Characterization and densification of defect pyrochlore oxide powders ABi2Ta5O16 (A=Na, Tl). Issue 5 (May 2019)

• Record Type: Journal Article
• Authors: Sidi Ahmed, O. Ait; Bourja, L.; Chagraoui, A.; Tairi, A.; Moussaoui, A.; Oulahyane, H. Ait; Manoun, B.; Villain, S.
• Is Part Of: Heliyon. Volume 5:Issue 5(2019)
• Publication Date: 2019-05
• Subjects: Inorganic chemistry -- Materials chemistry; Research -- Periodicals; Medical sciences -- Periodicals; Natural history -- Periodicals; Social sciences -- Periodicals; Earth sciences -- Periodicals; Physical sciences -- Periodicals; 507.2
• DOI: 10.1016/j.heliyon.2019.e01628
• Languages: English
• ISSNs: 2405-8440

Abstract

Abstract: Defect pyrochlore oxide powders ABi2 Ta5 O16, in the pseudo-binary systems BiTaO4 –ATa3 O8 (A = Na, Tl), were prepared by solid state method. The structural study showed that all oxides crystallize in a cubic system with the space group Fd 3 m, the lattice parameter "a" were determined using Rietveld refinement method. For systematic study on densification from powders, the samples were pressed with a uniaxial pressure into pellets; sintering temperature, holding time and heating rate were optimized. Techniques, including X-ray diffraction, IR-Raman, MEB, dilatometry, were employed to investigate the structure and the morphology of the synthesized powders and sintered materials. The dielectric characteristics, relative permittivity and dielectric losses (tgδ), determined at room temperature are comparable to those of other pyrochlores.