Neutron inelastic scattering from mixed salts [(NH4)xK1−x]2SO4

Chandra, Peeyush; Dasannacharya, B.A.; Goyal, P. S.; Iyengar, P.K.; Rao, K. R.; Thaper, C. L.; Venkatesh, Akilesh

doi:10.1016/0375-9601(76)90127-4

Cited by 9 publications

(1 citation statement)

References 8 publications

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“…It is therefore of interest to systematically examine the role of replacing NH,~ with K +. Results of inelastic scattering experiments at 110°K, in the ferroelectric phase of (NH4)2 SO4 are shown in figure 5 (Chandra et al 1976). The two prominent peaks at 390 and 350 cm-~ are associated with the librational modes of the two ammonium ions NH2 (I) and NH2 (II) in the unit cell (Schlemper and Hamilton 1966).…”

Section: Ferroelectrics Superconductors Metal-hydrogen Systems Hydmentioning

confidence: 98%

Investigation of hydrogenous materials using neutrons

Dasannacharya

Goyal

1984

Bull. Mater. Sci.

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Slow neutrons have proved to be a very powerful probe for examining materials in general and hydrogenous materials in particular. In this article we review various neutron scattering techniques which have been utilised to investigate different aspects of a variety of hydrogenous materials. TranslationaUy as well as orientationally disordered materials, ferroelectrics, superconductors, metal-hydrogen systems, polymers and biological molecules have been chosen as illustrative examples.

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Section: Ferroelectrics Superconductors Metal-hydrogen Systems Hydmentioning

confidence: 98%

Investigation of hydrogenous materials using neutrons

Dasannacharya

Goyal

1984

Bull. Mater. Sci.

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Structural changes of ((NH4)1–xKx)2SO4 crystals

Shamah

Ahmed

Kamel

et al. 1987

Phys. Stat. Sol. (a)

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((NH4)1–xKx)2SO4 powdered crystals with x = 0.0, 0.1, 0.15, 0.25, 0.32, 0.6, 0.7, and 1.0 are studied by X‐ray diffraction from room temperature down to 73 K. It is found that the mixed crystals are isomorphous to (NH4)2SO4 and K2SO4. The phase transition temperature decreases with the increase of the substituted ions (K+). The phase transition completely disappeares when x > 0.6. Lattice parameters as a function of composition are presented, as well as their variation with temperature for each composition. A suggested phase diagram for ((NH4)1–xKx)2SO4 mixed crystal systems is presented.

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