To obtain europium(III) chromate, an equimolar solution of europium(III) acetate and chromium(IV) oxide is dried in a vacuum at 70 °C and then heated to 400 °C in air.[2][5] Another way to obtain europium(III) chromate is by reacting stoichiometric amounts of europium(III) nitrate hexahydrate and chromium(III) nitrate nonahydrate for 30 minutes at 433 K (160 °C; 320 °F), 30 minutes at 473 K (200 °C; 392 °F) and then 1 hour at 853 K (580 °C; 1,076 °F). A constant stream of oxygen is passed over the reaction mixture. An oxygen flow is used to stabilise the +5 oxidation state of chromium.[4]
Europium(III) chromate crystallizes tetragonally with space groupI41/amd (No. 141) with lattice parameters a = 722.134(1) and c = 632.896(1) pm with four formula units per unit cell.[2]
The Néel temperature of europium(III) chromate is 15.9 K (−257.2 °C; −431.0 °F).[4] Above 700 °C, europium(III) chromate begins to decompose into europium chromite (EuCrO3).[3]
^G. Buisson, E. F. Bertaut, J. Mareschal (1964), "Etude cristallographique des composes TCrO4 (T = terre rare ou Y)", Comptes rendus hebdomadaires des séances de l'Académie des Sciences (in German), vol. 259, pp. 411–413((citation)): CS1 maint: multiple names: authors list (link)