Incommensurate crystal structure of PbHfO3
| Autor: | Alexei Bosak, Volodymyr Svitlyk, Alla Arakcheeva, Vadim Diadkin, R. G. Burkovsky, Dmitry Chernyshov, Krystian Roleder |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
Diffraction Phase transition Chemistry Parent structure Metals and Alloys 02 engineering and technology Crystal structure 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Electronic Optical and Magnetic Materials Crystal Crystallography Octahedron Phase (matter) 0103 physical sciences Materials Chemistry Antiferroelectricity 0210 nano-technology |
| Zdroj: | Acta Crystallographica Section B Structural Science, Crystal Engineering and Materials. 76:7-12 |
| ISSN: | 2052-5206 |
| Popis: | Controversy in the description/identification of so-called intermediate phase(s) in PbHfO3, stable in the range ∼420–480 K, has existed for a few decades. A synchrotron diffraction experiment on a partially detwinned crystal allowed the structure to be solved in the superspace groupImma(00γ)s00 (No. 74.2). In contrast to some previously published reports, in the pure compound only one distinct phase was observed betweenPbamPbZrO3-like antiferroelectric andPm3mparaelectric phases. The modulation vector depends only slightly on temperature. The major structure modulation is associated with the displacement of lead ions, which is accompanied by a smaller amplitude modulation for the surrounding O atoms and tilting of HfO6octahedra. Tilting of the octahedra results in a doubling of the unit cell compared with the parent structure. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
| Nepřihlášeným uživatelům se plný text nezobrazuje | K zobrazení výsledku je třeba se přihlásit. |