Transitions to the relaxor and dipole-glass states in mixed crystals of the potassium dihydrogen phosphate family

Phase transitions in nanostructured K1-x(NH4)(x)H2PO4 (x = 0 – 0.15) solid solutions

“…Simultaneously the temperature hysteresis ∆T C decreases with increased ADP concentration. The obtained results in comparison with literature data [6][7][8][9][10][11] for the bulk KADP are presented in Table 1.…”

“…For the bulk KADP the strong tendency of decreasing of T C at increasing of APD concentration [9][10][11] exists, but the detail phase diagram stays ambiguous because the properties of bulk KADP essentially depend on preparation methods [12]. Concerning the thermal hysteresis value ∆T C in the position of T C on cooling and on heating, this factor remains unexplored until now.…”

“…At RT the [6][7][8][9][10][11] Present work KADP nanoparticles crystal structure of KADP embedded into the pores corresponds to the bulk structure. The average nanoparticle diameters are equal to ∼53(5) nm for the pure KDP nanoparticles, 49(2) nm for the sample with 5 % of ADP and 46(2) nm for 15 % of ADP.…”

Phase diagram for K(1-x)(NH4)(x)H2PO4 (x = 0 - 0.15) solid solutions embedded into magnetic glasses

“…These glasses have positive linear and volume magnetostriction coefficients [3] and can be named "active host matrix" as they can participate in modification of macroscopic properties of embedded materials due to the appearance of additional strains on the interface "matrix-nanoparticle" upon magnetic field application. The phase diagram for the bulk KH 2 PO 4 (KDP) and (NH 4 )H 2 PO 4 (ADP) solid solutions (KADP) are known [4,5] and it is shown that a small admixture of ADP leads to a drastic decreasing of the ferroelectric phase transition temperature T C . In previous work [6] we studied the effect of restricted geometry on this phase transition for NCM based on conventional porous glasses (PG) with KADP at low ADP concentrations.…”

Amplitude dependences of dielectric permittivity and dielectric losses in a mixed K0.88(NH4)0.12H2PO4 crystal

“…It is known [1] that in some solid solutions of potassium-ammonium dihydrophosphate (K 1 ⎯ x (NH 4 ) x H 2 PO 4 ), the transition from the paraelectric to the ferroelectric phase occurs through an intermediate heterogeneous state. X ray diffrac tion analysis of crystals of the related system Rb 1 ⎯ x (NH 4 ) x H 2 PO 4 shows that this state is character ized by the coexistence of fairly large polar regions and randomly distorted (frustrated) regions of the paraelectric phase [2].…”