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Synthesis and characterizations of chromium doped Fe3Se4: Magnetic and electronic transport properties
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Kemian tekniikan korkeakoulu |
Master's thesis
Electronic archive copy is available via Aalto Thesis Database.
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CHEM3025
Language
en
Pages
57
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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.