Synthesis and characterizations of chromium doped Fe3Se4: Magnetic and electronic transport properties
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Journal Title
Journal ISSN
Volume Title
Kemian tekniikan korkeakoulu |
Master's thesis
Authors
Date
2024-01-23
Department
Major/Subject
Functional Materials
Mcode
CHEM3025
Degree programme
Master's Programme in Chemical, Biochemical and Materials Engineering
Language
en
Pages
57
Series
Abstract
This study investigates chromium(Cr)-doped Fe₃Se₄, revealing complex interactions between crystal structure modification and magnetic/electronic behaviors. The solid-state synthesis of Fe₃Se₄ confirms its monoclinic structure (I2/m). Cr doping induces significant shifts in XRD patterns, indicating alterations to the lattice structure and effective Cr integration in the chemical formula (Fe1-xCrx)3Se4. The coexistence of monoclinic phases I2/m and C2/m indicates polymorphism, offering insights into structural changes during Cr doping. Magnetic property analysis shows the ferrimagnetic behavior of undoped Fe₃Se₄ with a Curie temperature of 325 K. Cr doping results in diverse magnetic responses, including reductions of Curie temperature at x = 0.1 and transformations to hard magnetic properties. The x = 0.1 doping level emerges as a promising candidate for tuning magnetic properties. Resistivity analysis explores electronic transport, highlighting temperature-dependent variations in Cr-doped samples compared to the undoped Fe3Se4 sample. The intricate influence of Cr doping on electronic properties, linked to crystal structure anisotropy modifications, is also clarified in this study.Description
Supervisor
Karppinen, MaaritThesis advisor
Tewari, GirishKeywords
Cr doping, Fe3Se4, ferrimagnetic, magnetic properties, transport properties, resistivity