Phase equilibria in systems involving the rare earth oxides. Part III. The Eu2O3-In2O3 system

Abstract

The equilibrium phase di agra m was deter mined fo r t he E u20 3-1n 20 3 sys te m . An induct ion furn ace, h aving an iridium cru cible as t he h eat in g cle ment (susceptor) , was used to establish t he solidus and liquidus cur ves. The 1 :1 co mposit io n melts co ngru ently at 1745 10 C. M elt ing poi nt relations suggest t hat t he J :1 co mposition is a co mpou nd wi t h solid solu t ion ext ending both to 31 mole per cent 1n203 a nd 71 mole percent 1n20 3. The compo und is pse udohexago nal wi th au = 3.69 A a nd GEl = J 2.38 A. 1sostru ctura l p h ases a lso occ ur in t he 1:1 mixtures of both Gd20 3 a nd D y 20 3 wit h 1n20 3. T he m elt in g p oints of E U20 3 a nd 1n203 were d etermined to be 2,240 10 C a nd 191O JO C r esp ecti vely. A eutectic occurs in t he E u203-1n203 system at . 1 ,730 C and abo ut 73 mo le p erccn t 1n20 3. The indicated uncer tain t ies i n t he melting poin ts arc co nservative estim ates of t he over all inaccurac ies o f te mperatu r e meas uremcnt. '1 I !