Phase Transitions in Mixed Crystal System K1-x(NH4)xH2PO4

Ono, Yasuhiro; Hikita, T.; Ikeda, T.

doi:10.1143/jpsj.56.577

Cited by 71 publications

(38 citation statements)

References 23 publications

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“…It becomes larger and sharper with lowering x. Such a behavior of ε 33 (T, ν) was observed in [17], and K 1−x (NH 4 ) x H 2 PO 4 [22,23,54,55].…”

Section: The Ferroelectric Phase Composition Regionmentioning

confidence: 55%

“…Using the experimental data for transverse dielectric permittivity of [17], and K 1−x (NH 4 ) x H 2 PO 4 [19,22,60] it has been established that ε 11 (T, ν) in antiferroelectric phase composition region at T > T N (x), just like in the glass and ferroelectric phase composition region, increases with lowering temperature, but the value of ε 11 (T, ν) here is somewhat larger. Near T N (x) a fast decrease of ε 11 (T, ν) takes place, which at x → 1 transforms into a break.…”

Section: Antiferroelectric Phase Composition Regionmentioning

confidence: 94%

“…Experimental measurements of the dielectric permittivity of Rb 1−x (NH 4 ) x H 2 PO 4 [1][2][3][4][5][6][7][8], Rb 1−x (ND 4 ) x D 2 PO 4 [7,[9][10][11][12][13][14], Rb 1−x (NH 4 ) x H 2 AsO 4 [15][16][17][18], and K 1−x (NH 4 ) x H 2 PO 4 [19][20][21][22][23] in the glass phase composition region have shown that the temperature curves of the longitudinal ε 33 (T, ν) and transverse ε 11 (T, ν) permittivities are qualitatively similar. At high temperatures the real parts of the permittivities are roughly described by the Curie-Weiss law.…”

Section: Glass Phase Composition Regionmentioning

confidence: 99%

“…The averaged matrices of the second derivatives F [11] c ; F [22] c for the antiferroelectric phase are of the same symmetry as the matrixφ , and the eigenvalues of these matricesF [11] µ ;F [22] µ are written as linear combinations similar toφ µ . Symmetry of the matrix F [21] c is the same as ofq ; after the unitary transformation it becomes analogous to the antidiagonal matrixq with the corresponding elementsF [21] µ .…”

Section: -13mentioning

confidence: 99%

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Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Sorokov¹,

Levitskii²,

Vdovych³

2010

Condens. Matter Phys.

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The cluster pseudospin model of proton glasses, which takes into account the energy levels of protons around the PO 4 group, the long-range interactions between the hydrogen bonds, and an internal random deformational field is used to investigate thermodynamical characteristics, longitudinal and transverse dielectric permittivities of Rb 1−x (ND 4 )xD 2 PO 4 and Rb 1−x (NH 4 )xH 2 AsO 4 compounds. A review of experimental and theoretical works on the Rb 1−x (NH 4 )xH 2 PO 4 type crystals is presented.

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“…It becomes larger and sharper with lowering x. Such a behavior of ε 33 (T, ν) was observed in [17], and K 1−x (NH 4 ) x H 2 PO 4 [22,23,54,55].…”

Section: The Ferroelectric Phase Composition Regionmentioning

confidence: 55%

Section: Antiferroelectric Phase Composition Regionmentioning

confidence: 94%

Section: Glass Phase Composition Regionmentioning

confidence: 99%

Section: -13mentioning

confidence: 99%

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Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Sorokov¹,

Levitskii²,

Vdovych³

2010

Condens. Matter Phys.

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“…In recent years, some measurements in the KADP crystals have been made [1][2][3][4][5][6][7][8]. The glass state of K 1−x (NH 4 ) x H 2 PO 4 occurs in the range of the concentration 0.25 < x < 0.65 [1,7,8].…”

Section: Introductionmentioning

confidence: 99%

Dielectric Properties of K_1-x(NH₄)_xH₂PO₄(x= 0.095) Crystal

Kaszyński¹,

Трыбула²,

Małuszyńska³

2005

Acta Phys. Pol. A

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Temperature dependences of the dielectric permittivity were studied for the ferroelectric K1−x(NH4)xH2PO4 mixed crystal. The experiments revealed presence of the beginning of the dipolar glass -embryos in the concentration of ammonium x = 0.095. Observations of the dielectric relaxations show much bigger effect domain mechanism than the one related to the growth of clusters of the dipolar glass.

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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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Phase Transitions in Mixed Crystal System K_1-x(NH₄)_xH₂PO₄

Cited by 71 publications

References 23 publications

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Dielectric Properties of K_1-x(NH₄)_xH₂PO₄(x= 0.095) Crystal

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

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Phase Transitions in Mixed Crystal System K1-x(NH4)xH2PO4

Cited by 71 publications

References 23 publications

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Thermodynamics, dielectric permittivity and phase diagrams of the Rb_{1-x}(NH_{4})_{x}H_{2}PO_{4} type proton glasses

Dielectric Properties of K1-x(NH4)xH2PO4(x= 0.095) Crystal

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

Contact Info

Product

Resources

About

Phase Transitions in Mixed Crystal System K_1-x(NH₄)_xH₂PO₄

Dielectric Properties of K_1-x(NH₄)_xH₂PO₄(x= 0.095) Crystal

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