Chemically induced order disorder transition in magnesium aluminium spinel

Barpanda, Prabeer; Behera, Satyananda; Gupta, Pradeep; Pratihar, Swadesh K.; Bhattacharya, Sanchari

doi:10.1016/j.jeurceramsoc.2005.04.032

Cited by 35 publications

(18 citation statements)

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“…There are several powder or single-crystal diffraction studies on MgAl 2 O 4 spinel after quenching from high temperature or even in situ at high temperature (e.g., Yamanaka and Takéuchi 1983;Peterson et al 1991;Redfern et al 1999;Andreozzi et al 2000;Andreozzi and Princivalle 2002;Méducin and Redfern 2004;Princivalle et al 2006;Barpanda et al 2006). Raman spectra at ambient conditions or at high temperature on natural or synthetic MgAl 2 O 4 spinel (Cynn et al 1992;Slotznick and Shim 2008;Malsy et al 2012) and also Cr 3+ photoluminescence spectra (Wood et al 1968;Mikenda and Preisinger 1981a, b;Mikenda, 1981;Derkosch and Mikenda 1983;Strek et al 1988;Phan et al 2004;Malsy et al 2012) of natural and synthetic spinel have been repeatedly measured and interpreted.…”

Section: Discussionmentioning

confidence: 99%

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Widmer

Malsy²,

Armbruster

2014

Phys Chem Minerals

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688 nm), and N3 (689 nm). N lines are caused by different Mg, Al environments of Cr 3+ . With increasing inversion parameter (x), the R line decreases in intensity and the N lines become prominent leading to strongly broadened peaks with a maximum shifted toward higher wave lengths (687.5 nm at 1,100 °C). Criteria for the detection of heat treatment on gemstone spinel applicable to gemological routine examination are provided. Extrapolation of u, a, and bond lengths from heat-treated Burma spinel toward the natural crystal suggests a retrograde "closing temperature" of ca. 400 ± 100 °C at which Mg, Al disorder was frozen.

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Section: Discussionmentioning

confidence: 99%

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Widmer

Malsy²,

Armbruster

2014

Phys Chem Minerals

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“…The spinel structure consists of a cubic close-packed array of oxide ions, in which one-eighth of the tetrahedral sites and one half of the octahedral sites are occupied by cations. [68][69][70] The structure of Co 3 O 4 spinel is illustrated as an example in Fig. 2a.…”

Section: General Aspects Of Spinel-type Transition Metal Oxidesmentioning

confidence: 99%

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Park

Kim

et al. 2015

Phys. Chem. Chem. Phys.

154

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. (2015). Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems. Physical Chemistry Chemical Physics, 17 (46), 30963-30977. Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems AbstractTransition metal oxides possessing two kinds of metals (denoted as AxB3-xO4, which is generally defined as a spinel structure; A, B = Co, Ni, Zn, Mn, Fe, etc.), with stoichiometric or even non-stoichiometric compositions, have recently attracted great interest in electrochemical energy storage systems (ESSs). The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale. Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed. The spinel-type transition metal oxides exhibit outstanding electrochemical activity and stability, and thus, they can play a key role in realising cost-effective and environmentally friendly ESSs. Moreover, porous nanoarchitectures can offer a large number of electrochemically active sites and, at the same time, facilitate transport of charge carriers (electrons and ions) during energy storage reactions. In the design of spinel-type transition metal oxides for energy storage applications, therefore, nanostructural engineering is one of the most essential approaches to achieving high electrochemical performance in ESSs. In this perspective, we introduce spinel-type transition metal oxides with various transition metals and present recent research advances in material design of spinel-type transition metal oxides with tunable architectures (shape, porosity, and size) and compositions on the micro-and nano-scale.Furthermore, their technological applications as electrode materials for next-generation ESSs, including metal-air batteries, lithium-ion batteries, and supercapacitors, are discussed.

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“…to replace

V_{Al}^{″'}

with

V_{normalMg}^{″} + {Mg}_{normalAl}^{'}

V_{Mg}^{″}

with

V_{normalAl}^{″'} + {Al}_{Mg}^{∙}

. Inversion is induced simply by heating to higher temperature and has been quantified by X‐ray diffraction (XRD), nuclear magnetic resonance (NMR), electron spin/paramagnetic resonance, neutron diffraction, optical absorption, Raman spectroscopy, and simulations …”

Section: Introductionmentioning

confidence: 99%

Fifty Years of Research and Development Coming to Fruition; Unraveling the Complex Interactions during Processing of Transparent Magnesium Aluminate (MgAl₂O₄) Spinel

et al. 2013

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The need for materials for demanding optical applications has engendered a resurgent interest in transparent ceramics. Transparent polycrystalline magnesium aluminate spinel is one especially promising and rapidly maturing technology that can fill this niche. Although it has been studied for over 50 yr, it is only recently that highly transparent components with acceptable mechanical properties have been reliably fabricated at reasonable cost. Development has been hindered by the inherent difficulty in sintering spinel to the near-theoretical density required for transparency, a high sensitivity to powder and processing parameters, variable stoichiometry, and a lack of understanding of the synthesis-processing-property relationships. The driver of recent success is an emerging understanding of complex, multiscale, multivariable interactions that occur during green-body formation and sintering. In particular, certain key variables play a decisive role in determining compact properties and their evolution must be controlled from synthesis to the finished product. This article features the interactions between these key variables during processing and gives an expos e of the state of the art in transparent polycrystalline spinel fabrication.

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Chemically induced order disorder transition in magnesium aluminium spinel

Cited by 35 publications

References 12 publications

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Fifty Years of Research and Development Coming to Fruition; Unraveling the Complex Interactions during Processing of Transparent Magnesium Aluminate (MgAl₂O₄) Spinel

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Chemically induced order disorder transition in magnesium aluminium spinel

Cited by 35 publications

References 12 publications

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Effects of heat treatment on red gemstone spinel: single-crystal X-ray, Raman, and photoluminescence study

Porous nanoarchitectures of spinel-type transition metal oxides for electrochemical energy storage systems

Fifty Years of Research and Development Coming to Fruition; Unraveling the Complex Interactions during Processing of Transparent Magnesium Aluminate (MgAl2O4) Spinel

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Fifty Years of Research and Development Coming to Fruition; Unraveling the Complex Interactions during Processing of Transparent Magnesium Aluminate (MgAl₂O₄) Spinel