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THE EFFECT OF GE4+ SUBSTITUTION IN LITHIUM FERRITES
Faculty
Science
Year:
1995
Type of Publication:
Article
Pages:
685-690
Authors:
YOUSIF, AA, MAZEN, SA, ELZAIN, ME
DOI:
10.1002/pssa.2211490219
Journal:
PHYSICA STATUS SOLIDI A-APPLIED RESEARCH WILEY-V C H VERLAG GMBH
Volume:
149
Research Area:
Materials Science; Physics
ISSN
ISI:A1995RH61400018
Keywords :
, EFFECT , GE4+ SUBSTITUTION , LITHIUM FERRITES
Abstract:
X-ray diffraction, infrared, and Mossbauer spectroscopy techniques are used to investigate Li0.5+0.5xGexFe2.5-1.5xO4; x less than or equal to 0.5. The polycrystalline samples show single-phase spinel structure. The lattice constant for x greater than or equal to 0.2 is found to be nearly constant, but smaller than for x = 0. A small component of Fe2+ has been detected in the IR spectra. The Mossbauer absorption patterns give magnetic sextets superimposed on a paramagnetic component that increases with increasing germanium content. The average hyperfine held at the A-site is found to decrease faster than at the B-site. A consistent interpretation of the information obtained from the different methods is provided. It is also suggested to give a qualitative explanation for the differential variation of the average hyperfine fields at the two sites on the basis of supertransferred hyperfine interactions.
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