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Semináře

Jan Prokleška: Magnetism, magnetic phase transitions and magnetic phase diagrams
Begin: 22.05.2019, 14:10
Location: lecture room F2, first floor Ke Karlovu 5

 
Title: Itzhak Halevy: Pressure-Induced Crystal-Structure Transition in Fe-Cr Alloys
Number: 35/19
Status: Closing date exceeded
Begin: Středa, 24.04. 2019, 14:10
Tutor: Vladimír Sechovský
Location: lecture room F2, first floor Ke Karlovu 5


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We have a pleasure to invite you to attend the joint seminar
of the Department of Condensed Matter Physics (DCMP)
and the Materials Growth and Measurement Laboratory (MGML) http://mgml.eu.

 

Program

 

Pressure-Induced Crystal-Structure Transition in Fe-Cr Alloys

lecture given by:

Itzhak Halevy

 

Departmentof Physics, NRCN, Beer-Sheva, Israel

Nuclear Engineering Department, Ben Gurion University-Negev, Beer-Sheva, Israel

The seminar takes place in the lecture room F2 
of the Faculty of Mathematics and Physics, Ke Karlovu 5, Praha 2
on Wednesday, 24. 4. 2019 from 14:10 

Vladimír Sechovský
On behalf of the DCMP and MGML


Abstract 

Elemental Iron undergoes crystal-structure transition from bcc (Im-3m space group) to hcp (P63/mmc space group) structure type under the pressure of 13 GPa. With increasing Cr-concentration, the structure transition is shifted to higher pressures (e.g. 18 GPa for Fe70Cr30). For Cr-concentrations higher than 47% we did not see any traces of the phase transition probably because the maximum pressure used (35 GPa) was not high enough to induce the structure transition in the alloys. After releasing the pressure, the cubic symmetry is restored. The Bulk modulus is increasing from 160 GPa (elemental Fe) with increasing Cr concentration up to approx. 30% Cr. Then it starts to decrease again followed by another increase and subsequent decrease represented by a double-peak dependence on Cr concentration. Hydrogen exposure of Fe80Cr20, resulting in negligible H absorption to the surface layers, does not bring any significant changes to the crystal- structure properties.

Fe Cr semiar FeCr 240419 b

 


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