aluminium in solid liquid Br2 was dropped into a solid mixt. of oxide and a large excess ofAl powder in one-end sealed quartz tube under Ar atm., evacuated, seale d, placed in a tabular furnace with temp. gradient from 750 to 460 K;

aluminium in solid Ln2O3, AlBr3 (Ln:Al = 1:4) and Al powder were placed into an one-end sealed quartz tube under Ar, sealed under vac., heated at 600 K for 1 h; sealed tube was placed in a tubular furnace with a reduced temp. gradient from 750 to 460 K, vapor transport reaction for 6 h, tube was quicklyremoved from the furnace, the hot end was quenched with water, AlBr3 wa s condensed;

in hydrogen bromide oxide dissoln. in dil HBr (1:3), soln. evapn. until crystn. occured; crystals sepn. from mother liquor, drying (vac. desiccator, over CaCl2, P2O5 and alkali) to const. mass;

in not given prepared according to Meyer, G. Inorg. Synth. 1989, 25, 146.;

in hydrogen bromide aq. HBr; according to G. Meyer, S. Doetsch, T. Staffel, J. Less-Common Met. 1987,127, 155; Dy2O3 and NH4Br dissolved in aq. HBr (48percent); solvent removed; solvent removed, bromide complex decomposed at elevated temp.; purified by sublimation under vac. (<0.00001 mbar); detd. by powder XRD;