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Browsing by Author "Çankaya Üniversitesi, Ortak Dersler Bölümü, Temel Mühendislik Ana Bilim Dalı, Fizik Bilim Dalı"

Now showing items 1-14 of 14

A phenomenological study on ferroelectric pyridinium tetrafluoroborate (C5NH6) BF4

Kiracı, Ali (Elsevier, 2019-10)

The temperature dependence of the specific heat C-V of (C5NH6)BF4 was analyzed according to a power law formula with a critical exponent alpha deduced from the compressible Ising model in the vicinity of the phase transition ...
A Thermodynamic Study On Pbzr0.52Ti0.48O3 Ceramic Close to the Tetragonal-Cubic Transition

Kiracı, Ali (Springer, 2020-05-01)

The isobaric Grüneisen parameter and the wavenumber (frequency) of various Raman modes in PbZr1-xTixO3 (PZT x = 0.48) ceramic were calculated by means of the unit cell volume of this crystal. In addition, the damping ...
Analysis of the Specific Heat and the Free Energy of [N(Ch 3 ) 4 ] 2 Znbr 4 Close to the Ferro-Paraelastic Phase Transition

Kiracı, Ali (Taylor&Francis LTD, 2019-02-04)

A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat C p and the Gibbs free energy G of [N(CH 3 ) 4 ] 2 ZnBr 4 compound in the vicinity of the phase transition ...
Analysis of the specific heat and the free energy of [N(CH3)(4)](2)ZnBr4 close to the ferro-paraelastic phase transition

Kiracı, Ali (Taylor&Francis LTD, 2019-03-04)

A power-law formula deduced from the Ising model was used to analyze the temperature dependence of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)ZnBr4 compound in the vicinity of the phase transition temperature ...
Calculation of the frequency shifts and damping constant for the Raman modes (A(1g), B-1) near the tetragonal-cubic transition in SrTiO3

Kiracı, Ali; Yurtseven, Hasan Hamit (Scientific Technical Research Council Turkey-Tubitak, 2017-01)

Raman shifts of the soft mode A(1g) and the B-1 mode are calculated at various pressures at room temperature for the cubic-tetragonal transition (P-c = 9.5 GPa) in SrTiO3. This calculation is performed using the observed ...
Calculation of the infrared frequencies as a function oftemperature using the volume data in the ferroelectric phase ofnano2

Yurtseven, H.; Kiracı, Ali (Taylor&Francis INC, 2014-02-17)

We calculate the temperature dependence of the infrared frequencies of the TO and LO modes with the symmetries of A(1), B-1 and B-2 mainly in the ferroelectric phase of NaNO2. This calculation is carried out using the ...
Damping Constant (Linewidth) and the Relaxation Time of the Brillouin LA Mode for the Ferroelectric-Paraelectric Transition in PbZr1-xTixO3

Yurtseven, Hamit; Kiracı, Ali (IEEE-INST Electrical Electronics Engineers INC, 2016-10)

The damping constant (linewidth) of the longitudinal acoustic (LA) mode is calculated as a function of temperature using the observed Brillouin frequencies of this mode from the literature for the ferroelectric-paraelectric ...
Damping constant and the relaxation time calculated for the lowest-frequency soft mode in the ferroelectric phase of Cd2Nb2O7

Kiracı, Ali; Yurtseven, H. (Elsevier GMBH, 2016)

The temperature dependence of the phonon frequency omega(ph) and of the damping constant Gamma(sp) due to pseudospin-phonon coupling of the lowest-frequency soft mode is calculated in the ferroelectric phase near the ...
Impaired redox homeostasis in the heart left ventricles of aged rats experiencing fast-developing severe hypobaric hypoxia

Ağaşcıoğlu, Eda; Çolak, Rıdvan; Demirel, Haydar; Çakatay, Ufuk (Springer, 2019-10)

Despite its rare occurrence, humans and animals have been prone to getting fast developing severe hypobaric hypoxia. Understanding the redox homeostasis related response of an aging heart to this type of hypoxia are crucially ...
Optical and structural characterization of silicon nitride thin films deposited by PECVD

Güler, İpek (Elsevier, 2019-07)

Plasma enhanced chemical vapor deposition (PECVD) technique was used to deposit silicon nitride (SiNx) thin films. The silane (SiH4) and ammonia (NH3) were used as reactant gases. Both the flow rates of the NH3 and SiH4 ...
Ring annulation versus alkylation of pyrrole with alpha-phosphoryl-alpha,beta-unsaturated ketones

Taşgın, Dilek Işık; Unaleroğlu, Canan (Pergamon-Elsevier Science LTD, 2016-09-29)

In this study; novel aryl, heteroaryl, pyrrolyl and phosphoryl groups containing pyrrolizines were synthesized by the ring annulation reaction of aryl or heteroaryl substituted alpha-phosphoryl-alpha,beta-unsaturated ketones ...
Structural and Optical Properties of Ga2Se3 Crystals by Spectroscopic Ellipsometry

Güler, İpek; Işık, Mesut; Gasanly, Nizami Mamed; Gasanova, L. G.; Babayeva, Raziye (Springer, 2019-04)

Optical and crystalline structure properties of Ga2Se3 crystals were analyzed utilizing ellipsometry and x-ray diffraction (XRD) experiments, respectively. Components of the complex dielectric function (epsilon=epsilon(1)+i ...
Study of vibrational modes in (Ga2S3)(x) - (Ga2Se3)(1-x) mixed crystals by Raman and infrared reflection measurements

Erdemir, Işık Merda; Güler, İpek; Gasanly, Nizami Mamed (Elsevier, 2019-09)

Raman and infrared (IR) reflection characteristics were investigated in the frequency region of 100-450 cm(-1) for (Ga2S3)(x) - (Ga2Se3)(1-x) mixed crystals for compositions of x increasing from 0.0 to 1.0 by intervals of ...
Temperature and Excitation Intensity Tuned Photoluminescence In Ga0.75In0.25Se Crystals

Işık, M.; Güler, I.; Gasanlyc, N. M. (Elsevier Science BV, 2013-01)

Photoluminescence (PL) spectra of Ga0.75In0.25Se layered single crystals have been studied in the wavelength range of 580-670 nm and temperature range of 7-59 K. Two PL emission bands centered at 613 nm (2.02 eV, A-band) ...

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Browsing by Author "Çankaya Üniversitesi, Ortak Dersler Bölümü, Temel Mühendislik Ana Bilim Dalı, Fizik Bilim Dalı"

Browsing by Author "Çankaya Üniversitesi, Ortak Dersler Bölümü, Temel Mühendislik Ana Bilim Dalı, Fizik Bilim Dalı"

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