da Costa G.M.; Van San E.; De Grave E.; Vandenberghe R.E.; Barron V.; Datas L.(2002)
A novel method for synthesis of aluminium hematites, based upon the homogeneous precipitation of Fe and Al oxinates in various proportions, is presented. The precursor precipitates are heated in air at 700 °C. X-ray ...
Viana R.R.; da Costa G.M.; De Grave E.; Jordt-Evangelista H.; Stern W.B.(2002)
The Mossbauer spectra of several blue beryls have been obtained in the temperature range of 4.2-500 K. A common feature observed in all room-temperature spectra is the presence of an asymmetric Fe2+ublet (ΔEQ5> ~ 2.7 mm ...