Hm. Ismail et Gam. Hussein, TEXTURE PROPERTIES OF YTTRIUM OXIDES GENERATED FROM DIFFERENT INORGANIC PRECURSORS, Powder technology, 87(1), 1996, pp. 87-92
The texture properties of four samples of Y2O3 (cubic structure) gener
ated from different inorganic precursors (hydrated Yttrium acetate, Y(
CH3COO)(3) . 4H(2)O; nitrate, Y(NO3)(3) . 5H(2)O and oxalate, Y-2(C2O4
)(3) . 8H(2)O) at different temperatures have been studied using BET,
pore size distribution, cumulative surface area, X-ray diffraction (XR
D) and scanning electron microscopy (SEM). The results indicated that
samples obtained from both acetate at 700 degrees C (55 m(2)/gm) and n
itrate at 500 degrees C (58 m(2)/gm) are very similar in surface area
and pore structure (a wider spectrum of mesoporosity); i.e., good prec
ursors for catalyst and catalyst support. The third sample obtained fr
om oxalate at 700 degrees C exhibits a lower surface area ( 12 m(2)/gm
) and different in pore structure; i.e., a good precursor for ceramics
and superconductor manufacture. For Y2O3 generated from nitrate, the
increase in calcination temperature from 500 to 700 degrees C caused a
decrease in the surface area from 58 to 20 m(2)/g, and in the micropo
rosity development. The SEM and particle size calculations have been u
sed to assess the surface properties of Y2O3 samples.