Synthesis and magnetic properties of rare earth ruthenates, Ln₅Ru₂O₁₂ (Ln=Pr, Nd, Sm–Tb)

M. Bharathy (1) , W. R. Gemmill (1) , A. H. Fox (1) , Jacques Darriet (2) , Joke Hadermann (3) , M. S. Remy (1) , Hans-Conrad Zur Loye (1)

1 Department of Chemistry and Biochemistry [Columbia, South Carolina]
2 ICMCB - Institut de Chimie de la Matière Condensée de Bordeaux
3 EMAT - Electron Microscopy for Materials Science

Single crystals of Ln₅Ru₂O₁₂ (Ln=Pr, Nd, Sm–Tb) were grown out of either NaOH or KOH fluxes in sealed silver tubes. The crystals of all the phases were observed to be twinned as confirmed by TEM studies. The series crystallize in the C2/m monoclinic system with lattice parameters, a=12.4049(4)–12.7621(6) Å, b=5.8414(2)–5.9488(3) Å, c=7.3489(2)–7.6424(4) Å, β=107.425(3)–107.432(2)° and Z=2. The crystal structure is isotypic with the defect/disorder model of Ln₅Re₂O₁₂ (Ln = Y, Gd) and consists of one dimensional edge shared RuO₆ octahedral chains separated by a two dimensional LnO_x polyhedral framework. Magnetic measurements indicate paramagnetic and antiferromagnetic behavior for Ln=Nd, Sm–Gd and Ln=Tb, respectively.

Mots clés: Ln₅<i>M</i>₂O₁₂; TEM; Hydroxide fluxes; Twinned crystals; Metal–metal bonding

Domaines: Matériaux

M. Bharathy, W. R. Gemmill, A. H. Fox, Jacques Darriet, Joke Hadermann, et al.. Synthesis and magnetic properties of rare earth ruthenates, Ln₅Ru₂O₁₂ (Ln=Pr, Nd, Sm–Tb). Journal of Solid State Chemistry, 2009, 182 (5), pp.1164-1170. ⟨10.1016/j.jssc.2009.02.013⟩. ⟨hal-00385679⟩