Thulium(III) oxide is a pale green solid compound, with the formula
Tm2 O3. It was first isolated in 1879, from an impure sample of
erbia, by
Swedish chemist
A chemist (from Greek ''chēm(ía)'' alchemy; replacing ''chymist'' from Medieval Latin ''alchemist'') is a scientist trained in the study of chemistry. Chemists study the composition of matter and its properties. Chemists carefully describe th ...
Per Teodor Cleve, who named it ''thulia''.
It can be prepared in the laboratory by burning
thulium
Thulium is a chemical element with the symbol Tm and atomic number 69. It is the thirteenth and third-last element in the lanthanide series. Like the other lanthanides, the most common oxidation state is +3, seen in its oxide, halides and other c ...
metal in air, or by decomposition of their oxoacid salts, such as thulium nitrate.
References
{{Oxides
Thulium compounds
Sesquioxides