Spectroscopic ellipsometry study of Bi12TiO20 single crystals

Date

2021-02-01

Author

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

Metadata

Show full item record

This work is licensed under a Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Item Usage Stats

252
views

0
downloads

Bi12XO20 (X: Si, Ge, Ti, etc.) ternary compounds have attracted attention especially due to their fascinating photorefractive characteristics. The present paper introduces the structural and optical characteristics of Bi12TiO20 single crystals grown by Czochralski method. X-ray diffraction pattern of the compound exhibited sharp and intensive peaks corresponding to parallel planes of cubic crystalline structure. The lattice constant of the cubic structure was determined as a = 1.0118 nm using a diffraction pattern indexing program. The optical characterization of the Bi12TiO20 single crystals was carried through spectroscopic ellipsometry experiments performed in the 1.2-5.0 eV spectral range. The spectral dependencies of refractive index, extinction coefficient, and complex dielectric function were revealed analyzing experimental ellipsometric data under the light of sample-air optical model. The band gap energy of the compound was determined as 3.34 eV from the analyses of absorption coefficient. Three critical points at 3.51, 4.10, and 4.71 eV were obtained from the analyses of components of dielectric function using their second-energy derivative spectra.

URI

https://hdl.handle.net/11511/89302

Journal

JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS

DOI

https://doi.org/10.1007/s10854-021-05411-w

Collections

Department of Physics, Article

Suggestions

OpenMETU
Core

Temperature-tuned bandgap characteristics of Bi12TiO20 sillenite single crystals Isik, M.; Delice, S.; Hasanlı, Nızamı; Darvishov, N. H.; Bagiev, V. E. (Springer Science and Business Media LLC, 2020-11-01) Bi12MO20 (M: Si, Ge, Ti, etc.) compounds are known as sillenites having fascinating photorefractive characteristics. The present paper reports the structural and optical characteristics of one of the members of this family, Bi12TiO20 single crystals, grown by Czochralski method. X-ray diffraction pattern of the crystal presented sharp and intensive peaks associated with planes of cubic crystalline structure with lattice constant of a = 1.0142 nm. The optical properties were studied by means of room temperat...
Effective connectivity modeling of human brain Ulusoy, İlkay (null; 2017-11-25) Three different connectivity models, namely structural (anatomical links), functional (statistical dependencies), and effective (causal interactions) have been introduced to examine the interactions between different regions of the brain. To understand the interactive systems, it is of fundamental importance to distinguish the sender from the receiver, and hence to be able to estimate the direction of the information flow. Effective connectivity methods estimate direct and/or indi...
Obese carboxypeptidase E knockout mice exhibit multiple defects in peptide hormone processing contributing to low bone mineral density Cawley, Niamh X.; Yanık, Tülin; Woronowicz, Alicja; Chang, Weizhong; Marini, Joan C.; Loh, Y. Peng (2010-08-01) Cawley NX, Yanik T, Woronowicz A, Chang W, Marini JC, Loh YP. Obese carboxypeptidase E knockout mice exhibit multiple defects in peptide hormone processing contributing to low bone mineral density. Am J Physiol Endocrinol Metab 299: E189-E197, 2010. First published May 11, 2010; doi:10.1152/ajpendo.00516.2009.-Carboxypeptidase E (CPE) is a prohormone/proneuropeptide processing enzyme, and mice bearing CPE mutations exhibit an obese and diabetic phenotype. Studies on CPE knockout (KO) mice revealed poor proh...
An investigation of bacterial and fungal xylanolytic systems Yaşınok, Ayşegül Ersayın; Bakır, Ufuk; Department of Biotechnology (2006) Endo-b-1,4 xylanases (EC. 3.2.1.8) are typically produced as a mixture of different hydrolytic enzymes such as b-1,4-xylosidase (EC. 3.2.1.37) , a-Larabinofuranosidases (EC. 3.2.1.55), and feruloyl esterase (EC 3.1.1.73) that hydrolyze xylan molecule, which constitutes 20-30% of the weight of wood and agricultural wastes. Thus, xylan, a renewable biomass, can be utilized as a substrate for the preparation of many products such as fuels, solvents and pharmaceuticals. Besides, xylanolytic enzymes themselves a...
Genetic diversity of marginal populations of Populus euphratica Oliv. from highly fragmented river ecosystems Kansu, Çiğdem; Kaya, Zeki (2020-01-01) Populus euphratica Oliv. (Euphrates poplar) is one of the naturally distributed poplar species and limited to south and southwestern Turkey. The species possesses great importance for both renewable energy resources and persistence of a healthy river ecosystem. Due to increased habitat destructions and fragmentation by human activities, the distribution area of this species has become narrower. Hence, searching for potential genetic diversity present in species' genetic resources is of great importance in t...

Citation Formats

M. Isik, N. Hasanlı, N. H. Darvishov, and V. E. Bagiev, “Spectroscopic ellipsometry study of Bi12TiO20 single crystals,” JOURNAL OF MATERIALS SCIENCE-MATERIALS IN ELECTRONICS, pp. 0–0, 2021, Accessed: 00, 2021. [Online]. Available: https://hdl.handle.net/11511/89302.