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We report on the synthesis and physical properties of the new ternaryintermetallic Ce$_2$Rh$_2$Ga. Its formation and dimorphism have beeninvestigated by powder and single crystal X-ray diffractometry, as well as bydifferential thermal analyses. LT- and HT-Ce$_2$Rh$_2$Ga can be obtained by thechosen respective thermal treatment. The high-temperature form(HT-Ce$_2$Rh$_2$Ga), stable above 864(5){\deg}C, is orthorhombic La2Ni3-type[Cmce, oS20, a=5.851(2) {\AA}, b=9.618 (2) {\AA}, c=7.487 (2) {\AA}, V=421.3(2){\AA}3]; the low-temperature form (LT-Ce$_2$Rh$_2$Ga), stable below thistemperature, is monoclinic Pr2Co2Al- (Ca2Ir2Si-) type [C2/c, mS20, a=10.0903(6)A, b=5.6041(3) A, c=7.8153(4) A, beta=104.995(3) degrees, V=426.88(4) A3]. Themagnetic measurements were conducted on two different samples, namely on theLT-Ce$_2$Rh$_2$Ga and the other on the HT-Ce$_2$Rh$_2$Ga sample. TheHT-Ce$_2$Rh$_2$Ga compound is found to exhibit a phase transition at 128.5 K.By virtue of the sharp peak anomaly in the temperature dependence of themagnetic susceptibility this phase transition is plausibly of antiferromagneticorigin, but occurs at a remarkably high temperature compared to what is typicalfor Ce binary and ternary compounds. LT- Ce$_2$Rh$_2$Gaa has a ground state offerromagnetic nature which sets in at a paramagnetic-to-ferromagnetic phasetransition at 5.2 K.

Two polymorphs of a new intermetallic Ce$_2$Rh$_2$Ga -- crystal structure and physical properties