First Observation of the Increase in Atomic Mean Square Displacements upon Glass Formation: Inelastic Neutron Scattering Study of K1-x(NH4)xH2PO4Mixed Crystals

Autor:	L. A. Shuvalov, R. M. Fedosyuk, A. V. Belushkin, J. Tomkinson
Rok vydání:	1993
Předmět:	Materials science Hydrogen chemistry Phase (matter) Analytical chemistry General Physics and Astronomy chemistry.chemical_element Inelastic scattering Neutron scattering Glass transition Ferroelectricity Inelastic neutron scattering Ion
Zdroj:	Journal of the Physical Society of Japan. 62:403-406
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.62.403
Popis:	The low-temperature lattice dynamics of K 1- x (NH 4 ) x H 2 PO 4 mixed crystals have been studied using high-resolution inelastic-neutron-scattering on powders for x =0.0; 0.06; 0.1; 0.18; 0.3; 0.6 and 0.9. The influence of ammonium ion concentration on the hydrogen dynamics has been analysed. The mean square displacements of hydrogen bonded acid protons are found to be larger in the glass phase than in the ordered ferroelectric or antiferroelectric phases. It was found that a vibrational mode at 16.8 meV is strongly coupled with the ferroelectric modes. \sloppy
Databáze:	OpenAIRE
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