Structural and temperature-tuned optical characteristics of Bi12GeO20 sillenite crystals

Basit Öğe Kaydı
dc.authoridGasanly, Nizami / 0000-0002-3199-6686
dc.authoridDelice, Serdar / 0000-0001-5409-6528
dc.authorwosidGasanly, Nizami / ABA-2249-2020
dc.authorwosidDelice, Serdar / AAU-4793-2020
dc.contributor.authorDelice, S.
dc.contributor.authorIsik, M.
dc.contributor.authorGasanly, N. M.
dc.contributor.authorDarvishov, N. H.
dc.contributor.authorBagiev, V. E.
dc.date.accessioned2021-11-01T15:05:14Z
dc.date.available2021-11-01T15:05:14Z
dc.date.issued2020
dc.department[Belirlenecek]
dc.description.abstractSillenite compounds exhibit unique photorefractive and electro-optic characteristics providing attractiveness to these materials in various optoelectronic applications. The present paper aims at investigating one of the members of this family. Structural and optical characteristics of Bi12GeO20 (BGO) were studied by means of x-ray diffraction, Raman spectroscopy and temperature-dependent transmittance measurements. Obtained transmission curves in the wavelength range of 350-1100 nm and at different applied temperatures between 10 and 300 K were employed to find out the absorption coefficient dependence on the photon energy. Tauc relation revealed the presence of an energy gap of 2.49 eV at room temperature. Extension of energy gap up to 2.57 eV due to decreased temperature down to 10 K was deduced by the analysis. In order to have reliable results, the energy gap value was corroborated by utilizing derivative spectral method and well consistency between both methods was indicated. Energy gap change with temperature was also discussed in the study using an empirical formula developed by Varshni. Energy gap at absolute zero and rate of band gap alteration with temperature were determined as 2.57 eV and -2.4 x 10(-4) eV K (- 1), respectively. Taking into account the previously reported studies on investigation of band gap characteristics of BGO, intrinsic Bi-Ge(3+) + V-O(+) defect could be responsible for the revealed energy value of 2.49 eV which is much lower than reported band gap energy of similar to 3.2 eV.
dc.description.sponsorshipATILIM UniversityAtilim University [ATU-ADP-1920-03]en_US
dc.description.sponsorshipThis work was supported by ATILIM University under Grant No: ATU-ADP-1920-03.en_US
dc.identifier.doi10.1016/j.cjph.2020.04.005
dc.identifier.endpage429en_US
dc.identifier.issn0577-9073
dc.identifier.scopus2-s2.0-85086868023
dc.identifier.scopusqualityQ1
dc.identifier.startpage422en_US
dc.identifier.urihttps://doi.org/10.1016/j.cjph.2020.04.005
dc.identifier.urihttps://hdl.handle.net/11491/7187
dc.identifier.volume66en_US
dc.identifier.wosWOS:000559138200007
dc.identifier.wosqualityQ2
dc.indekslendigikaynakWeb of Science
dc.indekslendigikaynakScopus
dc.institutionauthor[Belirlenecek]
dc.language.isoen
dc.publisherElsevier
dc.relation.ispartofChinese Journal Of Physics
dc.relation.publicationcategoryMakale - Uluslararası Hakemli Dergi - Kurum Öğretim Elemanı
dc.rightsinfo:eu-repo/semantics/closedAccess
dc.subjectSillenitesen_US
dc.subjectBismuth germanium oxideen_US
dc.subjectOptical propertiesen_US
dc.titleStructural and temperature-tuned optical characteristics of Bi12GeO20 sillenite crystals
dc.typeArticle

Dosyalar

Koleksiyon

WoS İndeksli Yayınlar Koleksiyonu
Scopus İndeksli Yayınlar Koleksiyonu