Electron-paramagnetic-resonance study of the Cr3+ and Ni2+ ions and the (SCl)2− defect in FeS2

Abstract

An electron-paramagnetic-resonance study of the iron pyrite crystals grown by the method of chemical-vapor transport is reported. Cr3+ and Ni2+ ions were detected as substitutional impurities. An effective spin S =1/2 defect species that exhibits hyperfine couplings to the two natural isotopes of chlorine was detected in sulfur-deficient FeS2 grown by using ICl3 as a transport agent. This species can be identified as the defect species (SCl)2−. The similarity and differences exhibited by this defect species in the sulfur-deficient Fe pyrite and the chalcogen-deficient Ru pyrites are discussed.

Microelectronic junctions in arsenian pyrite due to impurity and mixed sulfide heterogeneity

“…However, previous work by Lehner et al (2006Lehner et al ( , 2007 and Savage et al (2008) concluded Ni to have no significant influence on carrier concentration. Even earlier work by Chandler and Bene (1974) and Yu et al (1992) both point to its substitution with Fe (Ni Fe ) generating a deep level defect band that must be incompletely ionized at room temperature. More recent Hall measurements vs. temperature by Lehner et al (2012) confirm Ni Fe results in deep-levels at 0.37 and 0.42 eV below the CB edge.…”