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Effect of restricted geometry on structural phase transitions in KH2PO4 and NH4H2PO4 crystals

Tarnavich V., Korotkov L., Karaeva O., Naberezhnov A., Rysiakiewicz-Pasek E.

Optica Applicata

2010

Vol. 40, nr 2

305--309

The dielectric response of crystalline NH4H2PO4 and KH2PO4–SiO2 and NH4H2PO4–SiO2 composites prepared by embedding salts into porous glasses with the average pore diameter of 320 nm has been studied at the temperature range of 85–300 K. An increase of the structure phase transition temperatures in embedded salts has been observed, which is supposedly due to tensile deformations of embedded crystalline particles. The antiferroelectric phase transition in confined ADP particles becomes diffuse in the temperature region around 10 K.

Dynamical heterogeneity of NaNO2 confined within porous glasses

Dvornikov V., Korotkov L., Naberezhnov A., Fokin A., Korotkova T.

Optica Applicata

2008

Vol. 38, nr 1

25-29

Frequency dependences of imaginary part of the dielectric response e(f) of SiO2-NaNO2 nanocomposite, prepared by embedding of sodium nitrite into porous glasses with 7 nm average pore diameter, have been studied within a temperature range of 360-520 K. It has been found that the spectrum S(omega) = e(f)/f contains the component ~1/f alfa where alfa is a coefficient indicating the dynamical heterogeneity of dipoles. Peculiarities of the temperature dependence of alfa are discussed.