Control of polymorphism in NaNbO<sub>3</sub>by hydrothermal synthesis

Modeshia, Deena R.; Darton, Richard J.; Ashbrook, Sharon E.; Walton, Richard I.

doi:10.1039/b814601b

Cited by 69 publications

(54 citation statements)

References 30 publications

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“…[255][256][257][258][259] As high intensities and time resolutions (timescale of seconds) are indispensable for in situ studies, these studies are mostly performed with position-sensitive detectors and polychromatic radiation. In the course of these energy-dispersive X-ray diffraction (EDXRD) techniques, data are collected with a fixed-angle solid-state photon-counting and energy-discriminating detector and the Bragg diffraction is recorded as a function of the energy instead of the commonly used diffraction angle.…”

Section: In Situ Powder Diffraction Techniquesmentioning

confidence: 99%

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

et al. 2010

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Oxide nanomaterials are indispensable for nanotechnological innovations, because they combine an infinite variety of structural motifs and properties with manifold morphological features. Given that new oxide materials are almost reported on a daily basis, considerable synthetic and technological work remains to be done to fully exploit this ever increasing family of compounds for innovative nano-applications. This calls for reliable and scalable preparative approaches to oxide nanomaterials and their development remains a challenge for many complex nanostructured oxides. Oxide nanomaterials with special physicochemical features and unusual morphologies are still difficult to access by classic synthetic pathways. The limitless options for creating nano-oxide building blocks open up new technological perspectives with the potential to revolutionize areas ranging from data processing to biocatalysis. Oxide nanotechnology of the 21st century thus needs a strong interplay of preparative creativity, analytical skills, and new ideas for synergistic implementations.

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Section: In Situ Powder Diffraction Techniquesmentioning

confidence: 99%

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

et al. 2010

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“…NaNbO 3 is well-known to exhibit a rich polymorphism based on the perovskite structure, with a number of displacive transition occurring over a range of temperatures, which may also be sensitive to both pressure and crystallite size. Doped forms of the material are currently the focus of much attention because of their piezoelectric properties (Modeshia et al 2009). Much work has been carried out on the synthesis of alkaline niobates because of their excellent nonlinear optical, ferroelectric, piezoelectric, electro-optic, ionic conductive, pyroelectric, photorefractive, selective ion exchange and photocatalytic properties.…”

Section: Technologically Important Mineralsmentioning

confidence: 99%

The discovery of new mineral species and type minerals from Brazil

Atencio

2015

Braz. J. Geol.

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RESUMO:Os minerais foram vistos apenas como fontes de produtos químicos: minério de ferro, minério de cobre, etc. No entanto, não são apenas associações de elementos químicos, uma vez que apresentam estruturas cristalinas. Essas duas características em conjunto proporcionam propriedades que podem ser tecnologicamente úteis. Mesmo que um mineral ocorra em quantidade muito pequena, o que não permite a sua extração, pode servir como um modelo para a obtenção do análogo sintético em uma escala industrial. É necessário que uma proposta de novo mineral seja submetida à aprovação pela Comissão de Novos Minerais, Nomenclatura e Classificação (CNMNC) da Associação Mineralógica Internacional (IMA) antes da publicação. Somente 65 espécies minerais válidas foram descritas pela primeira vez no Brasil, isto é, minerais-tipo do Brasil. Dezenove delas foram publicadas entre 1789 e 1959 (0,11 por ano). De 1959, quando a CNMMN (hoje CNMNC) -IMA foi criada, até 2000, 18 espécies minerais brasileiras aprovadas permanecem válidas (0,43 por ano). No entanto, o número de minerais-tipo do Brasil aprovados nos últimos 15 anos (2000 -2014) foi substancialmente maior: 28 (1,87 por ano). Esse número é muito pequeno considerando a grande variedade de ambientes geológicos brasileiros. As duas primeiras espécies-tipo do Brasil, descobertas no século 18, crisoberilo e euclásio, são importantes minerais gemológicos. Dois outros minerais-gema, membros do supergrupo da turmalina, foram publicados apenas no século 21: uvita e fluor-elbaíta. Alguns minerais-tipo do Brasil são muito importantes tecnologicamente falando. Alguns exemplos são menezesita, coutinhoíta, lindbergita, pauloabibita e waimirita-(Y). menezesite, coutinhoite, lindbergite, pauloabibite, and waimirite-(Y). PALAVRAS-CHAVES:

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“…NaNbO 3 also exhibits complex polymorphism related from the synthetic route used. A polar polymorph may be synthesised when a sol-gel method is used and the ilmenite polymorph of NaNbO 3 can only be prepared via hydrothermal synthesis [18,19]; by adjusting the hydrothermal reaction conditions, a perovskite polymorph may be obtained [19]. NaNbO 3 also displays crystallite size related polymorphism [20].…”

Section: Introductionmentioning

confidence: 99%

From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd2Zr2O7

Payne

Tucker

Evans

2013

Journal of Solid State Chemistry

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NOTICE: this is the author's version of a work that was accepted for publication in Journal of solid state chemistry. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be re ected in this document. Changes may have been made to this work since it was submitted for publication. A de nitive version was subsequently published in Journal of solid state chemistry, 255, 2013, 10.1016/j.jssc.2013.07.001 Additional information: Use policyThe full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-pro t purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details. AbstractThe structural characterisation of Nd 2 Zr 2 O 7 prepared via a precursor route was performed using a combination of local and average structure probes (neutron total scattering, X-ray and neutron diffraction). We present the first total scattering and reverse Monte Carlo (RMC) modelling study of Nd 2 Zr 2 O 7 , which provides compelling evidence for the adoption of a disordered fluorite-type structure by Nd 2 Zr 2 O 7 prepared by a low-temperature precursor route.Annealing the material at high temperatures leads to a transformation to a pyrochlore-type structure; however, Rietveld refinement using powder neutron diffraction data shows that the oxygen sublattice retains a degree of disorder.

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Control of polymorphism in NaNbO₃by hydrothermal synthesis

Cited by 69 publications

References 30 publications

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

The discovery of new mineral species and type minerals from Brazil

From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd2Zr2O7

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Control of polymorphism in NaNbO3by hydrothermal synthesis

Cited by 69 publications

References 30 publications

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

Oxide Nanomaterials: Synthetic Developments, Mechanistic Studies, and Technological Innovations

The discovery of new mineral species and type minerals from Brazil

From fluorite to pyrochlore: Characterisation of local and average structure of neodymium zirconate, Nd2Zr2O7

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Control of polymorphism in NaNbO₃by hydrothermal synthesis