Structure and microwave dielectric properties of low-temperature sinterable A2.5VMoO8 (A = Mg, Zn) molybdovanadate ceramics

• Published in: Applied physics. A, Materials science & processing Materials science & processing, 2020, Vol.126 (1), Article 53
• Main Authors: Naveenraj, R., Arun, N. S., Ratheesh, R.
• Format: Article
• Language: English
• Subjects: Applied physics; Ceramic powders; Ceramics; Characterization and Evaluation of Materials; Condensed Matter Physics; Dielectric properties; Laser sintering; Low temperature; Machines; Magnesium; Manufacturing; Materials science; Nanotechnology; Optical and Electronic Materials; Permittivity; Physics; Physics and Astronomy; Processes; Q factors; Raman spectroscopy; Resonant frequencies; Surfaces and Interfaces; Tetrahedra; Thin Films; Unit cell; X ray powder diffraction; Zinc
• ISSN: 0947-8396; 1432-0630
• DOI: 10.1007/s00339-019-3232-2

A 2.5 VMoO 8 (A = Mg, Zn) molybdovanadate ceramics have been prepared through conventional solid-state ceramic route. Phase purity of these ceramics was confirmed using powder X-ray diffraction studies. Co-existence of both MoO 4 2− and VO 4 3− tetrahedra in the unit cell of these molybdovanadates has been identified through laser Raman spectroscopy. Sintered A 2.5 VMoO 8 (A = Mg, Zn) ceramics show homogenous and dense microstructure. Mg 2.5 VMoO 8 ceramic has a dielectric constant ( ε r ) of 8.8, unloaded quality factor of 4800 at 10.85 GHz and temperature coefficient of resonant frequency ( τ f ) of -58 ppm/ ℃ whereas Zn 2.5 VMoO 8 ceramic exhibits a dielectric constant of 11.5, unloaded quality factor of 2500 at 9.18 GHz and temperature coefficient of resonant frequency τ f of 115 ppm/ ℃.