Investigating the magnetic properties and the phase transition between hydrous and anhydrous phases of anilinium cobalt chloride

Igoshin, Aleksandr (2024) Investigating the magnetic properties and the phase transition between hydrous and anhydrous phases of anilinium cobalt chloride. Bachelor's Thesis, Chemistry.

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Abstract

Anilinium cobalt chloride(ACC) is a hybrid perovskite where octahedra of bivalent cobalt hexachloride form linear chains separated by monovalent anilinium cations between the chains. The target compound was synthesized from the anilinium chloride and cobalt (II) chloride hexahydrate precursors by slow crystallization by evaporation from hexan-1-ol or propan-1-ol solvents. Depending on choice of solvents and conditions pink, blue or turquoise phases were synthesized. The product was characterized by X-ray powder diffraction and Physical Properties Measurement System(PPMS). The pink phase was identified as the hydrated form of the target compound whilst the blue and turquoise phases were shown to have similar crystal structure parameters with different effective magnetic moments and Weiss temperatures as per Vibrating Sample Magnetometer(VSM) data. Said data is analyzed by fitting it to the Curie-Weiss law which yielded Curie constants and Weiss temperatures reflective of the magnetic interactions in the material. Taking into account that the cobalt dication Co2+ is a d7 transition metal that can exist in a low or a high spin state(S=3/2 and S=1/2), the effective moments from Curie constants and d7 spin states were compared highlighting difference in magnetic configuration of the phases.

Item Type:	Thesis (Bachelor's Thesis)
Supervisor name:	Blake, G.R.
Degree programme:	Chemistry
Thesis type:	Bachelor's Thesis
Language:	English
Date Deposited:	05 Apr 2024 12:08
Last Modified:	05 Apr 2024 12:08
URI:	https://fse.studenttheses.ub.rug.nl/id/eprint/32201

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