Vol. 40, Issue 2, pp. 305-309

  1. Archive
  2. Optica Applicata Vol. 40, Issue 2, pp. 305-309 (2010)
Vol. 40 Issue 2 pp. 305-309

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

Vladislav Tarnavich, Leonid Korotkov, Olja Karaeva, Alexander Naberezhnov, Ewa Rysiakiewicz-Pasek

Keywords

ferroelectrics, antiferroelectrics, composite material, porous glass, phase transition, dielectric permittivity

Abstract

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.

Vol. 40
Issue 2
pp. 305-309

0.25 MB
OPTICA APPLICATA - a quarterly of the Wrocław University of Science and Technology, Faculty of Fundamental Problems of Technology