Emergence of Dielectric Properties by Doping of Semi‐Transition Metal in Semiconductor Complex Perovskite Oxide. Issue 4 (9th February 2023)

• Record Type: Journal Article
• Authors: Rai, Vishnu Shankar; Prajapati, Dinesh; Verma, Manish Kumar; Kumar, Vinod; Kumar, Atendra; Das, Tapas; Sahoo, Kedar; Singh, Narsingh Bahadur; Mandal, Kamdeo
• Is Part Of: Crystal research and technology. Volume 58:Issue 4(2023)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2023-02-09
• Subjects: cyclic voltammetry -- dielectric properties -- microstructural properties -- optical properties -- semi‐wet route; Crystallography -- Periodicals; 548
• DOI: 10.1002/crat.202200236
• Languages: English
• ISSNs: 0232-1300

Abstract

Abstract: The effect of zinc substitution at the Cu 2+ site and germanium substitution at the Ti 4+ site in bismuth copper titanate, Bi2/3 Cu3 Ti4 O12, is investigated. Composition with x = 0.05 is synthesized by semi‐wet route in the system Bi2/3 Cu3 Ti4− x Ge x O12 (BCTGO) and Bi2/3 Cu3− x Zn x Ti4− x Ge x O12 (BCZTGO) that are sintered at 1123 K for 8 h. Crystal structure has remained cubic. The phase formations of these ceramics are confirmed by the X‐ray diffraction. The microstructural analysis of the samples is done by scanning electron microscopy and tunneling electron microscopy. Elemental analysis is performed by energy dispersive X‐ray spectroscopy. X‐ray photoelectron spectroscopy suggests that all elements present in these ceramics are in proper oxidation states. The dielectric constant is found high for BCTGO‐0.05 ceramic. The specific capacitances of BCTGO‐0.05 and BCZTGO‐0.05 are found to be 13.05 and 15.7 F g −1, respectively. Optical band gap values ( E g ) of BCTGO‐0.05 and BCZTGO‐0.05 ceramics are found as 1.77 and 1.91 eV. Abstract : Bi2/3 Cu3 Ti4− x Ge x O12 and Bi2/3 Cu3− x Zn x Ti4− x Ge x O12 (where x = 0.05) ceramics are successfully synthesized by semi‐wet route and are sintered at 1123 K for 8 h. The dielectric constant for BCTGO‐0.05 ceramic is found as 563 at 100 Hz and 423 K. For the BCZTGO‐0.05 ceramic, the tangent loss at 303 K temperature and 10 kHz frequency is 0.18.