رسالة جامعية
Planetary Materials Studied by Time-Resolved X-ray Diffraction under Compression in Dynamic Diamond Anvil Cells
| العنوان: | Planetary Materials Studied by Time-Resolved X-ray Diffraction under Compression in Dynamic Diamond Anvil Cells |
|---|---|
| المؤلفون: | Méndez, Alba S. J. |
| المساهمون: | Marquardt, Hauke, Liermann, Hanns-Peter |
| المصدر: | Bayreuth : University of Bayreuth, PhD dissertation 135 pages (2021). doi:10.15495/EPUB_UBT_00005917 = Dissertation, University of Bayreuth, 2021 |
| بيانات النشر: | University of Bayreuth |
| سنة النشر: | 2021 |
| المجموعة: | DESY Publication Database (PUBDB) |
| مصطلحات موضوعية: | planetary materials, water ice, ferropericlase, diamond anvil cells, x-ray diffraction, proton order-disorder transitions, spin transition, bulk modulus Mineral physics, planetary geology, extreme conditions research |
| جغرافية الموضوع: | DE |
| الوقت: | 550 |
| الوصف: | Investigating the physical properties of minerals at extreme pressures and temperatures is crucial for understanding the interior structure of planetary bodies and unravelling their formation and evolution. Earth’s interior is characterized by hosting an iron-rich core enveloped by a mantle with a composition dominated by MgSiO$_3$ and (Mg,Fe)O. One of the aspects that make Earth different from other terrestrial bodies in our Solar System is the presence of liquid H$_2$O. Out of the Solar System, Earth-like exoplanets have caught attention as their composition might be analogous to Earth. Depending on the materials available during their formation, Earth-like exoplanets could have accumulated larger amounts of H$_2$O as compared to Earth (ocean planets). Current models for ocean planets assume an interior structure analogous to Earth, with an additional layer overlying the silicate mantle: an icy mantle of high-pressure ice VII/ice X at the bottom of a liquid ocean. Experimental data on the phase diagram and physical properties of these candidate mantle minerals at high-pressure/-temperature are essential to constrain current planetary interior models. Here, a novel experimental approach was implemented to investigate the compression behavior of planetary materials at extreme conditions. A piezo-driven dynamic Diamond Anvil Cell (dDAC) was employed to generate high pressures. Time-resolved X-ray diffraction was used to characterize the evolution of unit cell volumes (V) with pressure (P). The combination of the dDAC with extremely sensitive X-ray detectors allowed for the collection of diffraction images with high temporal resolution while the sample is being compressed. The uniquely dense sampling of pressure and volume in our data allowed to directly determine changes in the bulk modulus by local differentiation of V(P) without having to rely on an equation-of-state formulation. A resistively-heated dDAC (RHdDAC) was implemented for conducting experiments at simultaneous high-P/T. Using this approach, the ... |
| نوع الوثيقة: | doctoral or postdoctoral thesis |
| اللغة: | English |
| العلاقة: | info:eu-repo/semantics/altIdentifier/urn/urn:nbn:de:bvb:703-epub-5917-6; https://bib-pubdb1.desy.de/record/475107Test; https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2022-01217%22Test |
| الإتاحة: | https://doi.org/10.15495/EPUB_UBT_00005917Test https://bib-pubdb1.desy.de/record/475107Test https://bib-pubdb1.desy.de/search?p=id:%22PUBDB-2022-01217%22Test |
| حقوق: | info:eu-repo/semantics/closedAccess |
| رقم الانضمام: | edsbas.B031A25F |
| قاعدة البيانات: | BASE |
| الوصف غير متاح. |