ChemInform Abstract: Low-Temperature Organometallic Synthesis of Crystalline and Glassy Ternary Semiconductors M(II)M(IV)P2 where M(II): Zn and Cd, and M(IV): Ge and Sn.
Abstract
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ChemInform Abstract
The ternary title phosphides are prepared by reaction of the organic precursors (M(II)(P(SiMe3)2)2)2 and M(IV)X4 (X: OMe, Cl) via the intermediates (M(II)M(IV)P2(X)x(SiMe3)x) (x = 0.3-0.8), which on annealing at 250-350 °C in vacuo are converted to the amorphous M(II)M(IV)P2 compounds yielding polycrystalline powders at temp. 200- 400 °C lower than by conventional melt quenching. Neither ZnSnP2 nor CdSnP2 can be obtained as pure-phase powders. In contrast to ZnGeP2 and CdGeP2 both ZnSnP2 and CdSnP2 melt incongruently and form peritactically. Comparisons between the glassy phase obtained by quenching and organometallic-derived amorphous CdGeP2 show that both have very similar or identical structures.
