Fizikalne lastnosti visokoentropijskih zlitin (GaNi)$_\mathrm{x}$CoCrFe (x = 0,4–1,6)

Mihor, Peter (author), Vrtnik, Stanislav (mentor)

V tej zaključni nalogi so predstavljene visokoentropijske zlitine (angl. HEA – High-Entropy Alloys), ki so zlitine vsaj petih različnih elementov periodnega sistema, ki v njih nastopajo v medsebojno primerljivih količinah. V zadnjih dvajsetih letih se jih na področju kovinskih materialov intenzivno raziskuje. Zaradi njihove tehnološke zanimivosti in potencialne uporabe za različne aplikacije jih že vrsto let preučuje tudi skupina za visokoentropijske zlitine z raziskovalnega Odseka za fiziko trdne snovi F5 Instituta "Jožef Stefan", ki preučuje njihove električne in magnetne lastnosti. Večina raziskav poteka na dveh merskih sistemih ameriškega proizvajalca Quantum Design. Physical Property Measurement System 9T (PPMS 9T) omogoča meritve fizikalnih lastnosti trdnih snovi, merski sistem Magnetic Property Measurement System 3 (MPMS 3) pa je namenjen meritvam magnetnih lastnosti trdnih in tekočih snovi. V okviru zaključne naloge sem sodeloval pri raziskovanju serije novosintetiziranih visokoentropijskih spojin s kemijsko formulo (GaNi)xCoCrFe (x = 0,4–1,6), kjer se skupaj spreminja delež galija (Ga) in niklja (Ni). Na podlagi teh raziskav je skupina objavila članek v reviji Materials & Design, na katerega se v nalogi tudi sklicujem. Sodeloval sem pri pripravi vzorcev za meritve, pri merjenju magnetizacije, električne upornosti in magnetnostrikcije (sprememba dolžine in oblike v magnetnem polju), ter pri obdelavi in analizi merskih rezultatov. Ugotovljeno je bilo, da so zlitine feromagnetne narave in da posedujejo funkcionalno kombinacijo magnetne mehkosti in izginjajoče magnetostrikcije, kar jih uvršča med energetsko učinkovite supertihe materiale, primerne za elektromagnetne aplikacije z izmeničnim tokom v audio-frekvenčnem območju.

• Language: Slovenian
• Keywords: visokoentropijske zlitine, magnetostrikcija, feromagnetizem, magnetna mehkost
• Work type: Final paper
• Typology: 2.11 - Undergraduate Thesis
• Organization: FMF - Faculty of Mathematics and Physics
• Year: 2026
• PID: 20.500.12556/RUL-182537
• COBISS.SI-ID: 274866179
• Publication date in RUL: 15.05.2026

Secondary language

• Language: English
• Title: Physical properties of (GaNi)$_\mathrm{x}$CoCrFe (x = 0.4–1.6) high-entropy alloys

Abstract

This graduation thesis presents high-entropy alloys (HEA), which are alloys of at least five different elements of the periodic table, each present in comparable quantities. Over the past twenty years, they have been the subject of intensive research in the field of metallic materials. Due to their technological interest and potential use in various applications, they have also been studied for many years by the High-entropy alloys group at the F5 Solid State Physics Department of the Jožef Stefan Institute, investigating their electrical and magnetic properties. Most of the research is conducted on two measuring systems made by the USA manufacturer Quantum Design. The Physical Property Measurement System 9T (PPMS 9T) enables measurements of the physical properties of solids, while the Magnetic Property Measurement System 3 (MPMS 3) is designed to measure the magnetic properties of solids and liquids. As a part of my thesis, I participated in the research of a series of newly synthesized high-entropy alloys with the chemical formula (GaNi)xCoCrFe (x = 0.4–1.6), where the contents of gallium (Ga) and nickel (Ni) were jointly varied. Based on this research, the group has published a paper in the journal Materials & Design, to which I also refer in my thesis. I participated in the preparation of samples for measurements, in the measurement of magnetization, electrical resistance and magnetostriction (a change in length and shape in a magnetic field), and in the data processing and measurement results analysis. It was found that the alloys are ferromagnetic in nature and possess functional combination of magnetic softness and vanishing magnetostriction, which classifies them as energy-efficient super-silent materials suitable for electromagnetic applications with alternating current in the audio-frequency range.

• Keywords: high-entropy alloys, magnetostriction, ferromagnetism, magnetic softness