Nature of Ferroelectricity in KN<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math>

Chen, Arthur; Chernow, F.

doi:10.1103/physrev.154.493

Cited by 85 publications

(34 citation statements)

References 22 publications

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“…The observed hysteresis between the curves measured during heating and cool ing is caused by the first order phase transition. The double steps, which are seen in the dependences ε 1 (T) obtained during the cooling of all three samples, can be explained by the formation of an intermediate fer roelectric phase [19]. The temperature, at which the curves obtained during heating and cooling converge, corresponds to the end of the structural phase transi tion III II.…”

Section: Measurements Of the Linear Dielectric Permittivitymentioning

confidence: 96%

“…Phase III is ferroelectric with the spontaneous polarization along the c axis. The spontaneous polarization is approximately equal to 8-10 μC/cm 2 at a temperature of 393 K [19]. It was found that the temperature range of the existence of the ferroelectric state in KNO 3 depends on the thermal prehistory and cooling rate [20,21] and, when the sample is preliminarily heated to 473 K, for the first heating-cooling cycle, it is approximately equal to 24 K.…”

Section: Sample Preparation and Experimental Techniquementioning

confidence: 98%

“…Bulk potassium nitrate at room temperature and atmospheric pressure has an orthorhombic structure (space group Pmcn) [19]. This phase is often referred to as phase II.…”

Section: Sample Preparation and Experimental Techniquementioning

confidence: 99%

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Dielectric and calorimetric investigations of KNO3 in pores of nanoporous silica matrices MCM-41

et al. 2012

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The temperature dependences of the linear dielectric permittivity, the third harmonic amplitude, and the heat capacity of nanoporous silica matrices MCM 41 with cellular channels (3.7 and 2.6 nm in diam eter) filled with KNO 3 have been investigated in comparison with those obtained for bulk potassium nitrate. Measurements have been performed during heating and cooling in the range from room temperature to 463 K. Anomalies corresponding to structural phase transitions have been observed. A significant broadening of the temperature region of the existence of the ferroelectric phase III of potassium nitrate upon cooling has been revealed. This broadening increases with a decrease in the size of pores. It has been shown that, in the nanocomposites with potassium nitrate, the ferroelectric phase can also be formed during heating. The effi ciency of observation of the third harmonic generation for studying nanocomposites with the ferroelectric phase has been demonstrated.

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Section: Measurements Of the Linear Dielectric Permittivitymentioning

confidence: 96%

Section: Sample Preparation and Experimental Techniquementioning

confidence: 98%

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Dielectric and calorimetric investigations of KNO3 in pores of nanoporous silica matrices MCM-41

et al. 2012

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“…For the bulk KNO 3 crystals, ferroelectric phase is observed only when cooling at atmospheric pressure in the temperature range from 383 K to 398 K [2,3]. Lower dimensions of the KNO 3 lead to distinct and unusual anomalies of physical properties compared to the bulk material.…”

Section: Introductionmentioning

confidence: 98%

Ferroelectric phase transitions in KNO3 embedded into porous glasses

Poprawski

Rysiakiewicz-Pasek

Sieradzki

et al. 2007

Journal of Non-Crystalline Solids

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“…Although the ferroelectric character comes from a collective phenomenon which forces all the displacive atoms to settle into equivalent sites, an essential feature of this phenomenon is the instability of the ion at the center of symmetry. [39][40][41] It is not necessary for these unstabilizing forces to dominate in order to produce appreciable low-temperature anharmonicity. If the forces are nearly equal when the ferrous ion is at the center of symmetry, the ion may move in a very weak potential near the cell center, but in a stronger force field near the chloride ions.…”

Section: Low-temperature Anharmonicity In Fecl 2 and Other Materialsmentioning

confidence: 99%

Low-Temperature Anharmonicity in FeCl2

Johnson

Dash

1968

Phys. Rev.

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Mossbauer spectra of Fe 57 in thin anhydrous ferrous chloride powdered absorbers have been investigated at several temperatures between 300 and 10°K. The quadrupole splitting, velocity shift, and Mossbauer fraction have been determined. The Mossbauer fraction of FeCl2 shows an anomalously weak temperature dependence which cannot be explained by any harmonic model for the interatomic forces or by the usual hightemperature anharmonicity. This anomalous behavior implies a low-temperature anharmonicity which is qualitatively explained in terms of the relative sizes of the ions involved. The interpretation is consistent with the finding of essentially harmonic behavior for FeF2. The results of our reexamination of other Mossbauer / studies are also consistent with these size arguments.

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Nature of Ferroelectricity in KNO3

Cited by 85 publications

References 22 publications

Dielectric and calorimetric investigations of KNO3 in pores of nanoporous silica matrices MCM-41

Dielectric and calorimetric investigations of KNO3 in pores of nanoporous silica matrices MCM-41

Ferroelectric phase transitions in KNO3 embedded into porous glasses

Low-Temperature Anharmonicity in FeCl2

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