Synthesis, structural, electrical and magnetic properties of Bi2Fe4-xGaxO9 (0 ≤ x ≤ 1.6). Issue 8 (1st June 2019)

• Record Type: Journal Article
• Authors: Ashtar, M.; Gong, G.S.; Gao, Y.X.; Xu, L.M.; Marwat, M.A.; Wang, Y.Q.; Yuan, S.L.; Tian, Z.M.
• Is Part Of: Ceramics international. Volume 45:Issue 8(2019)
• Page Start: 10236
• Page End: 10242
• Publication Date: 2019-06-01
• Subjects: Frustrated magnet -- Multiferroics -- Antiferromagnetic -- Spin glass; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2019.02.076
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: We investigate the electrical and magnetic properties of the Bi2 Fe4- x Ga x O9 (0 ≤ x ≤ 1.6) polycrystalline samples synthesized via solid-state reaction technique. Magnetic susceptibility measurements reveal that lightly doped samples (x < 0.8) undergo successive transitions, from high-temperature paramagnetic to antiferromagnetic phase followed by a low-temperature spin-glass state while the samples with heavy doping (x > 0.8) demonstrate paramagnetic to spin-glass (SG) transition. The variation of irreversible temperature obtained from zero field cooling (ZFC) and field cooling (FC) susceptibilities versus measured magnetic field and low-temperature magnetic hysteresis (M-H) loops support the existence of spin-glass phase. The dielectric constant ( Ɛ r ) of Bi 2 Fe 4-x Gax O 9 with Ga-dilution reveals a weak-temperature sensitivity in high-temperature range (300 K ≤ T ≤ 550 K), which is advantageous for high temperature capacitor applications and electronic devices.