Détermination structurale de Nd2Ge2O7
| Autor: | M. Goreaud, Francine Queyroux, P. Labbe, Geneviève Vetter |
|---|---|
| Rok vydání: | 1982 |
| Předmět: |
Lanthanide
Chemistry Stacking chemistry.chemical_element Triclinic crystal system Condensed Matter Physics Neodymium Electronic Optical and Magnetic Materials Inorganic Chemistry Crystallography Group (periodic table) Materials Chemistry Ceramics and Composites Tetrahedron Germanate Physical and Theoretical Chemistry Crystal twinning |
| Zdroj: | Journal of Solid State Chemistry. 45:293-302 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/0022-4596(82)90174-8 |
| Popis: | The neodymium germanate Nd 2 Ge 2 O 7 crystallizes in the triclinic P 1 space group with a = 37.6093(99), b = 6.9222(3), c = 6.9234(12), A, α = 91.456(13), β = 90.728(17), γ = 95.150(16)°, and Z = 12. The unit cell is built of 6 isolated GeO 4 tetrahedra, 6 Ge 3 O 10 groups, and 24 NdO 7 or NdO 8 polyhedra. The heavy atoms are distributed in plans parallel to (100) and regularly spaced. The structure can be viewed as the stacking of 6- and 12-A-wide blocks parallel to (100) with the same composition. It can also be described as alternated Nd or Ge atomic slices parallel to ( 31 1 ). Comparisons of these features with the already known lanthanide germanate structures are made, particularly with Gd 2 Ge 2 O 7 . The crystals Nd 2 Ge 2 O 7 are frequently twinned; a structural interpretation of twinning is proposed. |
| Databáze: | OpenAIRE |
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