High-Temperature Phase Transition in KH2PO4

Blinc, R.; Dimic, V.; Kolář, D.; Lahajnar, G.; Stepišnik, Janez; Žumer, S.; Vene, N.; Hadži, D.

doi:10.1063/1.1669990

Cited by 85 publications

(16 citation statements)

References 5 publications

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“…In figure 2b, the TGA and DTA curves of pure potassium dihydrogen phosphate, (KH 2 PO 4 ) are presented. The peaks in the DSC curve below 200 °C have previously been identified as due to a phase transition involving the onset of disordered hindered rotation of H 2 PO 4 groups around all three axes [23]. It is also observed that at higher temperatures, approximately above 200 °C, the DTA curve bends downwards indicating thermal decomposition of KDP as previously reported earlier [24].…”

Section: Resultsmentioning

confidence: 58%

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Shenoy¹,

Bangera

Shivakumar

2010

Cryst. Res. Technol.

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The investigations on the formation of mixed crystals of ammonium dihydrogen orthophosphate (ADP) and potassium dihydrogen orthophosphate (KDP) i.e. potassium ammonium dihydrogen phosphate, K 1-x (NH 4 ) x H 2 PO 4 have been presented in this paper. Pure and mixed crystals of ADP and KDP have been grown by slow evaporation technique from the supersaturated solution at an ambient temperature 26±1 °C for ammonium concentration x in the range 0.0 ≤ x ≤ 1.0 in the case of mixed crystals. Crystal compositions were determined by flame atomic absorption spectroscopy and chemical analysis. The results of the X-ray analysis of the grown crystals are also reported. Thermogravimetric analysis (TGA) and differential thermal analysis (DTA) were used to study the kinetic process of dehydration and the high temperature phase behaviour. DTA showed the distinct thermal events attributed to dehydration of ADP, KDP and K 1-x (NH 4 ) x H 2 PO 4 . The results of thermal analysis and chemical analysis are consistent with each other.

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Section: Resultsmentioning

confidence: 58%

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Shenoy¹,

Bangera

Shivakumar

2010

Cryst. Res. Technol.

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“…The aim of our work is to obtain more insight into the relaxation behaviour of KDP, in which the rotation of the 2 4 H PO − radicals has been claimed to be important [5]. If the complex permittivity representation of measured dielectric data is used a relaxation is detected as a step in the real part and a peak in the imaginary part of the permittivity.…”

Section: Nhmentioning

confidence: 99%

Dielectric relaxation of KH₂PO₄ above room temperature

Diosa¹,

Vargas

Albinsson

et al. 2004

Physica Status Solidi (b)

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The dispersion curves of the dielectric response of KH 2 PO 4 were obtained from 5 Hz to 13 MHz and over the temperature range 120 -206 °C for both single crystal and polycrystalline samples. Both types of samples reveal dielectric relaxation at low frequency, for example around 10 4 Hz at 140 °C, which shifts to higher frequencies (~1 MHz) as the temperature increases. The relaxation frequency was determined from the peak obtained in the imaginary part of the permittivity as well as from the derivative of the real part of the permittivity. The activation energy E a = 0.82 eV, obtained from the relaxation frequency is very close to that derived from the dc conductivity. We suggest that this dielectric relaxation could be due to the proton jump and phosphate reorientation that causes distortion and change the local lattice polarizability inducing dipoles like 2 4 H PO − .

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“…Relaxation time data for we~ker shocks were collected with a thin-film resistance thermometer mounted flush in the end wall; both a bare platinum film and a platinum film insulated with about 8000 1 of SiOz were used. 3 Typical experimental records of wall pressure and temperature are shown in Fig. 1.…”

Section: Ionization Relaxation Time Measurements In Neonmentioning

confidence: 99%

Investigation of the High Temperature Phase Transition in RbH2PO4 by Scattering of Cold Neutrons

Efron

Pelah

Vulkan

et al. 1971

The Journal of Chemical Physics

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High-Temperature Phase Transition in KH2PO4

Cited by 85 publications

References 5 publications

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Dielectric relaxation of KH₂PO₄ above room temperature

Investigation of the High Temperature Phase Transition in RbH2PO4 by Scattering of Cold Neutrons

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High-Temperature Phase Transition in KH2PO4

Cited by 85 publications

References 5 publications

Growth and thermal studies on pure ADP, KDP and mixed K1‐x(NH4)xH2PO4 crystals

Growth and thermal studies on pure ADP, KDP and mixed K1‐x(NH4)xH2PO4 crystals

Dielectric relaxation of KH2PO4 above room temperature

Investigation of the High Temperature Phase Transition in RbH2PO4 by Scattering of Cold Neutrons

Contact Info

Product

Resources

About

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Growth and thermal studies on pure ADP, KDP and mixed K_1‐x(NH₄)_xH₂PO₄ crystals

Dielectric relaxation of KH₂PO₄ above room temperature