Study of the Diffused Reflectance and Microstructure for the Phase Transformation of KNO_{3}

• Authors: M. Hafez , I. Yahia , S. Taha
• Languages of publication: EN

Abstracts

EN

Optical, micro-structural, thermal and electrical properties of the investigated potassium nitrate (KNO_{3}) samples were characterized by various techniques such as X-ray analysis, scanning electron microscopy, UV-VIS-NIR absorption and differential scanning calorimetry. The presence of structural phase transition is checked by differential 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 KNO_{3} were found to be 0.236 eV for phase II and 0.967 eV for phase I. The optical band gaps of KNO_{3} 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 n-π* transition. Then, the short-wavelength part is probably due to the transition in a higher excited state of symmetry π-π*. 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 modifications at 129°C.

Keywords

EN

61.05.cp; 64.60.-i; 61.43.Gt; 78.20.-e; 72.15.Eb

Discipline

• 61.05.cp: X-ray diffraction
• 61.43.Gt: Powders, porous materials
• 64.60.-i: General studies of phase transitions(see also 63.70.+h Statistical mechanics of lattice vibrations and displacive phase transitions; for critical phenomena in solid surfaces and interfaces, and in magnetism, see 68.35.Rh, and 75.40.-s, respectively)
• 78.20.-e: Optical properties of bulk materials and thin films(for optical properties related to materials treatment, see 81.40.Tv; for optical materials, see 42.70-a; for optical properties of superconductors, see 74.25.Gz; for optical properties of rocks and minerals, see 91.60.Mk; for optical properties of specific thin films, see 78.66.-w)
• 72.15.Eb: Electrical and thermal conduction in crystalline metals and alloys

• Publisher: Institute of Physics, Polish Academy of Sciences
• Journal: Acta Physica Polonica A
• Year: 2015
• Volume: 127
• Issue: 3
• Pages: 734-740

Dates

published

2015-03

received

2013-06-04

(unknown)

2014-12-29

(unknown)

2015-01-28

Contributors

author

M. Hafez

• Physics Department, Faculty of Science, Cairo University, Cairo, Egypt

author

I. Yahia

• Nano-Science and Semiconductor Labs., Physics Department, Faculty of Education, Ain Shams University, Roxy, Cairo, Egypt
• Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia

author

S. Taha

• Department of Physics, Faculty of Science, King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
• Physics Department, Faculty of Science, El-Fayoum University, El-Fayoum, Egypt

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Identifiers

DOI

10.12693/APhysPolA.127.734