Materials Synthesis and Crystal Growth Methods)

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Abstract

Reported are the synthesis and structural characterization of a series of quaternary lithium-alkaline earth metal alumo-silicides and alumo-germanides with the base formula A₂LiAlTt₂ (A = Ca, Sr, Ba; Tt = Si, Ge). To synthesize each compound, a mixture of the elements with the desired stoichiometric ratio was loaded into a niobium tube, arc welded shut, enclosed in a silica tube under vacuum, and heated in a tube furnace. Each sample was analyzed by powder and single-crystal X-ray diffraction, and the crystal structure of each compound was confirmed and refined from single-crystal X-ray diffraction data. The structures, despite the identical chemical formulae, are different, largely dependent on the nature of the alkaline earth metal. The differing cation determines the structure type—the calcium compounds are part of the TiNiSi family with the Pnma space group, the strontium compounds are isostructural with Na₂LiAlP₂ with the Cmce space group, and the barium compounds crystallize with the PbFCl structure type in the P4/nmm space group. The anion (silicon or germanium) only impacts the size of the unit cell, with the silicides having smaller unit cell volumes than the germanides.

Keywords: lithium; germanium; silicon; solid-state structures; synthesis; Zintl phases

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MDPI and ACS Style

Kontomaris, P.; Darone, G.M.; Paredes-Quevedo, L.C.; Bobev, S. The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge). Inorganics 2023, 11, 351. https://doi.org/10.3390/inorganics11090351

AMA Style

Kontomaris P, Darone GM, Paredes-Quevedo LC, Bobev S. The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge). Inorganics. 2023; 11(9):351. https://doi.org/10.3390/inorganics11090351

Chicago/Turabian Style

Kontomaris, Paraskevi, Gregory M. Darone, Laura C. Paredes-Quevedo, and Svilen Bobev. 2023. "The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge)" Inorganics 11, no. 9: 351. https://doi.org/10.3390/inorganics11090351

APA Style

Kontomaris, P., Darone, G. M., Paredes-Quevedo, L. C., & Bobev, S. (2023). The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge). Inorganics, 11(9), 351. https://doi.org/10.3390/inorganics11090351

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The Synthesis and Crystal Structure of Six Quaternary Lithium-Alkaline Earth Metal Alumo-Silicides and Alumo-Germanides, A₂LiAlTt₂ (A = Mg, Ca, Sr, Ba; Tt = Si, Ge)

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