Hydrothermal synthesis of single crystal CoAs2O4 and NiAs2O4 compounds and their magnetic properties

Tamara Đorđević; Astrid Wittwer; Zvonko Jagličić; Igor Djerdj

doi:10.1039/C4RA16122J

Hydrothermal synthesis of single crystal CoAs₂O₄ and NiAs₂O₄ compounds and their magnetic properties†

Tamara Đorđević,*^a Astrid Wittwer,^a Zvonko Jagličić^bc and Igor Djerdj^d

* Corresponding authors

^a Institut für Mineralogie und Kristallographie, Universität Wien, Althanstraße 14, A-1090 Wien, Austria
E-mail: tamara.djordjevic@univie.ac.at

^b Institute of Mathematics, Physics and Mechanics, Jadranska 19, Ljubljana, Slovenia

^c Faculty of Civil and Geodetic Engineering, University of Ljubljana, Jamova 2, 1000 Ljubljana, Slovenia

^d Ruđer Bošković Institute, Bijenička 54, 10000 Zagreb, Croatia

Abstract

The crystal structures of the hydrothermally synthesised trippkeite-related materials, CoAs₂O₄ and NiAs₂O₄ were investigated by means of single-crystal X-ray diffraction, Raman and infrared spectroscopy. The obtained compounds crystallise in the tetragonal crystal system (P4₂/mbc), with unit cell parameters at 293 K of a = 8.34530(10)/8.2277(12) Å, c = 5.62010(10)/5.6120(11) Å, V = 391.406(12)/379.90(13) Å³, Z = 4, for CoAs₂O₄ and NiAs₂O₄ respectively. Magnetic measurements show that the resulting single crystal of NiAs₂O₄ exhibits an antiferromagnetic transition at T_N = 53 K in a high magnetic field of 10 kOe, as already reported in the literature. The single crystal of CoAs₂O₄ reveals an interplay between ferromagnetic and a canted antiferromagnetic interactions resulting in a canted antiferromagnetic state which occurs at 105 K – the highest critical temperature among all similar structures.

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Article information

DOI: https://doi.org/10.1039/C4RA16122J
Article type: Paper
Submitted: 10 Dec 2014
Accepted: 05 Feb 2015
First published: 05 Feb 2015
This article is Open Access

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RSC Adv., 2015,5, 18280-18287

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Hydrothermal synthesis of single crystal CoAs₂O₄ and NiAs₂O₄ compounds and their magnetic properties

T. Đorđević, A. Wittwer, Z. Jagličić and I. Djerdj, RSC Adv., 2015, 5, 18280 DOI: 10.1039/C4RA16122J

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