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beta-ferrite

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Journal Article
Published: 01 March 2001
European Journal of Mineralogy (2001) 13 (2): 391–402.
... coordination constrains Fe 3+ to octahedral sites. The topochemistry of franklinite, as well as that of MnFe 3+ 2 O 4 and CdFe 3+ 2 O 4 , is therefore completely different with respect to other ferrites and shows more similarities with the Zn aluminate gahnite (ZnAl 2 O 4 ). A very small fraction of VI Zn...
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Journal Article
Published: 26 March 2020
Mineralogical Magazine (2020) 84 (3): 376–380.
..., 1993 ). It has the block stacking sequence ⋅ RSSR * S * S *⋅ and thus a different topology than magnetoplumbite. Lindqvistite is consequently not counted as a member of the magnetoplumbite group. Galuskin et al. ( 2018 ) have reported closely related Ba- and K-dominant ferrites from Jabel Harmun...
FIGURES
Journal Article
Published: 01 January 2005
American Mineralogist (2005) 90 (1): 219–228.
...) for a random arrangement of cations, to Q = −0.5 in inverse spinel. The relationship between Q and x is: Q = 1 – (3/2) x . MgFe 2 O 4 is partly inverse and partly normal and is, therefore, one of the most interesting ferrite spinels ( Paladino 1960 ). The background was modeled using a Chebyschev...
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Journal Article
Published: 01 October 2000
American Mineralogist (2000) 85 (10): 1497–1502.
... as a function of T . The data analysis combined Rietveld structure refinements with minimization techniques. The thermodynamic behavior of the thermally activated order-disorder transformation occurring in Zn-ferrite was interpreted by the O’Neill-Navrotsky model (α = 49.3 ± 0.4 and β = −31.6 ± 2.0 kJ/mol...
FIGURES
Journal Article
Published: 01 January 2012
Reviews in Mineralogy and Geochemistry (2012) 74 (1): 101–146.
..., predominantly the beta and occasionally the alpha form. Pure dicalcium silicate is also called C 2 S, which may also use a prefix (β, α, γ) to indicate the specific form; the impure industrial product is termed belite. Etched polished sections can expose the lamellar structure of belite, and is useful...
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Journal Article
Journal: Economic Geology
Published: 01 March 2013
Economic Geology (2013) 108 (2): 355–364.
...-type No G Yilgarn craton EGS - Kurnalpi terrane Murphy Well 2.7 Komatiite Munro-type No G Yilgarn craton EGS - Burtville, Gerry Well GB Collurabbie - Beta 2.7 Kom. basalt Munro-type Yes G Yilgarn craton EGS - Burtville, Gerry Well GB Collurabbie - Gamma 2.7 Kom. basalt...
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Journal Article
Journal: The Leading Edge
Published: 01 August 2015
The Leading Edge (2015) 34 (8): 944–947.
... of data on them. The additional cost might run to hundreds of thousands of dollars for a seismic survey. An advantage of the latest tape media is reliability. The TS1150 cartridge uses a barium ferrite medium, which promises to have increased stability compared with older media types (stable for 30...
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Journal Article
Published: 01 July 2005
European Journal of Mineralogy (2005) 17 (4): 581–586.
...[fleqn,10pt,legalpaper]{article} \usepackage{amssymb} \usepackage{amsfonts} \usepackage{amsmath} \pagestyle{empty} \begin{document} \[{\Delta}G_{D}(x)\ =\ {\alpha}x\ {+}\ 2{\beta}x^{2}\ -\ T{\sigma}x\ {+}\ RT\left({{\Sigma}_{M,b}}n_{b}X_{M}^{b}lnX_{M}^{b}\right)\] \end{document} At equilibrium...
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Journal Article
Published: 01 February 2011
American Mineralogist (2011) 96 (2-3): 437–443.
...}}^{\mathit{S}}_{polarization}^{}}\ {\varepsilon}_{{\alpha}}\ {-}\ {{\sum}_{{\alpha}}^{}}{{\sum}_{\mathit{k}}^{}}\ {\mathit{F}_{{\alpha}}^{0}\ {\tau}_{{\kappa}{\alpha}}_{forces}^{}}\\&&{-}{\Omega}_{0}\ /\ 2{{\sum}_{{\alpha}{\beta}}^{}}{{\chi}_{{\alpha}{\beta}}^{{\infty}(1)}\ {\varepsilon}_{{\alpha...
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Journal Article
Published: 01 August 2002
American Mineralogist (2002) 87 (8-9): 1113–1120.
... are widespread in most geological environments. A complete solid solution exists between spinel sensu stricto (s.s.), MgAl 2 O 4 , and hercynite, FeAl 2 O 4 , whereas a large immiscibility gap is observed between hercynite and Mg-Fe 2+ -ferrites ( Turnock and Eugster 1962 ; Lehmann and Roux 1986...
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Journal Article
Journal: Elements
Published: 01 October 2022
Elements (2022) 18 (5): 301–307.
... temperatures, alumino-ferrites of lime (C 4 AF) and C 2 S form. In current quick-setting cements, the main silicate is C 2 S and the main aluminates are C 3 A and C 4 AF. Other components are C 3 S, calcite, and spurrite (Ca 5 (SiO 4 ) 2 CO 3 ), as well as C 12 A 7 and C 2 AS. Slow-setting natural cement...
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Journal Article
Published: 01 October 2003
American Mineralogist (2003) 88 (10): 1522–1531.
...({-}{\beta}(\mathit{U}_{old}\ {-}\ \mathit{U}_{new}))\frac{\mathit{W}_{new}}{\mathit{W}_{old}}\right]\] \end{document} Use of the exchange-bias technique with k = 10 makes possible Monte Carlo simulations with a successful exchange rate of Mg 2+ and Al 3+ in MgAl 2 O 4 of 15% at 1000 K and as high...
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Journal Article
Published: 01 August 2014
European Journal of Mineralogy (2014) 26 (4): 457–471.
..., nanostructured material, obviously, must be highly magnetic, as in the case of complex ferrites. Furthermore, nanoparticles should exhibit good crystallinity and their size should be carefully controlled, so the particles still remain in a monodomain state ( Hernando et al. , 2005 ; Reiss & Huetten, 2005...
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Journal Article
Published: 01 August 2009
American Mineralogist (2009) 94 (8-9): 1120–1129.
... susceptibility. Similar superparamagnetic susceptibility behavior was observed in particle assemblages of lithium ferrite ( Verma and Joy 2005 ). F igure 9. Mass-normalized in-phase susceptibility as a function of temperature for the magnetite-coated clay samples. Experiments were conducted in argon...
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Journal Article
Published: 01 January 2006
Reviews in Mineralogy and Geochemistry (2006) 63 (1): 99–111.
... method it was found that the raw material contained sideroplesite and ankerite with different proportions of Mg, Ca and Mn in addition to Fe. Furthermore, wuestite (FeO), hematite (Fe 2 O 3 ), magnetite (Fe 3 O 4 ) and complex ferrites with different cation ratios may be present. The result...
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Journal Article
Published: 01 January 2012
Reviews in Mineralogy and Geochemistry (2012) 74 (1): 1–82.
... scattered image of a polished section of CAC (fraction >63 μm). Description of phases. CA, dark grey, ferrite, white, C 2 S, white grey, spinel, bright white. Copyright from “Calcium and Calcium Aluminate Cements” edited by R.J. Mangabhai and F.P. Glasser, London, IOM Communications (2001...
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Journal Article
Published: 01 February 2015
American Mineralogist (2015) 100 (2-3): 644–651.
.... ( 2006 ) Electric field-induced unmixing in mixed ferrite spinel (Co,Fe) 3 O 4 . Advances in Science and Technology , 46 , 11 – 20 . Ito M. Nagi Y. Kado N. Urukawa S. Ogawa T. Kondo A. Koyama K. Watanabe K. Kindo K. ( 2011 ) Magnetic properties of spinel...
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Journal Article
Published: 01 May 2003
American Mineralogist (2003) 88 (5-6): 860–865.
... is the temperature-dependent disordering of the A and B cations between the octahedrally and tetrahedrally coordinated sites. This cation order-disorder may influence many of the physical properties of a spinel crystal; for example, the magnetic properties of the ferrite spinels (2–3 spinels with B = Fe 3...
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Journal Article
Published: 01 August 2007
American Mineralogist (2007) 92 (8-9): 1334–1345.
... studies of certain doped nickel ferrites . Journal of Physics C: Solid State Physics , 4 , 2266 – 2268 . Tucker , M.G. , Keen , D.A. , and Dove , M.T. ( 2001 a) A detailed structural characterization of quartz on heating through the alpha-beta phase transition . Mineralogical...
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Journal Article
Published: 01 January 2010
Reviews in Mineralogy and Geochemistry (2010) 71 (1): 465–484.
...}({\sigma}_{\mathit{ij}},\mathit{T},\mathit{n}_{{\beta}})\ =\ {{\sum}_{{\beta}}^{}}\mathit{n}_{{\beta}}{\mu}_{{\beta}}({\sigma}_{\mathit{ij}},\mathit{T},\mathit{n}_{{\beta}})\ =\ {{\sum}_{{\beta}}^{}}\mathit{n}_{{\beta}[}\mathit{G}_{{\beta}}({\sigma}_{\mathit{ij}},\mathit{T})+\mathit{RT}\ ln\ \mathit...
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