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(La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
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Martin Kirchner
Veröffentlicht/Copyright:
25. September 2009
Abstract
The inverse cubic perovskites (La3O)Al, (La3N)Al, (Ce3O)Al, and (Ce3N)Al are reported together with the solid solution series (Ce3C1–xNx)Al. The crystal structure of (La3N)Al is analyzed in detail based on single crystal X-ray diffraction data (space group Pm-3m, a = 509.04(1) pm, Z = 1, Rgt(F) = 0.008, wR(F2) = 0.018). Combined X-ray powder diffraction and thermal analysis studies on samples with various N and O contents indicate only small tolerance of the ternary compounds towards Z = N, O deficiency and small solubility of Z in hexa gonal α-Ce3Al. Indications for the existence of a cubic β-Ce3Al with Cu3Au structure type could not be derived from any experiment. All studied phases are metals, the Ce compounds contain the rare-earth metal in Ce(4f1) states according to X-ray absorption spectroscopy and measurements of the magnetic susceptibilities. The Ce moments order antiferromagnetically with TN decreasing and scaling with increasing unit cell dimension of the compounds. Electronic band structure calculations reveal a trend to increased mixing of Z and La states on going from Z = O via N to C. Formation of a band gap even in the formally electronically balanced (La3C)Al is mainly prohibited by insufficient charge transfer between the metal species.
Keywords: Inverse perovskites; Rare-earth compounds; Electronic properties; Chemical bonding; Powder diffraction structure analysis; X-ray diffraction
:
Published Online: 2009-9-25
Published in Print: 2006-5-1
© by Oldenbourg Wissenschaftsverlag, München
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Artikel in diesem Heft
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- Binary rare earth Laves phases — an overview
- Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
- Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
- Reflections on symmetry and formation of axial quasicrystals
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- Crystal growth and magnetic properties of rare earth borosilicides
- The effect of transition metal doping on thermal conductivity of YB66
- Structure refinements of iron borides Fe2B and FeB
- Cubic structure types of rare-earth intermetallics and related compounds
- Structural variations in Gd5Si4-xSnx: size vs. electronic effects
- Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
- Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
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- (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
- Geometric variations and electron localizations in intermetallics: PbFCl type compounds
- A novel series of sphere packings with arbitrarily low density
- Books Received
Schlagwörter für diesen Artikel
Inverse perovskites;
Rare-earth compounds;
Electronic properties;
Chemical bonding;
Powder diffraction structure analysis;
X-ray diffraction
Artikel in diesem Heft
- Editorial: Crystal Chemistry of Intermetallic Compounds
- Fritz H. Laves – 100 years young
- Fritz H. Laves – an ideal for generations
- Gustav E. R. Schulze's pioneering work on Laves phases
- Preparation, phase stability and structure of the C36 Laves phase Nb1–xCo2+x
- Atom order and thermodynamic properties of the ternary Laves phase Ti(TiyNixAl1–x–y)2
- Atomic ordering in the Laves phases L1 V(Co1–xSix)2 (x = 0.43 and 0.56)
- Microscopic structures of Laves phases and structurally related compounds: a transmission electron microscopy study
- Binary rare earth Laves phases — an overview
- Binary intermetallic phases formed by Ca, Sr, Ba, Eu and Yb: similarities and differences
- Complexity of hexagonal approximants in the RE13Zn~58 system (RE = Ce, Pr, Nd, Sm, Gd, Tb and Dy)
- Reflections on symmetry and formation of axial quasicrystals
- Mosaic-like tilings derivated from o-Co4Al13 and m-Co4Al13 crystal structures
- High-pressure crystal chemistry of binary intermetallic compounds
- Re3B type intermetallics — crystal chemistry, bonding and properties
- Ti2Rh6B – a new boride with a double perovskite-like structure containing octahedral Rh6 clusters
- On the formation and crystal structure of the Pd6B phase
- Crystal growth and magnetic properties of rare earth borosilicides
- The effect of transition metal doping on thermal conductivity of YB66
- Structure refinements of iron borides Fe2B and FeB
- Cubic structure types of rare-earth intermetallics and related compounds
- Structural variations in Gd5Si4-xSnx: size vs. electronic effects
- Tin flux synthesis of rare-earth metal silicide compounds RESi1.7 (RE = Dy, Ho): a novel ordered structure derived from the AlB2 type
- Filling the CoSn host-cell: the HfFe6Ge6-type and the related structures
- Synthesis and characterization of Na2Ba4Ga2Sb6 and Li13Ba8GaSb12
- Ge40.0Te5.3I8: synthesis, crystal structure, and properties of a new clathrate-I compound
- Ag6GeS4X2 (X: Cl, Br): surprisingly no filled Laves phases but the first representatives of a new structure type
- Low- and high-temperature structures of YbCuBi
- (La3Zx)Al and (Ce3Zx)Al with Z = C, N, O: preparation, physical properties and chemical bonding of metal-rich perovskites
- Geometric variations and electron localizations in intermetallics: PbFCl type compounds
- A novel series of sphere packings with arbitrarily low density
- Books Received
