Browsing Fizik Bilim Dalı by Issue Date

Now showing items 1-20 of 23

Temperature-dependent absorption edge and photoconductivity of Tl 2In2S3Se layered single crystals

Güler, İpek; Ambrico, M.; Ligonzo, T.; Gasanly, N.M. (2013-02-15)

Temperature variation of indirect band gap of Tl2In 2S3Se layered single crystals were obtained by means of absorption and photoconductivity measurements. The temperature coefficient of -7.1 × 10-4 eV/K from absorption ...
Parallel data reduction techniques for big datasets

Yıldırım, Ahmet Artu; Özdoğan, Cem; Watson, Dan (2013-10-31)

Data reduction is perhaps the most critical component in retrieving information from big data (i.e., petascale-sized data) in many data-mining processes. The central issue of these data reduction techniques is to save time ...
Optical analysis of TlInS2xSe2(1-x) mixed crystals

Güler, İpek (2014-01-21)

The ellipsometry measurements were carried out on TlInS2xSe2(1-x) mixed crystals in the spectral range of 1.5-6.0 eV at room temperature. The refractive index, extinction coefficient, real and imaginary parts of dielectric ...
Thermoluminescence in gallium sesquisulfide single crystals: usual and unusual heating rate dependencies

Guler, I.; Isik, M.; Gasanova, L.; Mahammadov, A.; Gasanly, N. (2018-07)

Thermoluminescence (TL) experiments were conducted for Ga2S3 crystals to obtain information about trapping parameters. TL measurements were performed from 10 to 300 K with varying heating rates in the range of 0.2–0.8 K/s. ...
Analysis of the specific heat and the free energy of [N(CH3)(4)](2)ZnBr4 close to the ferro-paraelastic phase transition

Kiracı, Ali (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 ...
Raman wavenumbers calculated as a function of pressure from the mode Gruneisen parameter of PZT (x=0.48) ceramic close to the monoclinic-cubic transition

Kiracı, Ali (2019-10)

The isothermal mode Grüneisen parameter γT(P) of some Raman modes in PbZr1-xTixO3 (PZT, x=0.48) were calculated as a function of pressure by means of the observed pressure-dependent volume data of PZT (x=0.48) crystal from ...
Damping constant and the inverse relaxation time calculated as a function of pressure using the X-ray diffraction data close to the cubic-tetragonal phase transition in SrTiO3

Yurtseven, H.; Kiracı, Ali (2019-10-26)

The damping constant is calculated as a function of pressure at room temperature using the normalized intensity as an order parameter near the cubic-tetragonal phase transition in SrTiO3. The observed X-ray diffraction ...
Order-disorder transition in the ferroelectric LiTaO3

Kiracı, Ali; Yurtseven, Hamit (2019-10-26)

The temperature dependences of the damping constant and the relaxation time are calculated by using the Raman frequencies of a* and the lowest A(1) (TO) phonons in the ferroelectric phase close to the ferroelectric-paraelectric ...
Thermoluminescence characterization of (Ga2Se3)(0.25) - (Ga2S3)(0.75) single crystal compounds

Işık, M.; Güler, İpek; Gasanly, N. M. (2020-03-15)

Ga2Se3 and Ga2S3 compounds take attention due to their potential applications in photovoltaics. Defects and impurities may affect the quality of optoelectronic devices. Therefore, it is worthwhile to determine the parameters ...
The Important Role of N(2)(CH3)(4) Ion in the Phase-Transition Mechanism of [N(CH3)(4)](2)ZnBr4

Kiracı, Ali (2020-05)

The chemical shift of the N(2)(CH3)(4) ion, which has been found to exhibit the similar anomalous behavior of the monoclinic angle $\Delta \beta $ , was related to the order parameter to evaluate the temperature dependence ...
Structural and optical properties of thermally annealed thallium indium disulfide thin films

Güler, İpek; Gasanly, N. (2020-06-30)

Structural and optical properties of thallium indium disulfide (TlInS2) thin films, deposited by thermal evaporation technique and thermally annealed at different temperatures, were analyzed. Crystallite size, dislocation ...
Phenomenological Study of Manganese Antimonite Close to the Néel Temperature

Kiracı, Ali (2021)

The anomalous behavior of the frequency $f$ and specific heat ${C_p}$ data for the new layered trigonal ($P\bar{3}1m$) form of manganese antimonite (MnSb2O6) was analyzed by means of the power-law relations with the critical ...
Phenomenological approaches on the Nd3+ doped ferroelectric LaBGeO5

Kara, N.; Kiracı, Ali; Yurtseven, Hamit (2021)

Two phenomenological models, namely the compressible Ising model and Landau model, have been used to analyze the specific heat and the dielectric constant data, respectively for the pure and Nd3+ doped LaBGeO5 (LBG) crystals. ...
A phenomenological study on ferroelectric β-glycine

Kiracı, A (2021)

The anomalous behavior of the specific heat for (Formula presented.) -glycine was analyzed in terms of the compressible Ising model approximately 5 K below and above the ferrelectric-paraelectric phase transition temperature ...
Analysis of the specific heat and the free energy and calculation of the entropy and the internal energy of [N(CH3)(4)](2)MnBr4 close to the phase transition

Kiracı, Ali (2021-10-26)

The critical behavior of the specific heat and the Gibbs free energy of [N(CH3)(4)](2)MnBr4 was analyzed using the 'sing model close to the phase transition temperature of T-c = 276.5 K. Obtained value of alpha=0.02 from ...
A phenomenological study on ferroelastic KH3(SeO3)(2) and KD3(SeO3)(2)

Kiracı, Ali (2021-11)

The anomalous behavior of the Brillouin frequency shift omega of the soft acoustic mode for KH3(SeO3)(2) and KD3(SeO3)(2), and also the volume thermal expansion proportional to(V) and the specific heat C of KH3(SeO3)(2) ...
Investigation of the anomalous behavior of the linewidth (damping constant) for the Raman Ag modes in SrSnO3 ceramic

Kiracı, Ali (2022)

The anomalous behavior of the linewidth (damping constant) for the Raman Ag modes of 223 cm−1 and 260 cm−1 that contribute to the phase transition mechanism of SrSnO3 ceramic close to the phase transition temperatures of ...
Structural and optical properties of (TlInS2)0.75(TlInSe2)0.25 thin films deposited by thermal evaporation

Güler, I.; Işık, M.; Gasanly, N. (2023-01)

Layered semiconductor materials have become a serious research topic in recent years, thanks to their effective optical properties. In this article, the thin-film structure of Tl2In2S3Se [(TlInS2)0.75(TlInSe2)0.25] material ...
Growth and temperature tuned band gap characteristics of NaBi(MoO4)2 single crystal

Isik, M.; Güler, İ.; Gasanly, N.M. (2023-02-01)

Structural and optical properties of double sodium-bismuth molybdate NaBi(MoO4)2 semiconductor compound was investigated by x-ray diffraction, Raman and transmission experiments. From the x-ray diffraction experiments, the ...
Growth and characterization of NaBi(Mo0.5W0.5O4)2 single crystal: A promising material for optoelectronic applications

Işık, M.; Güler, İ.; Gasanly, N.M. (2023-03-15)

The structural and optical characteristics of NaBi(Mo0.5W0.5O4)2 single crystals grown by Czochralski method were investigated. X-ray diffraction (XRD) pattern exhibited four well-defined peaks related to tetragonal ...

Now showing items 1-20 of 23

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