Structure of aqueous ammonium calcium nitrate glass former studied by neutron diffraction

Autor:	G W Neilson, S Ansell
Rok vydání:	1999
Předmět:	Aqueous solution Hydrogen Chemistry Neutron diffraction Inorganic chemistry Analytical chemistry chemistry.chemical_element Condensed Matter Physics Local structure Calcium nitrate Ion chemistry.chemical_compound Distribution function General Materials Science Ammonium
Zdroj:	Journal of Physics: Condensed Matter. 11:7035-7049
ISSN:	1361-648X 0953-8984
DOI:	10.1088/0953-8984/11/37/301
Popis:	A neutron diffraction experiment was carried out on the glass-forming aqueous system of ammonium calcium nitrate tetrahydrate, ACN (NH4NO3Ca(NO3)24H2O). The method of isotopic substitution was used to determine the local structure round the NO-3 ion, the hydrogen-hydrogen (gHH(r)), the hydrogen-oxygen (gOH(r)), and the nitrogen-hydrogen (gN2H(r)) radial pair distribution functions, in both the glassy (153 K) and liquid (303 K) states. The results show that significant changes occur on glassification. In particular, the nitrate ion exhibits an increase in the number of close hydrogen contacts and enhancement of its local structure. A microstructural model is proposed to explain the strong glass-forming ability of ACN.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::5c9f277f4223178a1a54445eb4ff2f9e https://doi.org/10.1088/0953-8984/11/37/301 Zobrazit plný text záznamu