Structural evolutions of spinels under ions irradiations

Gosset, Dominique; Siméone, David; Dutheil, M.; Bouffard, S.; Beauvy, M.

doi:10.1016/j.jeurceramsoc.2005.03.122

Cited by 11 publications

(5 citation statements)

References 7 publications

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“…This result for MgAl 2 O 4 was in pact with previous experimental investigations on this compound, irradiated with low energy and swift heavy ions [56]. However, it is worth noting that these atomic positions cannot be occupied simultaneously in a same unit cell, because the distances between these sites are too short.…”

Section: Aluminate Spinel: Irradiation-tolerant Materialssupporting

confidence: 88%

“…Electron density is observed not only at the Wyckoff positions occupied by the atoms in the normal structure (8a, 16d and 32e) but also at the vacant Wyckoff positions 8b, 16c and 48f. This result for MgAl 2 O 4 was in pact with previous experimental investigations on this compound, irradiated with low energy and swift heavy ions [56]. However, it is worth noting that these atomic positions cannot be occupied simultaneously in a same unit cell, because the distances between these sites are too short.…”

Section: Characterisation Of Order–disorder Structuresupporting

confidence: 87%

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From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

Dwibedi

2017

Advances in Applied Ceramics

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Signature of cation flexibility associated with the order-disorder structure of three spinel families, namely aluminates (MgAl 2 O 4 /ZnAl 2 O 4 ), ferrites (NiFe 2 O 4 /Zn x Ni 1−x Fe 2 O 4 ), and titanate (Li 4 Ti 5 O 12 ) was probed using the X-ray diffraction and Raman spectroscopy. Cation flexibility (also known as antisite defects or (dis)order structural transitions) is a unique feature of many oxide AB 2 O 4 spinel systems in which the cations exchange their sites under external influence. This feature generates functionality in many different ways. In some cases, such as ferrites, the flexibility of zinc to occupy tetrahedral sites enhances the magnetic properties, whereas the flexibility of lithium in lithium titanate brings exotic electrochemical feature with zero strain. Similarly, cation flexibility of magnesium and aluminium makes the structure tolerant towards nuclear irradiation. Some such salient features of spinel systems are described highlighting the underlying crystal structures.Enriched with enormous chemical versatility, order-disorder structure, vacancy, interstitials and mixed-cation occupancy, 'Spinel is a world in itself'. This is why, exploring its huge accomplishments never gets enough. Ever wonder, where from this versatility stems in! This review endeavours to seek the answer by combining the flexible order-disorder structure, supporting diagnosis tools and tuneable properties of this versatile class: The Spinels.

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Section: Aluminate Spinel: Irradiation-tolerant Materialssupporting

confidence: 88%

Section: Characterisation Of Order–disorder Structuresupporting

confidence: 87%

From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

Dwibedi

2017

Advances in Applied Ceramics

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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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“…In the 'ideal' stoichiometric spinel, Mg cations occupy only T-site and Al cations occupy only O-site. Cation occupancy in natural spinel is nearly equivalent to the ideal case, but in synthetic spinel, part of Mg and Al cations occupy O-site and T-site, respectively [7,35,40].…”

Section: Theorymentioning

confidence: 98%

“…The degree of cation distribution in spinel has been determined by various methods such as IR (infrared spectroscopy) [4] and Raman spectroscopy [5][6][7], NMR (nuclear magnetic resonance) [3,[8][9][10], calorimetric measurements [11,12], neutron diffraction [13,14], and ALCHEMI (atom location by channeling enhanced microanalysis) [15].…”

Section: Introductionmentioning

confidence: 99%

Neutron irradiation effect on site distribution of cations in non-stoichiometric magnesium aluminate spinel

Sawabe

Yano

2008

Journal of Nuclear Materials

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Structural evolutions of spinels under ions irradiations

Cited by 11 publications

References 7 publications

From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

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

Neutron irradiation effect on site distribution of cations in non-stoichiometric magnesium aluminate spinel

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Structural evolutions of spinels under ions irradiations

Cited by 11 publications

References 7 publications

From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

From cation flexibility to multifaceted industrial adoptability: a voyage to the resourceful spinel

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

Neutron irradiation effect on site distribution of cations in non-stoichiometric magnesium aluminate spinel

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Product

Resources

About

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