High-pressure X-ray investigation of zincite ZnO single crystals using diamond anvils with an improved shape
| Autor: | H. Ahsbahs, Heidrun Sowa |
|---|---|
| Rok vydání: | 2006 |
| Předmět: |
Bulk modulus
Phase transition Axial ratio Zincite Diamond Mineralogy chemistry.chemical_element engineering.material General Biochemistry Genetics and Molecular Biology chemistry Phase (matter) visual_art engineering visual_art.visual_art_medium Composite material Beryllium Wurtzite crystal structure |
| Zdroj: | Journal of Applied Crystallography. 39:169-175 |
| ISSN: | 0021-8898 |
| DOI: | 10.1107/s0021889805042457 |
| Popis: | A high-pressure cell for single-crystal investigations requires large opening angles. If it does not contain any beryllium but only two diamonds mounted on steel backing plates, normally only lower pressures can be attained without risk of disruption of the diamond anvils [Ahsbahs (2004).Z. Kristallogr.219, 305–308]. In order to enable pressures up to at least 10 GPa, specially shaped anvils were designed. In a first study with such anvils, the high-pressure behaviour of zincite ZnO was investigated up to the transition pressure of about 9.5 GPa. A slight decrease of the axial ratioc/awith increasing pressure was observed. The fit of the Birch–Murnaghan equation of state gave a bulk modulusK= 146.5 (8) GPa with a fixed pressure derivativeK′ = 4. During the phase transformation, the single crystals were destroyed. The pronounced preferred orientation of the obtained material, however, enabled the determination of the orientation relations between the low-pressure wurtzite-type and the high-pressure NaCl-type phase. The orientation relations are similar to those in CdS and CdSe. |
| Databáze: | OpenAIRE |
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