Published 1997 | Version v1
Book Metadata-only

Study of ammonia dynamics in mixed crystals K1-x(NH4)xHal (Hal = Cl, Br, I) by the inelastic neutron scattering

Creators

  • 1. Lab. Nejtronnoj Fiziki im. I.M. Franka, OIYaI, Dubna (Joint Institute for Nuclear Research (JINR))

Description

The investigation of the dynamics of ammonium ion in the disordered α-phase of mixed crystals K1-x(NH4)xHal (Hal = Cl, Br, I) is carried out by the inelastic incoherent neutron scattering (IINS) method. IINS spectra are measured in the 2-200 meV energy range and the 10-300 K temperature range by the time-of-flight method. The generalized densities of phonon states are defined in the single-phonon approximation. It is found out that the libration mode of ammonium ion has the weak concentration dependence. Resonant modes are observed at low temperature for all concentration range of the existence of the disordered α-phase. The broadening of resonant modes at the expensive of the jump rotation diffusion of ammonium ions takes place at temperature above 10 K

Abstract (Russian)

Методом неупругого некогерентного рассеяния нейтронов (ННРН) проведено исследование динамики иона аммония в неупорядоченной α-фазе смешанных кристаллов K1-x(NH4)xHal (Hal = Cl, Br, I). Измерения спектров ННРН в области энергий от 2 до 200 мэВ выполнены в температурном интервале от 10 до 300 К методом времени пролета. Определены обобщенные плотности фононных состояний в однофотонном приближении. Установлено, что либрационная мода иона аммония имеет слабо выраженную концентрационную зависимость. Резонансные моды наблюдаются при низкой температуре во всей концентрационной области существования неупорядоченной α-фазы. Уширение резонансных мод за счет прыжковой ротационной диффузии ионов аммония происходит при температуре выше 10 К
Part of:
National conference on the application of X-rays, synchrotron radiation, neutrons and electrons for materials study (the continuation of All-Union Meetings on the application of X-rays for materials research). Summary of reports. Volume 3

Additional details

Additional titles

Original title (Russian)
Исследование динамики аммония в смешанных кристаллах К

Publishing Information

Publisher
OIYaI
Imprint Place
Dubna (Russian Federation)
ISBN
5-85165-483-X
Imprint Title
National conference on the application of X-rays, synchrotron radiation, neutrons and electrons for materials study (the continuation of All-Union Meetings on the application of X-rays for materials research). Summary of reports. Volume 3
Imprint Pagination
370 p.
Journal Page Range
p. 25-30

Conference

Title
National conference on the application of X-rays, synchrotron radiation, neutrons and electrons for materials study (the continuation of All-Union Meetings on the application of X-rays for materials research)
Original Conference Title
Natsional'naya konferentsiya po primeneniyu rentgenovskogo, sinkhrotronnogo izluchenij, nejtronov i ehlektronov dlya issledovaniya materialov (prodolzhenie Vsesoyuznykh soveshchanij po primeneniyu rentgenovskikh luchej dlya issledovaniya materialov)
Dates
25-29 May 1997
Place
Dubna (Russian Federation)

INIS

Country of Publication
Russian Federation
Country of Input or Organization
Russian Federation
INIS RN
33025827
Subject category
S75: CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY;
Resource subtype / Literary indicator
Conference, Numerical Data
Descriptors DEI
AMMONIA; AMMONIUM HALIDES; CONCENTRATION RATIO; EXPERIMENTAL DATA; INELASTIC SCATTERING; LATTICE VIBRATIONS; LINE BROADENING; MILLI EV RANGE; NEUTRON DIFFRACTION; NEUTRON SPECTROSCOPY; OSCILLATION MODES; PHONONS; SOLID SOLUTIONS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K
Descriptors DEC
AMMONIUM COMPOUNDS; COHERENT SCATTERING; DATA; DIFFRACTION; DISPERSIONS; ENERGY RANGE; HALIDES; HALOGEN COMPOUNDS; HOMOGENEOUS MIXTURES; HYDRIDES; HYDROGEN COMPOUNDS; INFORMATION; MIXTURES; NITROGEN COMPOUNDS; NITROGEN HYDRIDES; NUMERICAL DATA; QUASI PARTICLES; SCATTERING; SOLUTIONS; SPECTROSCOPY; TEMPERATURE RANGE

Optional Information

Notes
18 refs., 4 figs., 3 tabs. Imprint:Natsional'naya konferentsiya po primeneniyu rentgenovskogo, sinkhrotronnogo izluchenij, nejtronov i ehlektronov dlya issledovaniya materialov (prodolzhenie Vsesoyuznykh soveshchanij po primeneniyu rentgenovskikh luchej dlya issledovaniya materialov). Sbornik dokladov. Tom 3
Secondary number(s)
JINR-R--14-97-343