Işık, Mehmet

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Profile URL
https://hdl.handle.net/20.500.14411/8160
Name Variants
Mehmet, Işık
M.,Işık
Isik, Mehmet
Mehmet, Isik
I., Mehmet
I.,Mehmet
Işık,M.
Isik,M.
I.,Mehmet
M.,Isik
Işık, Mehmet
M., Isik
Isik, M.
Job Title
Profesör Doktor
Email Address
mehmet.isik@atilim.edu.tr
Main Affiliation
Department of Electrical & Electronics Engineering
Status
Former Staff
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Scholarly Output

173

Articles

169

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442/794

Supervised MSc Theses

3

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0

WoS Citation Count

1806

Scopus Citation Count

1866

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20

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20

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10.44

Scopus Citations per Publication

10.79

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11

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Optical Materials17
Physica B: Condensed Matter16
Journal of Luminescence15
Materials Science in Semiconductor Processing14
Journal of Materials Science: Materials in Electronics12
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Has files: falseSubject: Double tungstates

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    Article
    Citation - WoS: 7
    Citation - Scopus: 7
    Temperature dependent bandgap in NaBi(WO4)2 single crystals
    (Elsevier Gmbh, 2022) Isik, M.; Gasanly, N. M.; Darvishov, N. H.; Bagiev, V. E.
    The double tungstates have been an attractive research interest due to their optoelectronic applications. In the present work, NaBi(WO4)(2), one of the members of double tungstates family, was grown by Czochralski method as single crystal form and optically investigated. X-ray diffraction pattern presented three peaks associated with tetragonal scheelite crystalline structure. Optical properties of the crystal were studied by performing temperature-dependent transmission measurements between 10 and 300 K. The shift of the absorption edge to higher energies was observed with decrease of temperature. The analyses indicated that direct band gap energy increases from 3.50 to 3.60 eV when the temperature was decreased from room temperature to 10 K. The temperature dependency of bandgap was studied considering the Varshni model and fitting of the experimental data under the light of model presented the optical parameters of band gap energy at 0 K, rate of band gap change with temperature and Debye temperature as E-g(0) = 3.61 eV, gamma = 8.83 x 10(-4) eV/K and beta = 456 K, respectively. Urbach energies were also determined from the analyses as 122 and 113 meV for 10 and 300 K experimental data, respectively.