New Compounds In3Ti2AO10, In6Ti6BO22, and Their Solid Solutions (A: Al, Cr, Mn, Fe, or Ga; B: Mg, Mn, Co, Ni, Cu, or Zn): Synthesis and Crystal Structures

✍ Scribed by Francisco Brown; Noboru Kimizuka; Yuichi Michiue; Takahiko Mohri; Masaki Nakamura; Masahiro Orita; Kiyoshi Morita

• Publisher: Elsevier Science
• Year: 1999
• Tongue: English
• Weight: 207 KB
• Volume: 147
• Category: Article
• ISSN: 0022-4596
• DOI: 10.1006/jssc.1999.8358

✦ Synopsis

Zn) were synthesized at and above 10003C in air through solid-state reactions among the constituent cation oxide powders. They are isostructural with the monoclinic and/or orthorhombic In 3 Ti 2 FeO 10 having a pyrochlore-related crystal structure with a commensurate or incommensurate modulated structure. The high-temperature phase is orthorhombic, and the low-temperature phase is monoclinic. The lattice constants of In 3 Ti 2 AO 10 are as follows: In 3 Ti 2 AlO 10 (12003C): a(A s ) ‫؍‬ 5.833(2), b(A s ) ‫؍‬ 3.371(2), and c(A s ) ‫؍‬ 12.060(6); In 3 Ti 2 AlO 10 (11003C): a(A s ) ‫؍‬ 5.8368(7), b(A s ) ‫؍‬ 3.3721(4), c(A s ) ‫؍‬ 6.3402(8), and (3) ‫؍‬ 107.87(1); In 3 Ti 2 CrO 10 (12003C): a(A s ) ‫؍‬ 5.9246(8), b(A s ) ‫؍‬ 3.3562(5), c(A s ) ‫؍‬ 6.3546(9), and (3) ‫؍‬ 108.10(1); In 3 Ti 2 GaO 10 (12003C): a(A s ) ‫؍‬ 5.861(2), b(A s ) ‫؍‬ 3.385(1), and c(A s ) ‫؍‬ 12.094(4); In 3 Ti 2 GaO 10 (10003C): a(A s ) ‫؍‬ 5.8742(9), b(A s ) ‫؍‬ 3.3828(5), c(A s ) ‫؍‬ 6.353(1), and (3) ‫؍‬ 107.87(1). In 3 Ti 2 AlO 10 and In 3 Ti 2 GaO 10 are polymorphic. The lattice constants of In 6 Ti 6 BO 22 are as follows: In 6 Ti 6 MgO 22 (12003C): a(A s ) ‫؍‬ 5.9236(7), b(A s ) ‫؍‬ 3.3862(4), c(A s ) ‫؍‬ 6.3609(7), and (3) ‫؍‬ 108.15(1); In 6 Ti 6 MnO 22 (12003C): a(A s ) ‫؍‬ 5.9361(9), b(A s ) ‫؍‬ 3.4031(5), c(A s ) ‫؍‬ 6.3435(10), and (3) ‫؍‬ 108.26(1); In 6 Ti 6 CoO 22 (12003C): a(A s ) ‫؍‬ 5.9243(5), b(A s ) ‫؍‬ 3.3841(3), c(A s ) ‫؍‬ 6.3495(6), and (3) ‫؍‬ 108.18(1); In 6 Ti 6 NiO 22 (12003C): a(A s ) ‫؍‬ 5.9191(6), b(A s ) ‫؍‬ 3.3729(3), c(A s ) ‫؍‬ 6.3568(6), and (3) ‫؍‬ 108.13(1); In 6 Ti 6 CuO 22 (10003C): a(A s ) ‫؍‬ 5.916(2), b(A s ) ‫؍‬ 3.379(1), and c(A s ) ‫؍‬ 12.029(4); In 6 Ti 6 ZnO 22 (12003C): a(A s ) ‫؍‬ 5.9223(6), b(A s ) ‫؍‬ 3.3830(3), c(A s