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Salopek DS 《Physical review D: Particles and fields》1995,52(10):5563-5575
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Fluorine at 1–5 torr pressure was dissociated with a microwave discharge and passed over samples of UO2 or U3O8. The only reaction products were UF6 and O2. The reaction rates were independent of particle size and sample depth, but depended upon the geometric surface of the sample. Kinetic studies were interpreted to show that F-atoms react immediately upon contact with the surface, and that both F2-molecules and F-atoms react with the sample. When the ratio, F/F2, is relatively low, the partial pressure of F-atoms is rate determining. When the ratio, F/F2, is relatively high the rate of diffusion of total fluorine (F+F2) to the surface is rate determining. 相似文献
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CM Thaker S Rayaprol Krushna Mavani DS Rana MS Sahasrabudhe SI Patil DG Kuberkar 《Pramana》2002,58(5-6):1035-1039
The effect of simultaneous substitution of a fluctuating cation and a divalent cation in LaMnO3 perovskite modifies the properties of the material to exhibit large valence colossal magnetoresistance (CMR) effect. A good
example of these properties is (La1−2x
Pr
x
Ca
x
)MnO3 (LPCMO) type CMR material. In this communication it is reported that, with the increase in x (for x=0.1, 0.15, 0.2), the T
c varies between 100 and 120 K with improvisation in metal-insulator transition. Interestingly, resistance increases with x from few hundred ohms to few kilo ohms with corresponding decrease in the unit cell volume. The results of the studies using
X-ray diffraction (XRD), electrical resistivity, magnetoresistance and ac susceptibility measurements on LPCMO samples for
understanding the structural, transport and magnetic properties are discussed in detail. 相似文献
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