Sietsema, Pepijn (2023) Synthesis, Structure, and Magnetic Properties of Copper Oxy-Selenites. Bachelor's Thesis, Chemistry.
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Abstract
The goal of this research was to synthesize and analyze the magnetic properties of the triclinic polymorph of the copper oxy-selenite Cu4O(SeO3)3. To obtain these results hydrothermal and chemical vapor transport syntheses were performed with differing molar ratios of Cu(OH)2/CuO and SeO2. Triclinic Cu4O(SeO3)3 is of interest because of its close relation to the cubic phase of Cu2OSeO3, the first and so far only electric insulator able to host magnetic skyrmions. Its magnetic properties have not yet been reported. Various known copper selenites and copper oxy-selenites were successfully synthesized. Crystalline triclinic Cu4O(SeO3)3 was found in the hydrothermal synthesis with a starting molar ratio of 4:3 [Cu(OH)2 : SeO2]. Both the temperature and applied field dependency of the magnetic moment of this compound were investigated for the first time and compared to literature on the skyrmion hosting cubic Cu2OSeO3, and the monoclinic Cu4O(SeO3)3. Long range antiferromagnetic ordering, with a small ferromagnetic moment, was found with a Néel temperature around T=63K and a ferro- or ferrimagnetic phase above T=48K. Although similar magnetic behavior to Cu2OSeO3 was found, the data showed no signs of a transition into a skyrmion phase. At lower temperatures an additional transition was observed around T=16K similar to a transition found in monoclinic Cu4O(SeO3)3.
| Item Type: | Thesis (Bachelor's Thesis) |
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| Supervisor name: | Blake, G.R. |
| Degree programme: | Chemistry |
| Thesis type: | Bachelor's Thesis |
| Language: | English |
| Date Deposited: | 05 Jun 2023 11:48 |
| Last Modified: | 05 Jun 2023 11:48 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/29826 |
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