Novel KDP-ADP Nanocomposites

Abstract

The influence of the size effect on the features of ADP-KDP-porous glasses composites was studied. The dielectric permittivity results of mixed ADP and KDP embedded into porous glasses with different average pore sizes in a wide temperature range are presented. The data obtained indicate that pore size affects the nature of the dielectric anomaly in the vicinity of phase transition regions.

“Restricted Geometry” Effect on Phase Transitions in KDP, ADP, and CDP Nanocrystals

“…For example, the experimental study of the dielectric properties of KDP in porous structures with pore dimensions D = 7-100 nm demonstrate that a decrease in the pore diameter leads to a monotonous increase in the TC. At the same time, the nonmonotonic behavior of the TC(D) dependence was revealed in references [10,11] on the basis of dielectric and dilatometric measurement results.…”

“…An influence of the pore size on the phase transition temperature in KDP and ADP particles, embedded in porous matrices, has already been discussed [8][9][10][11]13]. However, experimental results obtained by different authors contain some contradictions.…”

“…Alongside this, potassium dihydrogen phosphate [8][9][10][11][12][13], Rochelle salt [14,15], and triglycine sulfate [14,[16][17][18][19], in contrast, are characterized by an increase of ferroelectric phase transition temperature under "restricted geometry" conditions. However the data on the magnitude of T C shifting as a function of the matrix mean that the pore diameter varied significantly for different researchers.…”