A. I. Beskrovnyi, S. G. Vasilovskii, S. B. Vakhrushev, D. A. Kurdyukov, O. I. Zvorykina, A. A. Naberezhnov, N. M. Okuneva, M. Tovar, E. Rysiakiewicz-Pasek, P. Jaguś, “Temperature dependences of the order parameter for sodium nitrite embedded into porous glasses and opals”, Fizika Tverdogo Tela, 2010, Volume 52, Issue 5,Pages <nobr>1021

This article is cited in 11 papers

XX Anniversary Meeting on the Use of Neutron Scattering in Condensed Matter Research (RNICS-2008), Gatchina (October 13-18, 2008)
Functional and nanostructured materials

Temperature dependences of the order parameter for sodium nitrite embedded into porous glasses and opals

A. I. Beskrovnyi^a, S. G. Vasilovskii^a, S. B. Vakhrushev^b, D. A. Kurdyukov^b, O. I. Zvorykina^c, A. A. Naberezhnov^b, N. M. Okuneva^b, M. Tovar^d, E. Rysiakiewicz-Pasek^e, P. Jaguś^e

^a Joint Institute for Nuclear Research, Dubna, Moscow region
^b Ioffe Institute, St. Petersburg
^c St. Petersburg Polytechnic University
^d Helmholtz Centre Berlin, BENSC, Berlin, Germany
^e Institute of Physics, Wrocław University of Technology, Wrocław, Poland

Abstract: The temperature dependences of the order parameter $\eta(T)$ for sodium nitrite NaNO$_2$ embedded in porous glasses with average pore diameters of 320 and 20 nm, as well as in artificial opals, have been investigated. It has been demonstrated that the dependence $\eta(T)$ for sodium nitrite in the porous glass almost coincides with that for the bulk material, whereas this dependence for NaNO$_2$ in opals differs substantially from that observed in the bulk material and from those previously determined for sodium nitrite in porous glasses with average pore diameters of 3 and 7 nm. It has been revealed that the dependence of the order parameter for sodium nitrite in opals exhibits a temperature hysteresis (approximately equal to 8 K). The temperature dependence $\eta(T)$ has been described using a simple model, which takes into account the nanopore diameter distribution existing in artificial opals.