Evangelia K. Tripoliti

Evangelia K. Tripoliti

Profile
Profile Display Name:

Evangelia K. Tripoliti

E-mail Address:

e.tripoliti.17@ucl.ac.uk

Start Year

2019 (Cohort 6)

Research interests:

Mineral Physics
X-ray Crystallography
High Temperature/ Pressure experiments

Hobbies and interests:

PhD Project
PhD Title

High Pressure and Temperature Crystallography of Mantle Silicates

Research Theme

Solid Earth Dynamics

Primary Supervisor
Primary Institution

UCL

Secondary Supervisor
Secondary Institution

UCL

Additional supervisor(s)

Paul Schofield (NHM),

Abstract

I’m studying the thermoelastic & thermodynamic properties of mantle silicates, at realistic upper mantle (up to 660 km) temperature and pressure conditions by combining high-temperature X-ray diffraction with high-pressure experiments in the multi-anvil. The main goal is to determine the crystallography of deep mantle silicate phases that have never been studied before and to create new equations of state. To do this I’ll synthesize and characterise materials across garnet’s pyrope-majorite, Mg4Si4O12-Mg3Al2Si3O12, and olivine’s forsterite-fayalite, (Mg,Fe)2SiO4, solid solutions, and across majorite’s (Mg,Fe)SiO3 join. I’m particularly interested in the cubic to tetragonal phase transition that occurs within garnet’s (Mg,Fe)SiO3-(Mg,Fe)3Al2Si3O12 join and the thermoelastic properties of the pure MgSiO3 endmember. I’m measuring the thermal expansion of my samples between 30 and 1500 K using powder and neutron X-ray diffraction. Additionally, single-crystal X-ray diffraction at the Natural History Museum and high-pressure experiments at international synchrotron radiation facilities are conducted to determine the full elastic constant matrix of my synthetic samples. Natural specimens provided by the Natural History Museum’s collection are also examined. Finally, all output data will be compared to the literature and, where possible, to results from ab initio quantum mechanical calculations using the package VASP.

Policy Impact
Background Reading
Publications

None

Activities
Conferences and Workshops
  • NHM Student conference 2021 (June 2021). Poster: The Thermal Expansion of (Mg,Fe)2SiO4 Olivines Across the Solid-Solution Range Using X-Ray Powder DIffraction.
  • AGU Conference 2021 (December 2021). Talk: Thermal expansion and magnetostriction in fayalite, Fe2SiO4.
  • International Mineralogical Association (July 2022). Talk: Thermal expansion and magnetostriction in fayalite, Fe2SiO4.
  • International School of Crystallography (June 2022).
  • .
Training courses
  • IUCr/DGK High Pressure Summer School 2020 – Introduction to Novel Methods of Atomic and Electronic Structure Studies at High Pressures, hosted by Bayreuth University, Germany. August 2020
  • Diamond Light Source SR School 2021, hosted by Diamond Events. October 2021
Engagement
  • Demonstrating 1st year modules: MATLAB, the earth, earth materials

Social Links

Stay informed

Click here to subscribe to our RSS newsletter by email.


Find Us

University College London is the administrative lead.

North-West Wing, UCL, Gower Street, London, WC1E 6BT

Follow us on Twitter