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The R2Pd3Ge5 (R = La–Nd, Sm) germanides: synthesis, crystal structure and symmetry reduction
- Publication Year :
- 2016
- Publisher :
- Springer New York LLC, 2016.
-
Abstract
- Direct synthesis and structural characterization of a series of polar rare earth palladium germanides of R2Pd3Ge5 composition (R = La–Nd, Sm) is reported. The crystal structure of the Nd representative was determined by single-crystal X-ray diffraction analysis (U2Co3Si5-type, SG: Ibam, oI40, Z = 4, a = 10.1410(6), b = 12.0542(8), c = 6.1318(4) A, wR 2 = 0.0306, 669 F 2 values, 31 variables). The crystal structures of the other homologues were ensured by powder X-ray diffraction pattern analysis. A smooth variation of the cell dimensions is observed through the rare earth series. The structure of the studied compounds can be interpreted as consisting of a complex three-dimensional [Pd3Ge5]δ− network spaced by the rare earth cations. Within the concept of symmetry reduction, a Barnighausen tree is used to rationalize the related crystal structures of the RPd2Ge2, RPdGe3 and R2Pd3Ge5 ternary compounds, enriching the large family of the BaAl4 derivatives. Moreover, syntheses with metal fluxes were performed, some of which were successful to obtain large crystals of La2Pd3Ge5 (using Bi as solvent) and Nd2Pd3Ge5 (using Pb as solvent) stoichiometry.
- Subjects :
- Diffraction
Flux synthesis
chemistry.chemical_element
02 engineering and technology
Crystal structure
010402 general chemistry
01 natural sciences
Metal
Single-crystal X-ray diffraction
Germanides
Physical and Theoretical Chemistry
Polar intermetallics
Chemistry
Condensed Matter Physics
021001 nanoscience & nanotechnology
0104 chemical sciences
Solvent
Crystallography
visual_art
visual_art.visual_art_medium
Polar
0210 nano-technology
Ternary operation
Stoichiometry
Palladium
Subjects
Details
- Language :
- English
- Database :
- OpenAIRE
- Accession number :
- edsair.doi.dedup.....af5ed307a66021a459bc50dea6157cca