Structural, magnetic, and transport properties of RxBa1-xTiO3-.delta. solid solutions, where R = La, Nd, Gd, Er, and Y: rare-earth-dependent metal-to-semiconductor transitions

Eylem, C.; Sághi-Szabó, G.; Chen, Bai Hao; Eichhorn, Bryan W.; Jin, Peng; Greene, R. L.; Salamanca‐Riba, L.; Nahm, S.

doi:10.1021/cm00023a022

Cited by 47 publications

(24 citation statements)

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“…At the bulk level, the A 2+ and R 3+ cations are found to naturally disorder1314 in the titanates, and typically no charge and orbital-ordered Mott insulating phase is observed at half-doping15. An exception has been recently discovered for the case of very small A 2+ -cations, such as Ca 0.5 Lu 0.5 TiO 3 , where a rocksalt charge-ordered and d xy t 2 g orbital-ordered Mott insulating phase was recently proposed16.…”

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confidence: 99%

Ferromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites

et al. 2015

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In magnetic materials, the Pauli exclusion principle typically drives anti-alignment between electron spins on neighbouring species resulting in antiferromagnetic behaviour. Ferromagnetism exhibiting spontaneous spin alignment is a fairly rare behaviour, but once materialized is often associated with itinerant electrons in metals. Here we predict and rationalize robust ferromagnetism in an insulating oxide perovskite structure based on the popular titanate series. In half-doped layered titanates, the combination of Jahn–Teller and oxygen breathing motions opens a band gap and creates an unusual charge and orbital ordering of the Ti d electrons. It is argued that this intriguingly intricate electronic network favours the elusive inter-site ferromagnetic (FM) ordering, on the basis of intra-site Hund's rules. Finally, we find that the layered oxides are also ferroelectric with a spontaneous polarization approaching that of BaTiO3. The concepts are general and design principles of the technologically desirable FM ferroelectric multiferroics are presented.

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confidence: 99%

Ferromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites

et al. 2015

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“…RE ions are trivalent in most of their compounds, 14,15 and generally occupy Ba sites of BaTiO 3 . Charge equilibrium may be compensated by electrons, [16][17][18] A-site Ba vacancies, 19,20 B-site Ti vacancies 1,2,21,22 or the 3d 1 Ti 3ࢪ mode, [23][24][25] due to the different preparation techniques and ratios of starting compositions.…”

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Structure and Dielectric Properties of Eu-Doped Barium Titanate Ceramics

Koda

Suzuki

et al. 2005

J. Ceram. Soc. Japan

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Eu-doped BaTiO 3 ceramics EBT were prepared by the cold-pressing ceramic process on the basis of the formula Ba 1ࢬx Eu x Ti 1ࢬx8 O 3 xࢼ0.01-0.05, 0.10. The effects of Eu doping on the structure, microstructure, dielectric and ferroelectric properties of BaTiO 3 ceramics were studied. EBT ceramics have a high density, a low porosity and a fine grain size of 0.7-1.0 mm. As x3ಚ, EBT ceramics have a tetragonal perovskite structure. The Curie point decreases linearly at a rate of ࢬ11c Cmolಚ Eu ions with increasing Eu content up to 0.04. However, at x0.04, a secondary phase, Eu 2 Ti 2 O 7 , occurs and increases in concentration with increasing Eu, the Curie point remaining constant. The room-temperature dielectric constant of EBT ceramics eö RT ࢼ1600-3100 shows a temperature-independent dielectric region below 50c C at x0.04, a frequency stability below 10 6 Hz and good ageing resistance behavior.

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“…Since discovered more than four decades ago, most of UC materials have exhibited red, green and blue luminescence emission, which can match the absorption domain of conducting polymer in solar cells. Up to now, the UC luminescence properties of metal oxide families as host materials doped with Er 3+ have been widely investigated, such as silicon oxides [14], titanium oxides [15][16][17], phosphorus oxides [18,19], and molybdenum oxides [20,21]. All of these host materials show the excellent UC optical performances, however, so far the systems are largely a subject of fundamental research and lacks wide application.…”

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confidence: 99%

Tailoring solar energy spectrum for efficient organic/inorganic hybrid solar cells by up-conversion luminescence nanophosphors

Sun

Shao

et al. 2015

Electrochimica Acta

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Structural, magnetic, and transport properties of RxBa1-xTiO3-.delta. solid solutions, where R = La, Nd, Gd, Er, and Y: rare-earth-dependent metal-to-semiconductor transitions

Cited by 47 publications

References 1 publication

Ferromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites

Ferromagnetism induced by entangled charge and orbital orderings in ferroelectric titanate perovskites

Structure and Dielectric Properties of Eu-Doped Barium Titanate Ceramics

Tailoring solar energy spectrum for efficient organic/inorganic hybrid solar cells by up-conversion luminescence nanophosphors

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