Role of some rare earth (RE) ions (RE = La, Pr, Nd, Sm, Gd and Dy) in crystal and mechanical behaviours of sol-gel derived ZrO2-2 mol% REO2O3 spun fibres calcined at 1300°C |
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| Authors: | M K Naskar M Chatterjee D Ganguli |
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| Affiliation: | (1) Sol-Gel Division, Central Glass and Ceramic Research Institute, 700 032 Kolkata, India;(2) Present address: Department of Materials Science, Indian Association for the Cultivation of Science, 700 032 Kolkata, India |
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| Abstract: | Crystal behaviours such as crystallization temperature (amorphous to tetragonal (t) zirconia), tendency of phase transformation (tetragonal to monoclinic (m) zirconia) and lattice strain were studied with mechanical property e.g. tensile strength of sol-gel derived ZrO2-2 mol% RE2O3 (RE = La, Pr, Nd, Sm, Gd and Dy) spun fibres. Rare earth cations of varying sizes played a significant role in changing the
above mentioned properties of ZrO2-2 mol% RE2O3 fibres. It was found that with decreasing the ionic size difference between the zirconium and RE ions, crystallization temperature
(amorphous →)t-ZrO2) decreased, the probability of phase transformation (t→m) decreased, lattice strain which is related to lattice distortion decreased and tensile strength increased. |
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| Keywords: | Rare earth ionic size crystallization temperature phase transformation lattice strain tensile strength |
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