MOSSBAUER AND MAGNETIC STUDY OF BRAUNITE MINERAL

Authors
TANEJA SP GARG VK
Citation
Sp. Taneja et Vk. Garg, MOSSBAUER AND MAGNETIC STUDY OF BRAUNITE MINERAL, Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms, 76(1-4), 1993, pp. 239-241
Citations number
5
Categorie Soggetti
Physics, Nuclear","Nuclear Sciences & Tecnology","Instument & Instrumentation
Journal title
Nuclear instruments & methods in physics research. Section B, Beam interactions with materials and atoms → ACNP
ISSN journal
0168583X
Volume
76
Issue
1-4
Year of publication
1993
Pages
239 - 241
Database
ISI
SICI code
0168-583X(1993)76:1-4<239:MAMSOB>2.0.ZU;2-R
Abstract
Braunite mineral from Triodi (India) (21-degrees-41'N, 79-degrees-47'E ) manganese deposits has been studied by Mossbauer spectroscopy, and m agnetic susceptibility. The room temperature Mossbauer spectrum shows a well resolved quadrupole splitting which has been attributed to the substitution of iron in Mn(2) site. Emergence of another doublet at li quid nitrogen temperature has been attributed to the location of small quantities of iron in Mn(4) site. Iron is in FeIII and high spin stat e. At 60 K a poorly resolved sextet and a well resolved doublet is obs erved. Collapse of Mossbauer spectrum at 50 K has been attributed to s pin-lattice relaxation and below this temperature there are two sextet s of internal magnetic fields of the order of 415 kOe each. One magnet ic transition is between 70 and 60 K while the other magnetic transiti on is between 60 and 50 K.