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411 results on '"Evans, B. J."'

35. Order-disorder and magnetic exchange interactions in substituted strontium hexaferrite SrAxFe12-xO19 (A = Ga, In)

Author

Thompson, G.K. and Evans, B. J.

Subjects
Iron compounds -- Research, Magnetism -- Analysis, Metal ions -- Research, Physics
Abstract

Doping of SrFe12O19 with 0.3 mol per unit of Ga3+ or In3+ ions causes a division in the 12K octahedral subspectrum. The splitting occurs due to a magnetic exchange interaction of some of the 12k2 Fe3+ ions. The random changes in the exchange interactions do not influence the 12k splitting.

Published
1994

41. The effects of chemical composition on electron delocalization and magnetic ordering in ilvaite...

Author

Dotson, Cherie R. and Evans, B. J.

Subjects
*IRON compounds, *X-ray diffractometers, *MAGNETIC susceptibility, *MOSSBAUER spectroscopy
Abstract

Presents information on a study which investigated the chemical composition of mineral specimens of the mixed-valence solid ilvaite iron compound using x-ray diffraction, magnetic susceptometry, ...iron Mossbauer spectroscopy and electrical conductivity. Experimental details; Results and discussion.

Published
1999
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42. High-pressure 57Fe Mössbauer study of Fe3O4 at 298 K.

Author

Evans, B. J. and Pan, Lu-San

Subjects
*IRON spectra, *MOSSBAUER spectroscopy, *SPECTRUM analysis, *STOICHIOMETRY
Abstract

Presents a study which determined the influence of pressure on the Möbauer spectrum of a nearly stoichiometric sample of Fe[sub3]O[sub4] that exhibits no isomer shift induced splitting of the B-site patterns of the spectrum at 300 K. Procedure used to obtain the spectra; Basis for the adequacy of the fits; Factor attributed to the components of the B site.

Published
1987
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44. Order-disorder and magnetic exchange interactions in substituted strontium hexaferrite SrAxFe12-xO19(A=Ga, In).

Author

Thompson, G. K. and Evans, B. J.

Subjects
*MOSSBAUER spectroscopy, *HYPERFINE structure
Abstract

Presents a study that investigated the unusual behavior of the 12k site in SrGa[subx]Fe[sub12-x]O[sub19] (0.3≤x≤6.0) and SrIn[subx]Fe[sub12-x]O[sub19] (0.3≤x≤1.4) by means of [sup57]Fe M&oml;ssbauer spectroscopy at 298 Kelvin. Lattice constants of substituted SrFe[sub12]O[sub19]; Description of the bifurcation of the 12k M&oml;ssbauer subspectrum; Factors that affect splitting of the 12k magnetic hyperfine spectrum.

Published
1994
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45. The structure–property relationships in M-type hexaferrites: Hyperfine interactions and bulk magnetic properties.

Author

Thompson, G. K. and Evans, B. J.

Subjects
*IRON, *FERRITES
Abstract

Presents a study which determined the influence of each of the iron (Fe) sites on the bulk magnetic properties of the different MFe[sub12]O[sub19] compounds. Dynamical aspects of the hyperfine interactions; Magnitude of the hyperfine interactions of a given Fe; Structure of the M-type hexaferrites MFe[sub12]O[sub19].

Published
1993
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47. Crystal/chemical structures and magnetic properties of naturally occurring Mn1.7Fe1.3O4.

Author

Evans, B. J., Dunham, W. R., Porter, C., Abernathy, S. M., and Bluncson, C.

Subjects
*FERRITES, *THERMODYNAMIC equilibrium, *MANGANESE compounds
Abstract

Presents a study which examined the crystal/chemical structures and magnetic properties of naturally occurring manganese[sub1.7]iron[sub1.3]oxygen[sub4]. Investigation of the thermodynamic equilibrium of the crystal/chemical structrues of manganese ferrite iwakiite under conditions of regional metamorphism; Experimental details; Results and discussion.

Published
1988
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