Dielectric properties and X-T phase diagram of mixed K1−x(NH4)xH2PO4crystals

Гриднев, С. А.; Коротков, Л. Н.; Rogova, S. P.; Shuvalov, L. A.; Fedosjuk, R. M.

doi:10.1080/07315179108203323

Cited by 37 publications

(17 citation statements)

References 7 publications

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“…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.…”

Section: Resultsmentioning

confidence: 60%

“…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.…”

Section: Resultsmentioning

confidence: 99%

“…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.…”

Section: Resultsmentioning

confidence: 99%

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

Vanina¹,

Набережнов²,

Алексеева³

et al. 2017

Nanosystems: Phys. Chem. Math.

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Effect of ammonium dihydrogen phosphate admixture on phase transitions 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. The samples have been prepared by embedding of aqueous solutions into porous borosilicate glasses. The X-ray diffraction have shown that the crystal structure at room temperature corresponds to the bulk KDP and the average nanoparticle diameters are 49 (2) nm for the sample with 5 % of (NH 4 )H 2 PO 4 (ADP) and 46 (2) nm for the nanocomposites with 15 % of ADP. Dielectric response data analysis have revealed the shifts of the ferroelectric phase transition temperature as a function of (NH 4 )H 2 PO 4 concentration: at x = 0 ∆T C is equal to ∼6 K, at x = 0.05 ∆T C ∼3 K and at x = 0.15 ∆T C ∼2 K.

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Section: Resultsmentioning

confidence: 60%

Section: Resultsmentioning

confidence: 99%

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

Vanina¹,

Набережнов²,

Алексеева³

et al. 2017

Nanosystems: Phys. Chem. Math.

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“…The existence of structural glass state in the mixed crystals of ADP-KDP was attributed by several researchers and was mainly due to the random freezing of acid protons in the O-H…O hydrogen bonds [17,18]. Most of such works carried out on this system were only with very few compositions of the mixed crystals because of the non-availability of crystals from the complete range of mixing compositions grown with similar experimental conditions [19][20][21][22]. Growth behaviours of ADP-KDP mixed crystals in relation with crystal structure and chemical bonding interactions have been reported recently [23,24].…”

Section: Introductionmentioning

confidence: 97%

Compositional dependence of morphology and lattice parameters during growth of K_1‐x(NH₄)_xH₂PO₄ mixed crystals

Srinivasan¹,

Cantoni²,

Bocelli³

2010

Cryst. Res. Technol.

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Mixed crystals of ammonium dihydrogen phosphate and potassium dihydrogen phosphate K 1-x (NH 4 ) x H 2 PO 4 were grown from aqueous solutions with x = 0. 06, 0.09, 0.15, 0.32, 0.42, 0.51, 0.63, 0.70, 0.76, 0.78, 0.84, 0.88, 0.89 and 0.91. The crystal composition that differs from solution was estimated by X-ray method. Morphology of the crystals changes from tetragonal prism to needles when the incorporation of either of the two components into the other; which also affects the growth rate along the prominent growth directions significantly. Growth along the [001] decreases initially with composition and reached the maximum when x = 0.5; whereas growth along the [100] always showed a decreasing trend with composition and attained a minimum value when x = 0.5. Crystal length along the [001] and [100] and aspect ratio are also compositional dependent. Unit cell parameters determined by X-ray powder and single crystal analyses revealed that the 'a' parameter shows only a small and linear variation but the 'c' parameter changes significantly with ADP incorporation because of the difference in the effective ionic radius of K + and NH 4 + ions and also the possibility of NH 4 + ion to form two different kinds of hydrogen bonds in the system. The existence of a pseudo-cubic cell at the mixing composition x = 0.78 was also revealed.

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“…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.…”

Section: Introductionmentioning

confidence: 99%

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

Vanina¹,

Набережнов²,

Sysoeva³

et al. 2017

Nanosystems: Phys. Chem. Math.

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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 − 10T . 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.

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Dielectric properties and X-T phase diagram of mixed K_1−x(NH₄)_xH₂PO₄crystals

Cited by 37 publications

References 7 publications

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

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

Compositional dependence of morphology and lattice parameters during growth of K_1‐x(NH₄)_xH₂PO₄ mixed crystals

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

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Dielectric properties and X-T phase diagram of mixed K1−x(NH4)xH2PO4crystals

Cited by 37 publications

References 7 publications

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

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

Compositional dependence of morphology and lattice parameters during growth of K1‐x(NH4)xH2PO4 mixed crystals

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

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Product

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About

Dielectric properties and X-T phase diagram of mixed K_1−x(NH₄)_xH₂PO₄crystals

Compositional dependence of morphology and lattice parameters during growth of K_1‐x(NH₄)_xH₂PO₄ mixed crystals