Pseudophase behavior in the epsilon and iota regions of the praseodymium oxide-oxygen system
| Autor: | L. Eyring, M.S. Jenkins, Rhéal P. Turcotte |
|---|---|
| Rok vydání: | 1973 |
| Předmět: |
Diffraction
Materials science Praseodymium Oxide Thermodynamics Mineralogy chemistry.chemical_element Condensed Matter Physics Electronic Optical and Magnetic Materials Inorganic Chemistry Hysteresis chemistry.chemical_compound chemistry X-ray crystallography Materials Chemistry Ceramics and Composites Physical and Theoretical Chemistry Stoichiometry Phase diagram Line (formation) |
| Zdroj: | Journal of Solid State Chemistry. 7:454-460 |
| ISSN: | 0022-4596 |
| DOI: | 10.1016/0022-4596(73)90174-6 |
| Popis: | Besides line and nonstoichiometric phases complex oxide systems exhibit reproducible bivariant behavior, termed pseudophases, in the two-phase regions. This occurrence exaggerates chemical hysteresis. Two of these pseudophases in the praseodymium oxide-oxygen system are examined in some detail by tensimetric and high temperature X-ray studies. The tensimetric measurements show marked and progressive shifting of the curves away from stoichiometry with increasing pressure. In addition, unusual reversals are seen to occur both in oxidation and reduction. X-ray diffraction patterns at temperature are seen to show systematic changes in line positions and line widths. These are analyzed and their implications discussed in terms of suggested structural changes. Similarities and relevance to other systems are suggested. |
| Databáze: | OpenAIRE |
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