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Waanders, F.B.; Vorster, S. W.; Pollak, H.

doi:10.1023/a:1017012831969

Cited by 16 publications

(5 citation statements)

References 2 publications

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“…Since hydroxide brucite-like layers of valleriite may contain both Fe 3+ and Fe 2+ atoms, detected doublets can be attributed to valleriite brucite-like layers. On the other hand in accordance with [8] the first doublet can also be consistent with tetrahedrally coordinated Fe 3+ atoms in sulfide layers. Moreover relative intensities of quadrupole doublets corresponding to divalent Fe cations are much lower than relative intensities of quadrupole doublets corresponding to trivalent Fe cations.…”

Section: Resultssupporting

confidence: 76%

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Mössbauer investigations of synthetic valleriite

et al. 2011

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Samples obtained as a result of the valleriite synthesis process under different conditions (temperature and proportion Cu:Fe:Mg in the initial mixture) were investigated by 57 Fe Mössbauer spectroscopy with attraction data of X-ray diffraction. Parameters of hyperfine interactions for valleriite were determined and crystal chemical identification of 57 Fe subspectra was carried out. It was found that valleriite was formed in samples synthesized at 150 • C and 180 • C and not formed in samples synthesized at 250 • C.

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Section: Resultssupporting

confidence: 76%

“…Mössbauer spectra of valleriite in[8] were processed by four quadrupole doublets. The doublet with similar parameters δ = 0.42 ÷ 0.42 mm/s and = 1.12 ÷ 1.32 mm/s was attributed to Fe 2+ atoms and doublets with δ = 0.24 ÷ 0.41 mm/s and = 0.74 ÷ 0.89 mm/s -to Fe 3+ in sulfide layer respectively.…”

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confidence: 99%

Mössbauer investigations of synthetic valleriite

et al. 2011

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“…The materials, including a number of naturally occurring minerals, formed by alternating 2D sheets of incommensurate metal chalcogenides and Mg, Na, Li hydroxides, which are believed to be stacked by the opposite electrical charges, have been much less studied. Valleriite (CuFeS 2 )Á(Mg,Al,-Fe)(OH) 2 [19][20][21][22][23][24][25][26][27] and tochilinite mFeSÁn(Mg,Fe)(OH) 2 [30][31][32][33][34][35][36] are the most known of them; particularly, valleriite ores of the Noril'sk ore provenance (Russia) are of commercial importance but not involved in the exploitation because of the lack of processing technologies. Synthetic valleriite and tochilinite have been prepared and characterized too; [37][38][39][40][41][42][43][44][45][46][47][48][49][50][51] however, the yield of the substances was typically lower than 50%, and those were substantially contaminated by the reaction by-products.…”

Section: Introductionmentioning

confidence: 99%

Facile synthesis and selected characteristics of two-dimensional material composed of iron sulfide and magnesium-based hydroxide layers (tochilinite)

et al. 2023

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“…to that found by Waanders et al [2]. This magnetic field strength was used to calculate the Cr-percentage in the material, which was found to be a 20 wt.% Crcomposition when the theoretical relation , H av = 33.0 1-29.6 1c, was used [3], in accordance (within 10% error) with the known chemic al comp osition of the material.…”

Section: Resultsmentioning

confidence: 80%

Retained Austenite Phase in (26.5%Cr, 2.6%C) White Cast Iron Studied by Means of CEMS and Eddy Current

Mulaba‐Bafubiandi¹,

Waanders

Jones³

2002

Industrial Applications of the Mössbauer Effect

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Abstract. High chrome white irons are specifically employed in the mining industry for their resistance to wear. More cost-effective materials are constantly being sought, due to the high wear rate of the drilling components, which is a high cost area for this industry. Optimum resistance to wear is often not the main criterion of material selection but parameters such as ease of fabrication; availability and low initial cost have also to be accounted for. A correctly heat-treated high chrom e white iron of a right chemical composition presents the best hardness and toughness combination [I I.A (26.5 wt.% Cr, 2.6 wt.% C) white iron has been produced by casting and heat-treating. As the retained austenite phase has the ability to harden, the control of its content may result in tuning the applications of this material. Various heat-treatments were given to the above-mentioned material to achieve a spread of austenite values. The retained austenite phase amount was measured by means of X-ray diffraction (XRD), Conversion Electro n Mossbauer spectroscopy (CEMS) and Eddy current techniques. A linear correlation between results from Eddy Current and CEMS , Eddy-current and XRD, and between those from CEMS and XRD was observed. As the nominal abundance values were "tec hnique dependent", their conversion will be discussed. The present study results in the calibration of the Eddy current apparatus and suggests its application in the casting industry during mass production for the retained austenite content determin ation in high chrome white iron castings.

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Cited by 16 publications

References 2 publications

Mössbauer investigations of synthetic valleriite

Mössbauer investigations of synthetic valleriite

Facile synthesis and selected characteristics of two-dimensional material composed of iron sulfide and magnesium-based hydroxide layers (tochilinite)

Retained Austenite Phase in (26.5%Cr, 2.6%C) White Cast Iron Studied by Means of CEMS and Eddy Current

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