Al3+-modified elastic properties of copper ferrite

Ultrasonic pulse echo-overlap technique at 300K (9MHz) has been employed to study the elastic properties of Al3+-substituted CuFe2O4 spinel ferrite system. The longitudinal and transverse wave velocities are used to compute elastic moduli and these are corrected to the zero porosity by employing dif...

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Bibliographic Details
Published in:Solid state sciences 2010-12, Vol.12 (12), p.2134-2143
Main Authors: LAKHANI, V. K, MODI, K. B
Format: Article
Language:English
Subjects:
Condensed matter: structure, mechanical and thermal properties
Crystal structure
Disorientation
Elastic constants
Elasticity, elastic constants
Exact sciences and technology
Ferrite
Fracture mechanics
Grain boundaries
Mathematical models
Mechanical and acoustical properties of condensed matter
Mechanical properties of solids
Modulus of elasticity
Physics
Porosity
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Summary:Ultrasonic pulse echo-overlap technique at 300K (9MHz) has been employed to study the elastic properties of Al3+-substituted CuFe2O4 spinel ferrite system. The longitudinal and transverse wave velocities are used to compute elastic moduli and these are corrected to the zero porosity by employing different models. Contrary to expectation, the magnitude of elastic moduli is found to decrease by 75% with only 30% of Al3+-substitution for Fe3+ in the system. The lowering of elastic stiffness is mainly due to residual stress-induced spontaneous cracking and presence of oxygen vacant sites in the material. The lower value of lattice energy for polycrystalline specimens as compared to their single crystalline counterparts have been explained in the light of an increase degree of disorientation at the grain boundary with Al3+-substitution. Display Omitted
ISSN:1293-2558
1873-3085
DOI:10.1016/j.solidstatesciences.2010.09.012