New high temperature modification of CeTiGe : structural characterization and physical properties

Bernard Chevalier (1) , Wilfried Hermes (2) , Etienne Gaudin (1) , Rainer Pöttgen (2)

1 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
2 Institut für Anorganische und Analytische Chemie

The new high temperature form (HT) of the ternary germanide CeTiGe was prepared by annealing at 1373 K. The investigation of HT-CeTiGe by x-ray powder diffraction shows that the compound crystallizes in the tetragonal CeScSi type structure (space group I4/mmm; a = 414.95(2) and c = 1590.85(10) pm as unit cell parameters). Electrical resistivity, thermoelectric power, magnetization and specific heat measurements performed down to 2 K on HT-CeTiGe reveal a non-magnetic strongly correlated electron system; the specific heat divided by temperature attains a value of 0.635 J mol ^{− 1} K ^{− 2} at 2 K. The comparison of the physical properties of the two crystallographic modifications of CeTiGe suggests a decrease of the hybridization J_cf between 4f(Ce) and conduction electrons in the sequence LT-CeTiGe...

Mots clés: Heat capacity; Thermoelectrics; Magnetisms; Crystal structure; Inorganic compounds

Domaines: Matériaux

Bernard Chevalier, Wilfried Hermes, Etienne Gaudin, Rainer Pöttgen. New high temperature modification of CeTiGe : structural characterization and physical properties. Journal of Physics: Condensed Matter, 2010, 22 (14), 146003 (6p.). ⟨10.1088/0953-8984/22/14/146003⟩. ⟨hal-00467039⟩