Electron-precise/deficient La(5-x)Ca(x)Ge4 (3.4 < or = x < or = 3.8) and Ce(5-x)Ca(x)Ge4 (3.0 < or = x < or = 3.3): probing low-valence electron concentrations in metal-rich Gd5Si4-type germanides

Li-Ming Wu; Sang-Hwan Kim; Dong-Kyun Seo

doi:10.1021/ja055568s

Electron-precise/deficient La(5-x)Ca(x)Ge4 (3.4 < or = x < or = 3.8) and Ce(5-x)Ca(x)Ge4 (3.0 < or = x < or = 3.3): probing low-valence electron concentrations in metal-rich Gd5Si4-type germanides

J Am Chem Soc. 2005 Nov 16;127(45):15682-3. doi: 10.1021/ja055568s.

Authors

Li-Ming Wu¹, Sang-Hwan Kim, Dong-Kyun Seo

Affiliation

¹ Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287-1604, USA.

PMID: 16277492
DOI: 10.1021/ja055568s

Abstract

We report for the first time the syntheses of electron-precise/deficient alloys, Ln5-xCaxGe4 (Ln = La, Ce; x = 3.37, 3.66, 3.82 for La; x = 3.00, 3.20, 3.26 for Ce), in the metal-rich R5Tt4 Zintl system (R = rare earth metal; Tt = Si, Ge). The new alloys extend the phase width from electron-rich to open-shell electron-deficient region in the metal-rich Zintl system and demonstrate possible occurrence of varied electron deficiencies in Zintl phases without structural changes, as a result of other existing structure-forming factors.