Phase diagram for K$_{1-x}$(NH$_4$)$_{(x)}$H$_2$PO$_4$ ($x$ = 0 – 0.15) solid solutions embedded into magnetic glasses

Effect of magnetic field application on phase transition in nanostructured solid solutions $(1-x)$KH$_2$PO$_4$-$(x)$(NH$_4$)H$_2$PO$_4$ at $x$ = 0, 0.05 and 0.15 has been studied by dielectric spectroscopy at $B$ = 0 – 10 $T$. The samples have been prepared by impregnation of magnetic porous glasses by KDP-ADP solid solutions. The average pore diameter in glasses was 50(5) nm. The temperatures of the ferroelectric phase transition have been determined, and the phase diagrams for these nanocomposite materials (NCM) on cooling and heating (including at magnetic field application) were constructed. The interface “matrix-nanoparticles” was shown to play the principal role in phase diagram formation.