𝔖 Bobbio Scriptorium
✦   LIBER   ✦

Preparation and Crystal Structure of a New Reduced Calcium Niobium Oxide: CaNb2O4

✍ Scribed by N. Kumada; N. Kinomiura

Publisher
Elsevier Science
Year
1999
Tongue
English
Weight
289 KB
Volume
147
Category
Article
ISSN
0022-4596

No coin nor oath required. For personal study only.

✦ Synopsis

Single crystals of a new reduced calcium niobium oxide, CaNb 2 O 4 , were prepared in an evacuated quartz tube at 11003C. The calcium niobium oxide crystallizes in the orthorhombic space group Pbcm with a ‫؍‬ 5.054(1), b ‫؍‬ 11.904(1), and c ‫؍‬ 5.839(1) A s , Z ‫؍‬ 4, and the 5nal R factors are R ‫؍‬ 0.027 and R w ‫؍‬ 0.029 for 799 unique re6ections. The crystal structure has the layer built up by edge-sharing of NbO 6 trigonal prisms to form in5nite metal+metal bondings as seen in ANbO 2 (A ‫؍‬ Li,Na). The Ca 2Ψ‰ ion is located at the trigonal prism site in the interlayer. No evidence for superconductivity was found down to 2.0 K.

πŸ“œ SIMILAR VOLUMES

Preparation, Crystal Structure, and Redu
Preparation, Crystal Structure, and Reducibility of K2NiF4Type Oxides Eu2βˆ’xSrxNiO4+Ξ΄
✍ Lou Hui; Chen Ping; Ge Yuping; Lu Yueqing; LΓΌ Guanglie; XΓΌ Yuanzhe; Ma Futai πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 320 KB

K 2 NiF 4 type compounds Eu 2؊x Sr x NiO 4Ψ‰ (0.54x41.2) have been prepared by a citric acid complex decomposition method. Rietveld refinement of the powder X-ray diffraction data showed that there was a crystal system transformation from orthorhombic Fmmm to tetragonal I4/mmm at around x ‫؍‬ 0.6-0.7

Synthesis and Crystal Structure of a New
Synthesis and Crystal Structure of a New Niobium Oxynitride, Nb2N0.88O0.12
✍ Kohta Yamada; Hidetoshi Masuda; Nobuaki Sato; Takeo Fujino πŸ“‚ Article πŸ“… 2000 πŸ› Elsevier Science 🌐 English βš– 198 KB

A new niobium oxynitride Nb 2 N 0.88 O 0.12 has been synthesized by reducing Nb 2 O 5 in a stream of H 2 gas containing 0.07% N 2 at 10803C for 5 weeks. The compound crystallizes in a hexagonal system with space group P3 1m, and Z ‫؍‬ 3. The lattice parameters are a ‫؍‬ 5.2916$0.0001 A s and c ‫؍‬ 4

Single-Crystal Growth and Structure Dete
Single-Crystal Growth and Structure Determination of a New Oxide Apatite, NaLa9(GeO4)6O2
✍ Masaru Takahashi; Kazuyoshi Uematsu; Zuo-Guang Ye; Mineo Sato πŸ“‚ Article πŸ“… 1998 πŸ› Elsevier Science 🌐 English βš– 432 KB

NaLa 9 Ge 6 O 26 , hexagonal, a ‫؍‬ 0.9883(2) nm, c ‫؍‬ 0.7267(3) nm, V ‫01Ψ‹)3(741.6؍‬ 5 nm 3 , space group P6 3 /m, Z ‫؍‬ 1, D calc ‫؍‬ 5.739 g cm ؊3 , (MoK ) ‫؍‬ 0.071069 nm, ‫؍‬ 225.16 cm ؊1 , F(000) ‫؍‬ 924, T ‫؍‬ 298 K, R ‫؍‬ 0.031, R w ‫؍‬ 0.037 for 966 measured unique reflections. Single crys