New Ternary Compounds Sc3B0.75C3, Sc2B1.1C3.2, ScB15C1.60 and Subsolidus Phase Relations in the Sc–B–C System at 1700°C

✍ Scribed by Y. Shi; A. Leithe-Jasper; T. Tanaka

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 311 KB
• Volume: 148
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8446

✦ Synopsis

were synthesized for the 5rst time. The 5rst three could be indexed, i.e., Sc 3 BC 3 shows tetragonal symmetry with a ‫؍‬ 3.3308(3) A s and c ‫؍‬ 7.680(2) A s ; the basic hexagonal unit cell of Sc 2 B 1.1 C 3.2 is a ‫؍‬ 3.3991(2) A s , c ‫؍‬ 6.7140(6) A s , with a two-dimensional incommensurate structure with magnitude "q i " ‫؍‬ (2/7 ؉ 0.005) "q 100 " As ؊1 along 1 11002 2 directions; and ScB 15 C 1.60 shows a body centered orthorhombic lattice a ‫؍‬ 10.027(1) A s , b ‫؍‬ 8.0138(9) A s and c ‫؍‬ 5.6668(6) A s . A crystal of Sc 2 BC 2 was grown by the 6oating zone method and the crystal structure was re5ned from single crystal data, which crystallizes with tetragonal symmetry: I4/mmm, a ‫؍‬ 3.3259(2) A s , c ‫؍‬ 10.6741(8) A s , Z ‫؍‬ 2, R ‫؍‬ 0.011 for 263 unique re6ections and 10 variables.