Title of article :
Zone center phonon frequencies in tetragonal zirconia: lattice dynamical study and new assignment proposition
Author/Authors :
Gupta، H.C. نويسنده , , Bouvier، P. نويسنده , , Lucazeau، G. نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2001
Pages :
-872
From page :
873
To page :
0
Abstract :
Two synthesis routes, sol precipitation and sol gelation, using aluminum isopropoxide and lithium nitrate as precursors have been used to prepare lithium aluminate. The sol precipitation method (LISOL) produced a mixture of (gamma)-LiAlO2 and LiAl5O8, and sol gelation (LIGEL) produced pure (gamma)-LiAlO2, both at 750°C. The density and specific surface area of the ceramic powders calcined at 1150°C were 2.72gcm-3 and 6m2g-1, respectively, for the powders obtained by sol precipitation and 2.47gcm-3 and 2m2g-1, respectively, for the powders obtained by sol gelation. The synthesized powders presented thermal stability over 600°C and the sintering process occurred in the temperature range of 600-1400°C. The absorbed heat by the material in this temperature range during DTA/TG experiment showed that the sintering process was more efficient when the powders were previously calcined over 550°C.
Keywords :
C. Raman spectrometry , D. phonons
Journal title :
Journal of Physics and Chemistry of Solids
Serial Year :
2001
Journal title :
Journal of Physics and Chemistry of Solids
Record number :
40338
Link To Document :
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