Ionothermal Synthesis of β-NH4AlF4 and the Determination by Single Crystal X-Ray Diffraction of Its Room Temperature and Low Temperature Phases
| Autor: | Alex M. Z. Slawin, Emily R. Parnham, Russell E. Morris |
|---|---|
| Rok vydání: | 2007 |
| Předmět: |
Diffraction
Phase transition Chemistry Transition temperature Space group General Medicine Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Solvent chemistry.chemical_compound Crystallography Octahedron Group (periodic table) Hexafluorophosphate X-ray crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Single crystal |
| Zdroj: | ChemInform. 38 |
| ISSN: | 1522-2667 0931-7597 |
| DOI: | 10.1002/chin.200720016 |
| Popis: | β-NH4AlF4 has been synthesised ionothermally using 1-ethyl-3-methylimidazolium hexafluorophosphate as solvent and template provider. β-NH4AlF4 crystals were produced which were suitable for single crystal X-ray diffraction analysis. A phase transition occurs between room temperature (298 K) and low temperature (93 K) data collections. At 298 K the space group=I4/mcm (no. 140), α=11.642(5), c=12.661(5) A, Z=2 (10NH4AlF4), wR(F2)=0.1278, R(F)=0.0453. At 93 K the space group=P42/ncm (no. 138), α=11.616(3), c=12.677(3) A, Z=2 (10NH4AlF4), wR(F2)=0.1387, R(F)=0.0443. The single crystal X-ray diffraction study of β-NH4AlF4 shows the presence of two different polymorphs at low and room temperature, indicative of a phase transition. The [AlF4/2F2]− layers are undisturbed except for a small tilting of the AlF6 octahedra in the c-axis direction. |
| Databáze: | OpenAIRE |
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