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71.
We have grown single crystals of the psuedo-one-dimensional compound Sr3CuIrO6, a K4CdCl6-derived monoclinic structure with Cu-Ir chains along the [101] direction. We present the ac and dc magnetization behavior
of the single crystals in comparison with that of the polycrystalline form reported earlier. There is a distinct evidence
for at least two magnetic transitions, at 5 K (T
1) and 19 K (T
2), with different relative magnitudes in the single and polycrystals. The low temperature magnetic relaxation behavior of
both the forms is found to be widely different, exhibiting unexpected time dependence. 相似文献
72.
M. N. Mahanta 《International Journal of Theoretical Physics》1984,23(6):569-574
A result due to Eisenhart is used to justify an averaging process of a theory of gravity. More results of the theory are also deduced, similar to those derived by Einstein for the Nordström theory. 相似文献
73.
74.
M. N. Mahanta 《Annalen der Physik》1989,501(2):149-152
75.
A simple, rapid and cost effective preconcentration method is described for the determination of traces of gold (Au), silver (Ag) and palladium (Pd) in geological samples by flame atomic absorption spectrophotometry (AAS). The method is based on sorption of analytes (Au, Ag and Pd) on powdered activated carbon (AC) at pH 1 in hydrochloric acid (HCl) medium. The samples are decomposed by aqua regia — HCl treatment. The quantitative sorption (better than 92%) of analytes is obtained on AC (in absence of complexing agent), by simply manipulating optimal conditions. The unique feature of the method is, the analytes are recovered quantitatively from AC by oxidizing and completely solubilising the carbon using concentrated nitric acid (HNO3) and perchloric acid (HClO4) i.e. by wet ashing. The method of wet ashing has several advantages over conventional dry ashing. The accuracy of the method is evaluated by analysing, five Canada centre for mineral and energy technology (CANMET) standards; MA-3, MA-1b, FER-1, SU-1A, and CPB-1. In addition, ASK-3 and one inhouse standard, kolar gold field (KGF) samples was also analysed. As no standard for Pd is available, its accuracy was evaluated by standard addition method. The method was applied on numerous geological samples for the determination of Au, Ag and Pd down to 0.1 ppm (based on 10 g sample) within ±10% R.S.D. (n=5). The method could easily be adopted by any laboratory as the inputs are minimal (AC), inexpensive and easily available. 相似文献
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