Reorientational disorder of anions in the hydrogen sulfides of sodium and potassium (NaDS and KDS) investigated by neutron diffraction between T=4 K and T=470 K

Abstract

An inelastic incoherent neutron scattering study of water in small-pored zeolites and other water-bearing minerals Orientational order and rotational dynamics of the amide ions in potassium amide. II. Quasielastic neutron scattering

Dynamics of anions and cations in cesium hydrogensulfide (CsHS, CsDS): Neutron and x-ray diffraction, calorimetry and proton NMR investigations

“…Large-amplitude liberations of DS Ϫ are indicated in a distinct anisotropy of the thermal displacement parameters of deuterium within the whole investigated temperature range. Contrary to the NaCl-typelike compounds NaDS and KDS, which have considerable anharmonicity of the coordination potential of deuterium, 17,19 a harmonic model fits well with the neutron diffraction data of CsDS. This is caused by the two-fold symmetry of the coordination potential of D in CsDS, which is more closely related to an ellipsoid describing the pdf within the harmonic approximation than the three-fold symmetry of the coordination potential of NaDS, KDS, and RbDS.…”

“…We described this procedure in detail in Ref. 17. The momentum transfer of our measurements allows refinement of the coefficients c 41 , c 61 , and c 81 of the related SAF.…”

“…[1][2][3][4][5] The dynamics of the anions were analyzed by the use of IR/Raman spectroscopy, [6][7][8][9] inelastic and quasielastic neutron scattering, [10][11][12] and NMR, [13][14][15][16] but no systematic study of M HS with M ϭNa, K, Rb, Cs to characterize the influence of symmetry and strength of the coordination potential on the dynamics of the anions has been presented. This paper is a part of a series [17][18][19][20] focusing on the structure and the dynamics in these compounds. We used powder 17 and single crystal 19 neutron diffraction, quasielastic neutron scattering, 18 and 1 H-NMR 20 to study the hydrogensulfides of sodium, potassium, and rubidium.…”

“…This paper is a part of a series [17][18][19][20] focusing on the structure and the dynamics in these compounds. We used powder 17 and single crystal 19 neutron diffraction, quasielastic neutron scattering, 18 and 1 H-NMR 20 to study the hydrogensulfides of sodium, potassium, and rubidium. In this paper we present results regarding the hydrogensulfide of cesium, including neutron and x-ray diffraction, calorimetric investigations, second moments (M 2 ) of the NMR proton absorption signal and the NMR spin-lattice relaxation times (T 1 ) of the protons.…”

New directions for hydrogen storage: sulphur destabilised sodium aluminium hydride

“…3(a)). This peak corresponds to the high-temperature cubic phase of NaHS that is stable above $92 C. 21 However, the quality of the data and the high degree of peak overlap with other phases makes this assignment tentative. The NaHS peak continues to grow until the a-phase disappears at 147 C. The b-phase and NaHS begin to decompose at 150 C with NaHS completely decomposed by 157 C. The b-phase continues to slowly decrease in intensity and disappears by 184 C where peaks from g begin to form.…”