A microscopic theory of the phase transitions in Me(NH3)6(AB4)2-type compounds

Otwinowski, M.; Stankowski, J.

doi:10.1016/0378-4363(84)90030-5

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1985

1988

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Cited by 3 publications

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“…The general formula for the salts is [Me(NH3)6]X2, where Me is a divalent transition-metal cation, and X a more or less complicated single charged anion: C1, Br, I, NO3, BF4, C104, PF 6 . It is commonly believed, that the phase transitions in these compounds are associated at least with an ordering of the ammonia group [4,5]. At the present time there are, however, only a few structural results available to support the theory of these phenomena.…”

Section: Introductionmentioning

confidence: 94%

Orientational disorder in nickel(II)hexammine nitrate

et al. 1985

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We calculate from X-ray and neutron single crystal Bragg intensities the orientational density as well as the rotational potential for the disordered NO a molecule. Reorientation occurs most likely by 109 ~ jumps of NO 3 . The NH 3 molecules are also disordered. We observe a proton density with a four fold symmetry. Both kinds of molecules were analysed with continuous density as well as with Frenkel models.

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Section: Introductionmentioning

confidence: 94%