Tailoring effect of large polaron hopping in the conduction mechanism of Ca-modified BaTiO3 system
| Autor: | Ashutosh Mishra, Mehjabeen Khan, Supriya Bisen |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Materials science Condensed matter physics Band gap Doping Crystal structure Dielectric Condensed Matter Physics Polaron 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Ion Tetragonal crystal system Electrical resistivity and conductivity 0103 physical sciences Electrical and Electronic Engineering |
| Zdroj: | Journal of Materials Science: Materials in Electronics. 31:9212-9223 |
| ISSN: | 1573-482X 0957-4522 |
| DOI: | 10.1007/s10854-020-03452-1 |
| Popis: | Tailoring effects of Ca-doping concentration on the structural, optical, and electrical properties of Ba1−xCaxTiO3 (x = 0.0 to 0.15) nanomaterials prepared via low-temperature sol–gel auto combustion technique are presented. XRD results reveal that all the prepared nanomaterials are crystallized in tetragonal structure with space group P4mm. FT-IR measurements are carried out in order to reveal the vibrational frequencies of bonds in the crystal lattice. A strong absorption peak due to Ti–O bond (TiO6 octahedron) appears at 538 cm−1 that shifts to a higher frequency with an increase in the doping of Ca ions. It is explained by the Coulomb interaction. Optical band gap of the sample increases with increase Ca doping as 3.44 eV (x = 0.0), 3.48 eV (x = 0.10), and 3.45 eV (x = 0.15). The BCT materials with x = 0.10 apparently show that the particle with short-range order can strongly influence the formation of intermediate states in the gap. Dielectric behavior is found governed by the interfacial polarization, whereas the ac conductivity supports the non-Debye process [n |
| Databáze: | OpenAIRE |
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