Rare earths: jewels for functional materials of the future

Eliseeva, Svetlana V.; Bünzli, Jean‐Claude G.

doi:10.1039/c0nj00969e

Cited by 473 publications

(310 citation statements)

References 58 publications

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“…Each day we use at least one object containing lanthanides, like the cellphone or the credit card. Since the beginning of the 19th there seems to be an endless love story between the rare earths (Y, Sc, Ln) and the lighting applications [1]. Seen that the lanthanides are systems with lots of electrons and the first group of atoms containing f orbitals, they react different than the other groups.…”

Section: Introductionmentioning

confidence: 99%

Electronic structure and magnetic properties of lanthanide 3+ cations

Kurzen

Bovigny

Bulloni

et al. 2013

Chemical Physics Letters

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The magnetic properties of lanthanides are currently of great interest. Especially, the discovery that mononuclear complexes of rare earth (RE) ions can exhibit magnetic anisotropy and can act as single molecular magnets. Heretofore, the magnetic susceptibility of RE ions has often been estimated, using HUND's empirical formula. In this work, we propose a non-empirical calculation of magnetic susceptibilities of Ln(III) ions based on Van Vleck's formula, that accounts for all excited states within the f n manifold. The values obtained with Van Vleck's formula are much better than the ones with HUND's formula and are in good agreement with the experiments.

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Section: Introductionmentioning

confidence: 99%

Electronic structure and magnetic properties of lanthanide 3+ cations

Kurzen

Bovigny

Bulloni

et al. 2013

Chemical Physics Letters

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“…1 Diante de tantas aplicações, as propriedades luminescentes são de suma importância, a utilização em pequenas quantidades como ativadores ou dopantes em matrizes hospedeiras, preservam suas características espectroscópicas, tais como: tempo de vida na ordem de milissegundos, finas bandas de emissão e grande deslocamento Stokes. ) com níveis de menor energia, resultando na amplificação da luminescência, [8][9][10][11][12][13][14][15][16] a importância do uso do íon Bi 3+ tem sido mostrado na literatura como bom sensibilizador para a matriz YVO 4 .…”

Section: Introductionunclassified

EFEITO DA CONCENTRAÇÃO DOS ÍONS Eu3+ E Bi3+ NAS PROPRIEDADES FOTOLUMINESCENTE DA MATRIZ DE YVO4

Matos¹,

Faria²,

Ciuffi³

et al. 2018

Quim. Nova

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. Inorganic matrices have been extensively studied for several applications, mainly doped with lanthanoid ions presenting special spectroscopic properties. The radiation emission can be affected by several factors, such as; matrix, synthesis methodology, activating ions and sensitizers, and concentrations. Thus, in this work the matrix of yttrium vanadate doped with Eu 3+ ions as activator and Bi 3+ ions as sensitizer was prepared by the non-hydrolytic sol-gel methodology. Europium (III) and Bismuth (III) ions concentrations were varied in 1, 3 and 5% in mol with respect to the Y 3+ ion and the samples were heat treated at 1000 °C. The X-ray diffraction analyzes showed a single phase of the yttrium vanadate matrix, indicating the non-influence of the dopant ions on the crystalline structure. The dopants concentrations presented influences on the spectroscopic properties of the emitting ion, the intensity parameters (W 2 e W 4 ), increased as a function of the increase of Bi 3+ concentration, affecting the covalence of the bond and the rigidity of the system. The increase of Eu 3+ concentration directly affected its environment, decreasing the symmetry and increasing the quantum efficiency. Finally, increasing the dopant ions promoted the decreasing the crystallite size.Keywords: sol-gel non-hydolytic; Judd-Ofelt parameter; lifetime; quantum efficience. INTRODUÇÃOAtualmente a aplicação dos elementos lantanóides tem sido vasta, englobando craqueamento de petróleo, catalisador automotivo, imãs permanentes, lasers, ligas, eletrônica, iluminação, concentradores solares, bio-análises, imageamento, visão noturna, comunicação, entre outros. 1Diante de tantas aplicações, as propriedades luminescentes são de suma importância, a utilização em pequenas quantidades como ativadores ou dopantes em matrizes hospedeiras, preservam suas características espectroscópicas, tais como: tempo de vida na ordem de milissegundos, finas bandas de emissão e grande deslocamento Stokes. sendo a rota sol-gel não-hidrolítica importante para a formação dos óxidos inorgânicos, empregando solventes orgânicos e sais metáli-cos como precursores. Esta rota promove a formação de partículas inorgânicas de diversas formas e tamanhos influenciada pela escolha do solvente que atua como doador de oxigênio. 24 Uma variedade de redes hospedeiras podem ser obtidas por essa metodologia. 20,[25][26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41][42][43][44] Diante disso, o objetivo deste trabalho foi obter por meio do processo sol gel rota não-hidrolítica a matriz de YVO 4 dopadas com o íon ativador Eu 3+ e Bi 3+ como sensibilizador, ambos em diferentes concentrações com o intuito de promover a intensificação da emissão do íon Eu 3+ . As caracterizações foram realizadas através da difração de raios X para identificação da fase cristalina formada e fotoluminescência do íon Eu 3+ avaliando as propriedades espectroscópicas. EXPERIMENTAL Preparo dos precursoresOs precursores metálicos utilizados na preparação da matriz de YVO 4 , YCl 3 , EuCl 3 e VOCl ...

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“…В последние десятилетия редкозе-мельные металлы (РЗМ) становятся необходимыми для создания усовер-шенствованных материалов и техноло-гий с использованием катализаторов, сплавов, магнитов, оптики и лазеров, перезаряжаемых гидридных аккуму-ляторов, электроники, экономичного освещения, конверсии ветряной и сол-нечной энергии, биоанализа и модели-рования [1].…”

Section: Introductionunclassified

“…In recent decades the rare earth metals (REM) are required for creating of advanced materials and technologies using catalysts, alloys, magnets, optics and lasers, rechargeable hydride batteries, electronics, efficient lighting, conversion to wind and solar energy, bio-analysis and modeling [1].…”

Section: Introductionmentioning

confidence: 99%

Extractants for rare earth metals

2016

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The separation of trivalent rare earth metals is perhaps the most serious challenge associated with a closed fuel cycle. The choice of ligand as extractant, which must be selective and efficient in conditions of high radiation environment, plays an important role. In this review there are the main examples of extractants for f-elements used in the present 10-20 years. Экстрагенты для редкоземельных металловРазделение трехвалентных редкоземельных металлов, возможно, является самым се-рьезным вызовом, связанным с замкнутым топливным циклом. Важную роль играет выбор лиганда в качестве экстрагента, который должен быть селективным и надежным в условиях повышенной радиации среды. В данном обзоре приведены основные примеры экстрагентов для f-элементов, применяющихся в последнии 10-20 лет.Ключевые слова: редкоземельные металлы; фосфорорганические соединения; краунэ-фиры; поданды; каликсарены; амиды дигликолевой кислоты.

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Rare earths: jewels for functional materials of the future

Cited by 473 publications

References 58 publications

Electronic structure and magnetic properties of lanthanide 3+ cations

Electronic structure and magnetic properties of lanthanide 3+ cations

EFEITO DA CONCENTRAÇÃO DOS ÍONS Eu3+ E Bi3+ NAS PROPRIEDADES FOTOLUMINESCENTE DA MATRIZ DE YVO4

Extractants for rare earth metals

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