Temperature dependent bandgap in NaBi(WO4)2 single crystals

Date

2022-05-01

Author

Isik, M.
Hasanlı, Nızamı
Darvishov, N.H.
Bagiev, V.E.

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© 2022 Elsevier GmbHThe 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 Eg(0) = 3.61 eV, γ = − 8.83 × 10−4 eV/K and β = 456 K, respectively. Urbach energies were also determined from the analyses as 122 and 113 meV for 10 and 300 K experimental data, respectively.

Subject Keywords

Double tungstates, Electronic structure, NaBi(MoO4)2, NaBi(WO4)2, Optical properties

URI

https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85126396777&origin=inward
https://hdl.handle.net/11511/97004

Journal

Optik

DOI

https://doi.org/10.1016/j.ijleo.2022.168811

Collections

Department of Physics, Article

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Citation Formats

M. Isik, N. Hasanlı, N. H. Darvishov, and V. E. Bagiev, “Temperature dependent bandgap in NaBi(WO4)2 single crystals,” Optik, vol. 258, pp. 0–0, 2022, Accessed: 00, 2022. [Online]. Available: https://www.scopus.com/inward/record.uri?partnerID=HzOxMe3b&scp=85126396777&origin=inward.