Compound Formation and Local Structure in Ternary Metal-Phosphorus-Selenium Systems

✍ Scribed by R.H.P. Francisco; H. Eckert

• Publisher: Elsevier Science
• Year: 1994
• Tongue: English
• Weight: 283 KB
• Volume: 112
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1994.1303

✦ Synopsis

The formation of ternary compounds is investigated in a variety of (M)-P-Se systems ( (M=\mathrm{Cd}, \mathrm{Sn}, \mathrm{Zn}, \mathrm{Ca}, \mathrm{Cu}), In), using X-ray powder diffraction and ({ }^{31} \mathrm{P},{ }^{77} \mathrm{Se},{ }^{13} \mathrm{Cd},{ }^{19} \mathrm{Sn}) MAS NMR. Compound formation in these systems is dominated by the P-Se anions, (\left|\mathrm{P}{2} \mathrm{Se}{6}\right|^{4-}) and (\left|\mathrm{PSe}{4}\right|^{3-}). These two types of local structures can be identified on the basis of ({ }^{31} \mathrm{P}) chemical shift ranges and distinguished with the help of the Dipolar Recovery at the Magic Angle (DRAMA) technique. A new compound was found and characterized as (\mathrm{Ca}{2} \mathrm{P}{2} \mathrm{Se}{6}), orthorhombic, (a=5.73(1) \AA, b=9.86(1) \AA), (c=15.78(1) \AA), with (\left[\mathrm{P}{2} \mathrm{Se}{6}\right]^{4-}) units. 1994 Academic Press, Inc.