Dynamics of the amide ions in potassium amide: Orientational order and disorder

M. Müller; B. Asmussen; W. Press; J. Senker; H. Jacobs; H. Büttner; W. Kockelmann; R. M. Ibberson

doi:10.1016/S0921-4526(96)00873-3

Dynamics of the amide ions in potassium amide: Orientational order and disorder

M. Müller, B. Asmussen, W. Press, J. Senker, H. Jacobs, H. Büttner, W. Kockelmann, R. M. Ibberson

Research output: Contribution to journal › Article › peer-review

6 Scopus citations

Abstract

In the ionic compound potassium amide (KNH₂) the amide ions (NH^-₂) are displaying orientational disorder in the tetragonal and cubic high-temperature phases while they are orientationally ordered in the monoclinic low-temperature phase. From high-resolution neutron powder diffraction measurements in all three phases of KND₂ the time-averaged probability density function of the deuterons was determined in detail. Information on the amide dynamics is provided by quasielastic incoherent neutron scattering experiments. Models for the reorientational processes, their time scales, and the respective activation energies were deduced from the data. The elastic incoherent structure factor suggests a time-averaged density distribution in very good agreement with the results of the diffraction experiments.

Original language	English
Pages (from-to)	45-47
Number of pages	3
Journal	Physica B: Physics of Condensed Matter
Volume	234-236
DOIs	https://doi.org/10.1016/S0921-4526(96)00873-3
State	Published - Jun 2 1997
Externally published	Yes

Funding

This work was supported by the German Bundesministerium fiir Bildung und Wissenschaft (BMBW) under grant no. PR3-KIE.

Funders	Funder number
BMBW	PR3-KIE
German Bundesministerium fiir Bildung und Wissenschaft

Keywords

Order-disorder transition
Powder diffraction
Quasielastic scattering

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10.1016/S0921-4526(96)00873-3

Cite this

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title = "Dynamics of the amide ions in potassium amide: Orientational order and disorder",

abstract = "In the ionic compound potassium amide (KNH2) the amide ions (NH-2) are displaying orientational disorder in the tetragonal and cubic high-temperature phases while they are orientationally ordered in the monoclinic low-temperature phase. From high-resolution neutron powder diffraction measurements in all three phases of KND2 the time-averaged probability density function of the deuterons was determined in detail. Information on the amide dynamics is provided by quasielastic incoherent neutron scattering experiments. Models for the reorientational processes, their time scales, and the respective activation energies were deduced from the data. The elastic incoherent structure factor suggests a time-averaged density distribution in very good agreement with the results of the diffraction experiments.",

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doi = "10.1016/S0921-4526(96)00873-3",

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TY - JOUR

T1 - Dynamics of the amide ions in potassium amide

T2 - Orientational order and disorder

AU - Müller, M.

AU - Asmussen, B.

AU - Press, W.

AU - Senker, J.

AU - Jacobs, H.

AU - Büttner, H.

AU - Kockelmann, W.

AU - Ibberson, R. M.

PY - 1997/6/2

Y1 - 1997/6/2

N2 - In the ionic compound potassium amide (KNH2) the amide ions (NH-2) are displaying orientational disorder in the tetragonal and cubic high-temperature phases while they are orientationally ordered in the monoclinic low-temperature phase. From high-resolution neutron powder diffraction measurements in all three phases of KND2 the time-averaged probability density function of the deuterons was determined in detail. Information on the amide dynamics is provided by quasielastic incoherent neutron scattering experiments. Models for the reorientational processes, their time scales, and the respective activation energies were deduced from the data. The elastic incoherent structure factor suggests a time-averaged density distribution in very good agreement with the results of the diffraction experiments.

AB - In the ionic compound potassium amide (KNH2) the amide ions (NH-2) are displaying orientational disorder in the tetragonal and cubic high-temperature phases while they are orientationally ordered in the monoclinic low-temperature phase. From high-resolution neutron powder diffraction measurements in all three phases of KND2 the time-averaged probability density function of the deuterons was determined in detail. Information on the amide dynamics is provided by quasielastic incoherent neutron scattering experiments. Models for the reorientational processes, their time scales, and the respective activation energies were deduced from the data. The elastic incoherent structure factor suggests a time-averaged density distribution in very good agreement with the results of the diffraction experiments.

KW - Order-disorder transition

KW - Powder diffraction

KW - Quasielastic scattering

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DO - 10.1016/S0921-4526(96)00873-3

M3 - Article

AN - SCOPUS:0031548172

SN - 0921-4526

VL - 234-236

SP - 45

EP - 47

JO - Physica B: Physics of Condensed Matter

JF - Physica B: Physics of Condensed Matter

ER -

Dynamics of the amide ions in potassium amide: Orientational order and disorder

Abstract

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Keywords

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