EPR Investigation of Monovalent Chromium Centers in Synthetic Pyrite Crystals

Synthetic FeS2 and RuS2 single crystals were prepared by the flux method using PbCl2, bismut, and tellurium as different solvents. FeS2 and some RuS2 samples were doped with elementary vanadium, other RuS2 crystals with manganese and nickel. The EPR spectra revealed Mn2+ in the low-spin state and Ni2+. The lineshape of the Mn sextet turned out to be asymmetrical. In some RuS2 samples we detected an isotropic structureless rather narrow signal with a linewidth down to 0.05 mT and attributed it to the conductivity. Its lineshape becomes symmetrical and Lorentzian by grinding the samples to a polycrystalline powder. The EPR parameters of appropriate spinHamiltonians were determined. The intensities of the allowed and forbidden lines depended very differently on the microwave power due to different degrees of saturation.

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“…[4,5,6] and in RuS2 [7]. Yu et al performed sim ilar EPR measurements with FeS9 [8] that agree with ours essentially.…”

Section: Introductionsupporting

confidence: 81%

“…For T\\ a simple one electron model pre dicts T|| = ~^gßgNß N(r^) [6,15]. After the ta bles of atomic parameters [15] we get T|| = -160 MHz and experimentally -175 MHz corresponding to -0.00586 cm-1.…”

Section: Rus2: Mnmentioning

confidence: 99%

EPRInvestigation of Synthetic, Doped FeS₂ and RuS₂ Single Crystals

Schuler

Dahlem

Siebert

1995

Zeitschrift Für Naturforschung A

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“…This has been very popular for pyrite and most of the published data with Vph measurements have been done on CVT samples. 3,5,7,15,19,21,23,30,34,28,35,38,41,43,84,85,87,[90][91][92][96][97][98][99][100]103,27,110,123,[128][129][130][131][132][133][134][135][136][137][138][139][140][141] Unfortunately the halide transport agent is included within the crystal. 35,92 Pyrite also decomposes at 300 °C into iron sulfide and sulfur gas.…”

Section: Cvt Crystal Growthmentioning

confidence: 99%

Crystal Growth and Surface Modification of Pyrite for Use as a Photovoltaic Material

Young¹

2000

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Pyrite (FeS2) has recently attracted significant interest as a photovoltaic material due to its promising optical properties, high photon to electron conversion yield, and lowcost raw materials. However, hopes have been tempered by recent discoveries that suggest the presence of hard to remove bulk sulfur defects. This research was focused on engineering and implementing the crystallization of pyrite from a sulfur rich solution to counteract the material's natural tendency to form bulk sulfur defects. Homoeptiaxial layers and single-crystal samples have been grown from tellurium sulfur melts with an Fe:S ratio of 1:4 using both natural and synthetic substrates. The homoepitaxial layer has been characterized using scanning electron microscopy (SEM), transmission electron v

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