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Spectroscopic, mechanical and magnetic characterization of some bismuth borate glasses containing gadolinium ions
Ist Teil von
Solid state sciences, 2010-08, Vol.12 (8), p.1426-1434
Ort / Verlag
Issy-les-Moulineaux: Elsevier Masson SAS
Erscheinungsjahr
2010
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
The ultrasonic parameters, the optical parameters along with the IR spectroscopy and magnetic susceptibility studies have been employed to explore the role of Gd
2O
3 in the structure of the glasses
xGd
2O
3–60B
2O
3–10MoO
3–(30-
x)Bi
2O
3, with 0 ≤
x ≤ 7 mol %. IR analysis indicates that Gd
2O
3 is preferentially incorporated into the borate network-forming BO
4 units. It is assumed that Bi
2O
3 and MoO
3 enter the structure as modifiers in the form of BiO
6 and MoO
6 only. The compositional dependence of the mechanical and the optical parameters are interpreted in terms of the transformation of the structural units BO
3 into BO
4, the increase in the number of bridging oxygen atoms, and the substitution of high bond strength Gd–O, in the place of low bond strength Bi–O bond. The results of the magnetic susceptibility reveal the paramagnetic behavior as described by the Curie-Weiss law and indicating the presence of weak antiferromagnetic exchange interactions between Gd
3+ ions. The magnetic entropy change of the glasses was determined according to the temperature and magnetic field dependence of magnetization.
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