Magnetic properties and cation ordering in two synthetic bornite samples, Cu5(Fe, Mn)S4

Miria Borgheresi; Francesco Di Benedetto; Andrea Caneschi; Maurizio Romanelli; David J. Vaughan

doi:10.2451/2011PM0009

Magnetic properties and cation ordering in two synthetic bornite samples, Cu5(Fe, Mn)S4

Miria Borgheresi, Francesco Di Benedetto, Andrea Caneschi, Maurizio Romanelli, David J. Vaughan

Research output: Contribution to journal › Article › peer-review

Abstract

The magnetic properties of a synthetic bornite, Cu5FeS 4, and of a Mn-bearing synthetic bornite were investigated using Superconducting Quantum Interference Device (SQUID) magnetometry and room temperature X-band Electron Paramagnetic Resonance (EPR) spectroscopy. Samples were synthesised from the elements using conventional dry methods. Chemical and phase compositions of the samples were confirmed by means of Electron Probe Micro-Analysis (EPMA) and by powder X-Ray Diffraction (XRD). Experimental results, interpreted using spectral simulations, highlight the superexchange nature of ionic interactions between paramagnetic centres and the role played by partial intervalence charge transfer between the Fe(III) and Cu(I) species in natural and synthetic bornite. The cation distribution in synthetic samples was shown to be different from the natural sample, in spite of the close similarity in chemical composition and structure.

Original language	English
Pages (from-to)	113-121
Number of pages	8
Journal	Periodico di Mineralogia
Volume	80
Issue number	1
DOIs	https://doi.org/10.2451/2011PM0009
Publication status	Published - Apr 2011

Keywords

Bornite
EPMA
EPR spectroscopy
Intervalence charge transfer
Mn(II)
SQUID magnetometry

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10.2451/2011PM0009

http://www.periodicodimineralogia.it/index.php/mineralogia/article/view/22/26

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title = "Magnetic properties and cation ordering in two synthetic bornite samples, Cu5(Fe, Mn)S4",

abstract = "The magnetic properties of a synthetic bornite, Cu5FeS 4, and of a Mn-bearing synthetic bornite were investigated using Superconducting Quantum Interference Device (SQUID) magnetometry and room temperature X-band Electron Paramagnetic Resonance (EPR) spectroscopy. Samples were synthesised from the elements using conventional dry methods. Chemical and phase compositions of the samples were confirmed by means of Electron Probe Micro-Analysis (EPMA) and by powder X-Ray Diffraction (XRD). Experimental results, interpreted using spectral simulations, highlight the superexchange nature of ionic interactions between paramagnetic centres and the role played by partial intervalence charge transfer between the Fe(III) and Cu(I) species in natural and synthetic bornite. The cation distribution in synthetic samples was shown to be different from the natural sample, in spite of the close similarity in chemical composition and structure.",

keywords = "Bornite, EPMA, EPR spectroscopy, Intervalence charge transfer, Mn(II), SQUID magnetometry",

author = "Miria Borgheresi and {Di Benedetto}, Francesco and Andrea Caneschi and Maurizio Romanelli and Vaughan, {David J.}",

year = "2011",

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doi = "10.2451/2011PM0009",

language = "English",

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TY - JOUR

T1 - Magnetic properties and cation ordering in two synthetic bornite samples, Cu5(Fe, Mn)S4

AU - Borgheresi, Miria

AU - Di Benedetto, Francesco

AU - Caneschi, Andrea

AU - Romanelli, Maurizio

AU - Vaughan, David J.

PY - 2011/4

Y1 - 2011/4

N2 - The magnetic properties of a synthetic bornite, Cu5FeS 4, and of a Mn-bearing synthetic bornite were investigated using Superconducting Quantum Interference Device (SQUID) magnetometry and room temperature X-band Electron Paramagnetic Resonance (EPR) spectroscopy. Samples were synthesised from the elements using conventional dry methods. Chemical and phase compositions of the samples were confirmed by means of Electron Probe Micro-Analysis (EPMA) and by powder X-Ray Diffraction (XRD). Experimental results, interpreted using spectral simulations, highlight the superexchange nature of ionic interactions between paramagnetic centres and the role played by partial intervalence charge transfer between the Fe(III) and Cu(I) species in natural and synthetic bornite. The cation distribution in synthetic samples was shown to be different from the natural sample, in spite of the close similarity in chemical composition and structure.

AB - The magnetic properties of a synthetic bornite, Cu5FeS 4, and of a Mn-bearing synthetic bornite were investigated using Superconducting Quantum Interference Device (SQUID) magnetometry and room temperature X-band Electron Paramagnetic Resonance (EPR) spectroscopy. Samples were synthesised from the elements using conventional dry methods. Chemical and phase compositions of the samples were confirmed by means of Electron Probe Micro-Analysis (EPMA) and by powder X-Ray Diffraction (XRD). Experimental results, interpreted using spectral simulations, highlight the superexchange nature of ionic interactions between paramagnetic centres and the role played by partial intervalence charge transfer between the Fe(III) and Cu(I) species in natural and synthetic bornite. The cation distribution in synthetic samples was shown to be different from the natural sample, in spite of the close similarity in chemical composition and structure.

KW - Bornite

KW - EPMA

KW - EPR spectroscopy

KW - Intervalence charge transfer

KW - Mn(II)

KW - SQUID magnetometry

U2 - 10.2451/2011PM0009

DO - 10.2451/2011PM0009

M3 - Article

SN - 0369-8963

VL - 80

SP - 113

EP - 121

JO - Periodico di Mineralogia

JF - Periodico di Mineralogia

IS - 1

ER -

Magnetic properties and cation ordering in two synthetic bornite samples, Cu5(Fe, Mn)S4

Abstract

Keywords

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