Vliv Fe substitucí na transformační teploty ve slitinách Ni2MnGa
Influence of Fe substitutions on tranformation temperatures in Ni2MnGa alloys
bachelor thesis (DEFENDED)
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http://hdl.handle.net/20.500.11956/120420Identifiers
Study Information System: 188756
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- Kvalifikační práce [10690]
Author
Advisor
Referee
Prchal, Jiří
Faculty / Institute
Faculty of Mathematics and Physics
Discipline
General Physics
Department
Department of Condensed Matter Physics
Date of defense
3. 9. 2020
Publisher
Univerzita Karlova, Matematicko-fyzikální fakultaLanguage
Czech
Grade
Very good
Keywords (Czech)
Heuslerovy slitiny, magnetická tvarová paměť, martenzitická transformaceKeywords (English)
Heusler alloys, magnetic shape memory, martensitic transformationIn this bachelor thesis we are interested in studying the properties of Ni2MnGa alloy and their development with the other element substitution, for example with iron. Overally, we were studying five samples with four different compositions described by the formula Ni50Mn 25Ga25-xFex where the concentration of iron was in the interval . Consequently we performed on the prepared single crystals an extensive characterization by the methods of x-ray and electron diffraction, differential scanning calorimetry and dilatometry. Special emphasis was devoted to measuring the magnetization with vibrational magnetometer. The obtained data enabled us to confirm the quality of the prepared single crystals and to observe a development of Ni2MnGa properties, especially the temperatures of the phase transformations.