Thermoluminescence kinetics of pyrite (FeS sub 2 )

Conference · Mon Jan 01 04:00:00 EST 1990

OSTI ID:5853405

Silverman, A N; Levy, P W; Kierstead, J A

Thermoluminescence of pyrite (FeS{sub 2}) has been investigated to study the kinetics of single peak glow curves. The material used normally exhibits one large and four small peaks. However a glow curve can be obtained with only the large single peak that is suitable for testing thermoluminescence kinetics. Glow curves from aliquots of a single natural pyrite crystal studied in detail contain two low intensity thermoluminescence (TL) peaks at {approx}90{degree} and {approx}250{degree}C, and two chemiluminescence (CL) peaks at {approx}350{degree} and {approx}430{degree}C. The CL peaks are largely removable by initially heating the sample chamber under vacuum, pumping through liquid nitrogen traps, and recording glow curves immediately after helium is introduced, procedures which reduce system contaminants that react with pyrite. The shape, the variation of the temperature of the peak maximum (T{sub max}) with dose, and the retrapping to recombination cross section ratio {sigma} of the large 250{degree}C peak are better described by the general one trap (GOT) kinetic equation, the basic equation from which the 1st and 2nd order kinetic equations are obtained as special cases (see text), than by the 1st and 2nd order equations. 12 refs., 7 figs.

• Research Organization: Brookhaven National Lab., Upton, NY (USA)
• Sponsoring Organization: DOE; USDOE, Washington, DC (USA)
• DOE Contract Number: AC02-76CH00016
• OSTI ID: 5853405
• Report Number(s): BNL-46067; CONF-9007188--2; ON: DE91011710
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360603* -- Materials-- Properties
CHALCOGENIDES
CHEMILUMINESCENCE
EQUATIONS
GLOW CURVE
IRON COMPOUNDS
IRON SULFIDES
KINETIC EQUATIONS
LUMINESCENCE
MINERALS
PYRITE
SULFIDE MINERALS
SULFIDES
SULFUR COMPOUNDS
THERMOLUMINESCENCE
TRANSITION ELEMENT COMPOUNDS