Elastic Properties of Colossal Magnetoresistive Manganites R0.67Sr0.33MnO3 (R = Pr, Nd, Gd)
Y.S. Reddy
Department of Physics, Chaitanya Bharathi Institute of Technology, Hyderabad 500 075, India
Received: July 4, 2015; In final form: July 23, 2015
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The polycrystalline bulk samples of R0.67Sr0.33MnO3 (R = Pr, Nd, Gd) were prepared by solid state reaction method and characterized by powder X-ray diffraction. The room temperature elastic behavior of these materials was investigated by employing ultrasonic pulse transmission technique at 1 MHz. The values of elastic constants were computed from longitudinal and shear velocities. The measured values were corrected to zero porosity using Hasselman and Fulrath's formulae. The variation of elastic moduli with the size of rare earth ion is interpreted in terms of strength of interatomic bonding.

DOI: 10.12693/APhysPolA.129.113
PACS numbers: 75.47.Gk, 75.47.Lx, 62.20.de, 43.20.Hq