Effect of temperature on band gap of PbWO4 single crystals grown by Czochralski method

The structural and optical properties of PbWO4 single crystals grown by Czochralski method and investigated by x-ray diffraction (XRD) and transmission experiments. XRD pattern presented well-defined and intensive peaks related with tetragonal scheelite structure. Transmission experiments were accomplished for the first time at various temperatures between 10 and 300 K on PbWO4 single crystals to reveal variation of band gap with temperature. Derivative spectroscopy method presented the experimentally observed band gap energy as increasing from 3.20 to 3.35 eV when the temperature was decreased to 10 K from room temperature. The revealed energy was associated with transition taking place between delocalized and trap levels. Temperature-band gap energy plot was analyzed by Varshni and Bose–Einstein models. The fitting processes under the light of these models revealed optical characteristics of absolute zero experimentally observed band gap, variation rate of gap energy with temperature and Debye temperature of PbWO4 single crystal.

[1]  H. Hafez,et al.  Novel Down-converting single-phased white light Pr3+ doped BaWO4 Nanophosphors material for DSSC applications , 2021, Optical Materials.

[2]  F. Almajhdi,et al.  Integrating plasmonic effect and nano-heterojunction formation for boosted light harvesting and photocatalytic performance using CaWO4/Ag2MoO4 and its antibacterial applications , 2021 .

[3]  L. P. Purohit,et al.  Interface analysis of SrWO4:Er3+-Yb3+/Si thin films prepared by radio frequency magnetron sputtering for upconversion emission , 2021 .

[4]  M. Isik,et al.  Defect characterization in Bi12GeO20 single crystals by thermoluminescence , 2021 .

[5]  M. Salavati‐Niasari,et al.  Enhanced visible-light-driven photocatalytic performance for degradation of organic contaminants using PbWO4 nanostructure fabricated by a new, simple and green sonochemical approach , 2020, Ultrasonics sonochemistry.

[6]  A. Yamaguchi,et al.  Temperature dependence on bandgap of semiconductor photocatalysts. , 2020, The Journal of chemical physics.

[7]  N. R. Singh,et al.  Influence of Sm3+ concentration on structural and spectroscopic properties of orange-red emitting PbWO4 phosphor: An energy transfer study , 2020 .

[8]  A. Yamaguchi,et al.  Visible-light-driven dry reforming of methane using a semiconductor-supported catalyst. , 2020, Chemical communications.

[9]  A. Yamaguchi,et al.  Photocatalytic uphill conversion of natural gas beyond the limitation of thermal reaction systems , 2020, Nature Catalysis.

[10]  Y. Javed,et al.  Lamellar shape lead tungstate (PbWO4) nanostructures as synergistic catalyst for peroxidase mimetic activity , 2020, Materials Research Express.

[11]  A. Zanatta.  Revisiting the optical bandgap of semiconductors and the proposal of a unified methodology to its determination , 2019, Scientific Reports.

[12]  Yang Hou,et al.  Nanostructured Ternary Metal Tungstate-Based Photocatalysts for Environmental Purification and Solar Water Splitting: A Review , 2018, Nano-micro letters.

[13]  B. Joseph,et al.  Synthesis of nano Lead Tungstate (PbWO4) by Single Step Modified Combustion Process and Characterization for their application as LTCC and Optical Material , 2018, IOP Conference Series: Materials Science and Engineering.

[14]  Jin Zhang,et al.  Convenient synthesis of twin-Christmas tree-like PbWO4 microcrystals and their photocatalytic properties , 2017, Frontiers of Materials Science.

[15]  H. Yoshida,et al.  Semiconductor Photocatalysts for Non-oxidative Coupling, Dry Reforming and Steam Reforming of Methane , 2014, Catalysis Surveys from Asia.

[16]  D. Errandonea,et al.  A combined high-pressure experimental and theoretical study of the electronic band-structure of scheelite-type AWO4 (A = Ca, Sr, Ba, Pb) compounds , 2011, 1107.3014.

[17]  H. Yoshida,et al.  Photocatalytic Steam Reforming of Methane over Sodium Tantalate , 2010 .

[18]  F. Manjón,et al.  Pressure effects on the structural and electronic properties of ABX4 scintillating crystals , 2008, 0802.0160.

[19]  Gu Mu,et al.  Theoretical study on defects associated with oxygen vacancy in PbWO4 crystal , 2005 .

[20]  K. Nagaraja,et al.  Electrical and humidity sensing properties of lead(II) tungstate–tungsten(VI) oxide and zinc(II) tungstate–tungsten(VI) oxide composites , 2004 .

[21]  E. Longo,et al.  Preparation, structural and optical characterization of BaWO4 and PbWO4 thin films prepared by a chemical route , 2003 .

[22]  Martin Nikl,et al.  Electron traps related to oxygen vacancies in PbWO4 , 2003 .

[23]  M. Itoh,et al.  Optical properties of scheelite and raspite PbWO 4 crystals , 2000 .

[24]  O. Bordun,et al.  Fundamental Absorption Edge of Thin PbWO4 Films , 2000 .

[25]  Roger G. Williams,et al.  Electronic band structures of the scheelite materials --- CaMoO_4, CaWO_4, PbMoO_4, and PbWO_4. , 1998 .

[26]  Giorgio Spinolo,et al.  Radiation induced formation of color centers in PbWO4 single crystals , 1997 .

[27]  K. O'Donnell,et al.  Temperature dependence of semiconductor band gaps , 1991 .

[28]  R. B. Lauer,et al.  Transport processes of photoinduced carriers in Bi12SiO20 , 1973 .