Ternary Phosphide Ho2Cu6−xP5−y, Its Crystal Structure, and REm+n(Cu2P3)m(Cu4P2)n Relationship with Other Rhombohedral Rare-Earth Copper Phosphides
✍ Scribed by Yurij Mozharivskyj; Yurij B. Kuz'ma
- Publisher
- Elsevier Science
- Year
- 2000
- Tongue
- English
- Weight
- 349 KB
- Volume
- 151
- Category
- Article
- ISSN
- 0022-4596
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✦ Synopsis
Crystals of the phosphide Ho 2 Cu 6؊x P 5؊y (x ؍ 0.41, y ؍ 0.50) have been prepared by annealing pressed powders of the elements at 8003C for 2 weeks. The structure was determined by singlecrystal methods: space group R3 m (No. 166), Z ؍ 3, a ؍ 3.976(1) A > , c ؍ 40.554(8) A > , R ؍ 0.045 for 243 independent re-6ections [F> 4 (F)]. The unit cell of Ho 2 Cu 6؊x P 5؊y can be built from a close packing of Ho atoms and fragments of Cu 3 P, with one of the fragments containing additional P atoms. It can be also considered as an intercalation of additional P atoms in the YbCu 3؊x P 2 structure (P. KluK fers, A. Mewis, and H. U. Schuster, Z. Kristallogr. 149, 211 (1979)). The RE m؉n (Cu 2 P 3 ) m (Cu 4 P 2 ) n relationship with other rare-earth copper phosphides, having similar structural characteristics is discussed.