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Reorientations of NH4+ ions in the ferroelectric phase of (NH4)2SO4
physica status solidi (a), 1990(NH4)2SO4 is a ferroelectric having two types of NH4 ions. It is of interest to know if the reorientational motions of these ions change in going from the paraelectric to the ferroelectric phase at 223 K. We have studied the reorientational motion of NH4 ions in this salt at 230 and 215 K using the neutron quasielastic scattering technique.
P. S. Goyal +3 more
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Studies on NH4+ derepression and NH4+ excretion by Azotobader chroococcum
Zentralblatt für Mikrobiologie, 1988Summary Azotobader chroococcum-2, an isolate from wheat rhizosphere, was mutagenised by UV irradiation. The mutants were isolated on indicator media. Nif mutants were tested for NH4+ derepression. 6 mutants showed acetylene reduction in the presence of 1 mM NH4+.
P.K. Sharma, V.P.S. Chahal
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The tunneling frequencies of NH4+ and NH3D+ in (NH4)2PdCl6
Chemical Physics, 2001Abstract Is the hindered rotation of NH 3 D + in ammonium solids one or three dimensional? Results of a recent inelastic neutron scattering study of NH 3 D + in (NH 4 ) 2 PdCl 6 indicate that NH 3 D + is a one-dimensional rotor in this solid. The tunneling frequencies of NH 3 D + in a tetrahedral field have been computed using only the first ...
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Thermal behaviour of (NH4)3VO2F4 and Na(NH4)2VO2F4
Thermochimica Acta, 1982Abstract The thermal behaviour of (NH 4 ) 3 VO 2 F 4 and Na(NH 4 ) 2 VO 2 F 4 was investigated using TG, DTA and DSC techniques. The occurrence of a first order phase transition with the onset of decomposition in both the compounds is confirmed. The temperature, energetics and hysteresis of the transition are obtained.
B.R. Wani +3 more
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