Table 1: Optical absorption peaks observed in nanopowders, prepared by decomposition of dried sol-gel-derived oxalate at 600°C for 2 h each in air for nickel content ( ) = 0, 0.01, 0.05, and 0.10.

No.x Peak 1Peak 2Peak 3
E (eV)Abs.E (eV)Abs.E (eV)Abs.

1* 06.13+0.974.20#0.203.270.24
2 0.016.130.984.270.273.350.30
3 0.056.201.154.330.363.220.33
4 0.106.101.094.260.453.090.37

*[5].
+ 1 1 .
# 1 1 .
† 1 1 .