2001/11/21 by Charbel Tengroth, Jan Swenson, A. Isopo +1 · 1 citation
Materials Science · #Glass properties and applications #Material Dynamics and Properties #Solid-state spectroscopy and crystallography
paper · doi:10.1103/physrevb.64.224207
openalex publication_date 2001/11/21 · openalex created_date 2016/06/24 · openalex updated_date 2026/06/11
We have investigated the structure of a model fragile glass former Ca0.4K0.6(NO3)1.4(CKN) by using neutron and x-ray diffraction and reverse Monte Carlo modeling in a temperature range covering the glass transition. The results show that the structure of the glass phase contains, in addition to short-range charge ordering, intermediate-range ordering that is due to fluctuation of nitrate ion concentration in the range 3--15 \AA. Furthermore, the nitrate ions are orientationally correlated and form chainlike substructures. Gradual changes of the structure factor were observed in the Q range 1--5 \mathrm\AA^\mathrm\ensuremath-1 on passing through the glass transition temperature, which can partly be attributed to changes in density. However, the orientational correlation between the planar NO3^\ensuremath- ions present in the glass phase is lost in the liquid phase.