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Tahira Amer Bashir Ziya,Muhammad Naeem Ashiq,고재현,Farooq Bashir,Ghulam Shabbir 한국물리학회 2020 새물리 Vol.70 No.2
The Thermal properties of nano-crystalline CeO2, FeO, MgO, Ho2O3, NiO and Y2O3, prepared by using the co-precipitation method, have been investigated using X-ray diffraction (XRD) at room temperature. The integrated intensity data obtained from the X-ray diffraction experiments was utilized to determine the temperature factor (B(T)), mean square amplitude of vibration (u2(T)), Debye temperature (D), melting point (Tm) and activation energy for vacancy formation (Ef ). The values of (B(T)) and (u2(T)) in the present case were found to be large while the values of D and Ef were found to be lower than the corresponding values reported for the binary oxides with large particle sizes. This suggests that a decrease in particle size from micro to nano-scale may induce weakening of the bonds. On a nano-scale as compared to ordinary size, the values of the melting points were found be higher for the heavier atomic oxides.