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Rapid synthesis of Nd:YAG nanopowder by microwave flash combustion

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Choudhary R. , Laishram K. , Gupta R. K.

Materials Science Poland

2009

tom Vol. 27, No. 4/1

1025--1031

Nd:YAG nanopowders were successfully synthesized by a novel approach using rapid microwave drying of sol. Citrate nitrate sol was treated in a microwave oven for a few minutes. The as-prepared precursor was calcined at 900 °C for 2 h. Characterization was done by thermogravimetric analysis, Fourier transform infrared spectroscopy, X-Ray diffraction (XRD) and transmission electron microscopy (TEM). XRD showed the formation of phase pure polycrystalline YAG. The particle size was found to be 24 nm (estimated from Scherrer´s equation). TEM indicated that the particle size was in the 24-70 nm range. Nd3+ doping was confirmed by SEM-EDX. Nd:YAG nanopowder synthesized by this method was of low agglomeration and the particles were spherical in shape.

Microwave-flash combustion synthesis of yttria nanopowders

100%

Mangalaraja R. V. , Ramam K. V. S. , Ravi J. , Camurri C. P.

Materials Science Poland

2007

tom Vol. 25, No. 4

1075--1080

Single phase yttria nanopowders for transparent ceramics were successfully prepared by using a novel approach called microwave-flash combustion technique. This technique involves the reaction of yttrium nitrate and urea in microwave oven for few minutes. The as-prepared precursor powder was later calcined at 1100 st.C for 4h to form cubic crystalline yttria nanopowders. The as-prepared and calcined powders were analysed by such methods as thermogravimetry, Brunauer-Emmett-Teller surface area measurement, X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results confirmed that the yttria powder synthesized by microwave-flash combustion was homogeneous and the particles size was in the range of 50-120 nm for calcined powders.