Transcription of INTRODUCTION - Environmental technology
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3 Reviews in Mineralogy & GeochemistryVol. 61, pp. 127-180, 2006 Copyright Mineralogical Society of America1529-6466/06/0061-0003$ : and Magnetic Properties of Sulfi desCarolyn I. Pearce, Richard Pattrick, David J. VaughanSchool of Earth, Atmospheric and Environmental Sciences, and Williamson Research Centre for Molecular Environmental ScienceUniversity of ManchesterManchester, United Kingdome-mail: metal sulfi des exhibit a great diversity of electrical and magnetic properties with both scientifi c interest and practical applications. These properties apply major constraints on mod-els of the electronic structure (or chemical bonding) in sulfi des (Vaughan and Rosso 2006, this volume). The pure and doped synthetic equivalents of certain sulfi de minerals have actual or potential applications in the electronics industries (optical devices, photovoltaics, photodiodes and magnetic recording devices).
128 Pearce, Pa 4 rick, Vaughan have room-temperature conductivities which are largely independent of impurities or lattice defects. Generally, the electrical conductivity (σ) is given by the expression:
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