Meet Inspiring Speakers and Experts at our 3000+ Global Conference Series Events with over 1000+ Conferences, 1000+ Symposiums
and 1000+ Workshops on Medical, Pharma, Engineering, Science, Technology and Business.

Explore and learn more about Conference Series : World's leading Event Organizer

Back

Vijaya Kumar

Vijaya Kumar

University of Mysore, India

Title: Fabrication, optical and thermal properties of glass and crystalline rare-earth aluminates

Biography

Biography: Vijaya Kumar

Abstract

Recently, research on bulk glass and glass-ceramics has attracted the attention due to their low cost optical materials of the future. Alumina based ceramics have wide significant applications because of their refractory nature, high hardness, high strength, transparency in the infra-red region and resistant to chemical attack. Conventionally, rare earth perovskites were prepared by melting process or by sintering techniques because of their refractory nature and recently prepared through several low temperature solution routes. Conventionally, it is difficult to vitrify them without using the network forming agents. In this study, Aero-Dynamic Levitator (ADL) was used to undercool the melt well below the melting temperature. The formation of bulk spherical glass and crystalline RAlO3 (R=rare-earths) phases has been investigated due to their unique features in terms of the solidification process, glass structure and optical properties. RAlO3 sample was levitated by an ADL and completely melted by a CO2 laser and then cooled by turning off the CO2 laser and solidified. Among the rare earth aluminum perovskites, La, Nd and Sm aluminum perovskites solidified as glass and Eu to Lu aluminum perovskites solidified as crystalline phases. The NdAlO3 glass phase showed a high refractive index of ~1.89, suggesting that container less levitation is an elegant technique for fabrication of new glass and crystalline ceramics from an  undercooled melt.

Recent Publications

Vijaya Kumar MS,  Kuribayashi K, Yu J, Okada JT, Ishikawa T (2013)  Microstructure and magnetic properties of metastable RFeO3 (R:  Rare‐earth element) formed from undercooled melt, J. Am. Ceram.  Soc. 96: 995‐1002.

Vijaya Kumar MS,  Okada JT, Ishikawa T, Paradis PF, Watanabe Y  (2014) Density measurement of glass and liquid CaAl 2O4 using a  pressurized electro‐static levitator. Meas. Sci. Tech. 25:085301‐6.

Girish  HN,  Vijaya  Kumar  MS,  Byrappa  K,  Basavalingu  B  (2015)  Hydrothermal  synthesis  of  some  of  the  lanthanide  aluminium  perovskites – LnAlO3 (Ln=La, Sm & Gd), Mat. Res. Innov. 19: 270‐74

Sakata K, Watanabe Y, Okada JT, Vijaya Kumar MS, Paradis PF,  Ishikawa T (2015), FT‐IR emissivity measurements of Nb melt using  an electrostatic levitation furnace, J. Chem. Thermody. 91:116‐120

SanSoucie MP, Rogers JR, Vijaya Kumar MS, Rodriguez J, Xiao X,  Matson DM (2016) Effects of environmental oxygen content and  dissolved oxygen on the surface tension and viscosity of liquid  nickel, Int. J. Thermophys. 37:76 1‐11