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초록· 키워드
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The Thermal properties of nano-crystalline CeO<sub>2</sub>, FeO, MgO, Ho<sub>2</sub>O<sub>3</sub>, NiO and Y<sub>2</sub>O<sub>3</sub>, 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 (u<sup>2</sup>(T)), Debye temperature (<sup>θ</sup>D ), melting point (T<sub>m</sub>) and activation energy for vacancy formation (E<sub>f</sub> ). The values of (B(T )) and (u<sup>2</sup>(T )) in the present case were found to be large while the values of θ<sub>D</sub> and E<sub>f</sub> 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.
목차
I. INTRODUCTION
II. EXPERIMENTAL METHODS
III. RESULTS AND DISCUSSION
IV. CONCLUSION
REFERENCES
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