Microwave gel combustion synthesis and sinterability of Nd:GGG nanopowders

作者：Laishram Kiranmala^*; Mann Rekha; Malhan Neelam

来源：Journal of Rare Earths, 2014, 32(6): 521-525.

DOI：10.1016/S1002-0721(14)60102-2

• Nd:GGG
• microwave gel combustion
• calcinations
• densification
• rare earths

Neodymium doped gadolinium gallium oxide (Nd:GGG) nanopowders synthesized by microwave gel combustion using alanine as a fuel was reported. Metal nitrates solution with alanine fuel was combusted in microwave to give precursor. The microwave precursor powder was calcined at different temperatures from 800 to 1100 degrees C. Phase pure Nd:GGG formation took place at 800 to 1100 degrees C as observed by X-ray diffraction (XRD) and Fourier transform infra-red (FTIR) spectroscopy. However particle size increased with calcinations temperature from 25 nm at 800 degrees C to 200 nm at 1100 degrees C. Nd:GGG nanopowder obtained at different calcination temperatures were compacted and sintered at 1550 degrees C for 3 h in air. Most densified ceramic was obtained from Nd:GGG nanopowder calcined at 1100 degrees C. Microstructure as observed from scanning electron microscopy (SEM) showed that the most densified ceramic, obtained from nanopowder calcined at a higher calcination temperature, had a more uniform grain-size distribution, fewer pores and greater densification. XRD of sintered sample showed retention of phase purity.

• 出版日期2014-6