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Translucent yttrium aluminum garnet: Microwave-assisted route to synthesis and processing

Published online by Cambridge University Press:  31 January 2011

M. Panneerselvam
Affiliation:
Solid State and Structural Chemistry Unit and Materials Research Center, Indian Institute of Science, Bangalore-560012, India
G. N. Subanna
Affiliation:
Solid State and Structural Chemistry Unit and Materials Research Center, Indian Institute of Science, Bangalore-560012, India
K. J. Rao*
Affiliation:
Solid State and Structural Chemistry Unit and Materials Research Center, Indian Institute of Science, Bangalore-560012, India
*
c)Address all correspondence to this author.
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Abstract

A novel and fast microwave route is described for the synthesis of yttrium aluminum garnet (YAG) and for its sintering to translucent bodies. Precursor was made by microwave decomposition (20 min) of aluminum tri-sec-butoxide and yttrium nitrate dissolved in ethyl acetate. The precursor, conventionally calcined at 1000 °C (1 h), was sintered in microwave using SiC as secondary heater for just 35 min. Resulting translucent YAG has a microhardness (HV) of 18.1 GPa and fracture toughness (KIC) of 4.3 MPa m1/2. A 0.86-mm-thick sintered pellet exhibits approximately 45% transmission for 520-nm radiation. The entire microwave process requires less than 3 h.

Type
Rapid Communications
Copyright
Copyright © Materials Research Society 2001

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