Some Studies on Ferroelectricity in KNO<sub>3</sub>and Related Compounds

Yanagi, Taketoshi

doi:10.1143/jpsj.20.1351

Cited by 45 publications

(11 citation statements)

References 28 publications

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“…(The phase III exhibits ferroelectric properties [7].) Infrared [8,9] and Raman spectra [10] of KNO 3 have been measured, in order to study the lattice dynamics of the dierent phases.…”

Section: Introductionmentioning

confidence: 99%

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃

2015

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Optical, micro-structural, thermal and electrical properties of the investigated potassium nitrate (KNO3) samples were characterized by various techniques such as X-ray analysis, scanning electron microscopy, UV-VIS-NIR absorption and dierential scanning calorimetry. The presence of structural phase transition is checked by dierential scanning calorimetry, electrical and X-ray analysis measurement. The thermal energy required for such transformation is calculated and found to be 46.2 J/g. The activation energies of the electrical conduction for KNO3 were found to be 0.236 eV for phase II and 0.967 eV for phase I. The optical band gaps of KNO3 for the higher photon energy are calculated and equal to 5.03 and 5.01 eV for II and I phases, respectively and at lower photon energy, the values are equal to 3.84 and 3.80 eV for II and I phases, respectively. The data which leads to the interpretation of electronic spectra of potassium nitrate is possible to assume that the long wavelength part of absorption band corresponds to nπ * transition. Then, the short-wavelength part is probably due to the transition in a higher excited state of symmetry ππ * . The mean values of crystalline sizes are determined by scanning electron microscopy analysis. Such information can considerably aid in understanding the process of transformations near the phase crystal modications at 129

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“…(The phase III exhibits ferroelectric properties [7].) Infrared [8,9] and Raman spectra [10] of KNO 3 have been measured, in order to study the lattice dynamics of the dierent phases.…”

Section: Introductionmentioning

confidence: 99%

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃

2015

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“…[9].Since then, its ferroelectric [10], dielectric [11] and structural [12] properties have been investigated. In a recent theoretical study, KNO 3 has been found to exist in a variety of phases [13][14][15]. Upon heating, its crystal structure changes from orthorhombic (phase II) to rhombohedral (phase I) and upon cooling, its phase I changes first to phase III at about 124℃ and then to phase II at about 110℃ [1].…”

Section: Materials and Its Propertiesmentioning

confidence: 99%

Investigations of Ferroelectric Polarization Switching in Potassium Nitrate Composite Films

Kumar¹,

Nath²

2014

Transactions on Electrical and Electronic Materials

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This article explains the experimental results of ferroelectric polarization switching (FPS) of potassium nitrate (KNO 3) with different polymers such as polyvinylidene fluoride (PVDF) and polyvinyl fluoride (PVF) using simple melt-press techniques. To analyze the ferroelectric polarization switching in potassium nitrate (KNO 3) composite films at room temperature, we applied the Ishibashi and Takagi theory (based on Avrami model) to the switching current transient. To investigate the dimensionality of domain growth, the ferroelectric polarization switching current (FPS current) was observed from the square-wave bipolar signals across a resistance of 0.1 kΩ in series with the composite films. The existence of a switching current transient pulse confirmed the ferroelectricity and indicated the stability of the ferroelectric phase (phase III) of KNO 3 at room temperature. Polarization hysteresis (P-E) characteristics supported the prominent features of ferroelectric polarization switching in the composite films at room temperature.

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“…2135. Therefore, ammonium sulphate first crystallises from the solution upon cooling (Yanagi, 1965(Yanagi, , pp. 1351.…”

Section: Testing Of Prilled Fertilisersmentioning

confidence: 99%

Caking And Degradation Problem on Nitrogenous Fertiliser and Alternative Solution Processes

Gezerman¹,

Çorbacıoğlu²

2011

IJC

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Toward the end of the 1950s, the development of new techniques to improve the yields from available agricultural areas has become essential to meet food requirements owing to the rapidly increasing world population. Therefore, new strategies have been determined to increase product quality in industries that serve agricultural areas.In this study, we attempted to minimise unwanted reactions involved in the manufacturing process of chemical fertilisers.

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Some Studies on Ferroelectricity in KNO₃and Related Compounds

Cited by 45 publications

References 28 publications

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃

Investigations of Ferroelectric Polarization Switching in Potassium Nitrate Composite Films

Caking And Degradation Problem on Nitrogenous Fertiliser and Alternative Solution Processes

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Some Studies on Ferroelectricity in KNO3and Related Compounds

Cited by 45 publications

References 28 publications

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO3

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO3

Investigations of Ferroelectric Polarization Switching in Potassium Nitrate Composite Films

Caking And Degradation Problem on Nitrogenous Fertiliser and Alternative Solution Processes

Contact Info

Product

Resources

About

Some Studies on Ferroelectricity in KNO₃and Related Compounds

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃

Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO₃