An investigation of microporous cetineite-type phases A6[B12O18][CX3]2[Dx(H2O,OH,O)6−y] I. The cetineite structure field
✍ Scribed by X. Wang; F. Liebau
- Publisher
- Elsevier Science
- Year
- 1998
- Tongue
- English
- Weight
- 561 KB
- Volume
- 35
- Category
- Article
- ISSN
- 0992-4361
No coin nor oath required. For personal study only.
✦ Synopsis
Hydrothermal syntheses between 120 and 200 °C have been performed to determine the chemical variability of semiconducting microporous materials with cetineite structure. The Syntheses wore based on the general formula A6[BI2OIs][CX3]2[Dx(H20,OH,O)6-y], (0<_x_<2; 0~y~-6), which was derived from X-ray crystal structure refinements. A = Li +, 1~*, K*, Rb +, Cs +, Tl +, NH4 +, Ca 2+, Sr 2+, and Ba 2+ were introduced as hydroxi~ ia some cases as carbonates, B = C = As 3÷, Sb 3+, and Bi 3+, and X = S 2-, Se 2, ~md Te 2" as elements. Only syntheses with B = C = Sb 3+ and X = S 2" and Se 2" Were s~.
Known cetineite-type phases now include the element eornbinatkms A/Sb3÷/S ~" with A = Na* and K +, and A/Sb3+/Se 2 with A = Na ÷, K ÷, Rb +, Sr 2+, Ba 2+, a~ probably TI +. Variable amounts of Na +, Sb 3+ and C 4÷ were found tO occupy position of the cetineite-type structure. The chemical variability Can be ~ by the coupled substitutions A + + H20 o A 2+ + OH', mH20 ~ D m+ + mO~, and nOIT o D n+ + nO 2". The crystals obtained are orange to dark red, in agreement with their semicondueting properties.