Multi-temperature X-ray diffraction study of a reversible structural phase transition in the high-temperature polymorph of Ce2Rh2Ga compound

Europium-rich ternary phases with noble metals Eu2M2X (M = Pd, Pt; X = Al, Ga, Ge, Cd), and their structural relationship to the Laves phase Ca2Pt3Al1–xAgx

“…12 Recently, some ternary phases with the formulation R2M2X with divalent 'active' metals (R = Ca, Sr and Eu) and noble metals of the platinum group (M = Pd, Ir, and Pt), started attracting attention as they frequently exhibited polymorphism with often reversible structural phase transition as a function of temperature, external pressure, valence electron count, and even the active metal size. [13][14][15][16][17][18][19][20][21][22][23] The noble metals therein are present in form of linear chains that are either pair-wise distorted or equidistant. They crystallize mainly in three structure types, and their structural selection seems to be governed by three competing factors.…”

“…These included dimorphic Ce2Rh2Ga which exhibits a reversible phase transition from a LT-modification crystallizing with the Ca2Ir2Si type (space group, C2/c) and a HT-modification, corresponding to a ternary ordered variant of the La2Ni3-type, also known for Ce2Ru2Al (space group, Cmce). 23 Again, such polymorphism could be of interest for realization of interesting physical properties, such as the magnetocaloric effect (MCE).…”

Heavy-Fermion Properties of Yb2Pd2SnH≈2

“…The R 2 T 2 X (R = rare-earth, T = transition metal, X = p-metal) series represents an extended group of materials, recently attracting lot of attention [1][2][3][4][5][6][7][8]. Although several different crystal structures have been identified for the given stoichiometry [9], most research effort has been focused on the family of tetragonal compounds with the Mo 2 FeB 2 structure (ordered ternary derivative of the U 3 Si 2 type).…”