Structures of nonlinear hexagonal boratotungstates Ln3BWO9 (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy)

Крутько, В. А.; Belik, Alexei А.; Lysanova, G. V.

doi:10.1134/s0036023606060064

Cited by 14 publications

(10 citation statements)

References 3 publications

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“…The observed XRD spectra can be indexed into hexagonal coordinated structure with space group P63 (No.173), without other detected impurity phases. To obtain detailed structural information, the crystal structure is refined using La3BWO9 as a starting model by Rietveld method, the lattice parameters including lattice constants and atomic positions of RE3BWO9 (La, Pr,Nd, Gd-Ho) boratotungstates are consistent with the prior reports, 21 as listed in Table 1. The refinement yields a good fit between the observed and simulated profiles with refinement reliability factors Rp (2.79-4.86) and Rwp (4.05 -6.52).…”

Section:  Results and Discussionmentioning

confidence: 71%

“…Here, we report the synthesis, structure and magnetic properties of new RE-based frustrated antiferromagnets, RE3BWO9 (La, Pr, Nd, Gd-Ho) boratotungstates, crystallized into the hexagonal structure with P63 space group. 21 The RE 3+ ions carrying magnetic spins are arranged on a distorted 3 Kagomé lattice within the ab plane and stacked in an alternating AB type fashion along c axis. For this serial compounds, both magnetic RE 3+ ions and nonmagnetic W 6+ /B 3+ cations form the ordered state where chemically antisite disorder are well avoided thanks to their large difference of ionic radii and coordination number in these boratotungstates.…”

Section: Vesignieitementioning

confidence: 99%

“…Here, we report the synthesis, structure, and magnetic properties of new RE-based frustrated antiferromagnets, RE 3 BWO 9 (RE = Pr, Nd, Gd–Ho) boratotungstates, crystallized into the hexagonal structure with the P 6 3 space group . The RE 3+ ions carrying magnetic spins are arranged on a distorted Kagomé lattice within the ab plane and are stacked in an alternating AB-type fashion along the c axis.…”

Section: Introductionmentioning

confidence: 99%

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A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

et al. 2020

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Exploration of rare-earth (RE)-based Kagomé lattice magnets with spin-orbital entangled jeff=1/2 moments will provide new platform for investigating the exotic magnetic phases. Here, we report a new family of RE3BWO9 (RE=Pr,Nd,Gd-Ho) boratotungstates with magnetic RE 3+ ions arranged on Kagomѐ lattice, and perform its structure and magnetic characterizations. This serial compounds crystallize in hexagonal coordinated structure with space group P63 (No.173), where magnetic RE 3+ ions have distorted Kagomé lattice connections within the ab plane and stacked in a AB-type fashion along c axis. The interlayer RE-RE separation is comparable with that of intralayer distance, forming 3-dimensional (3D) exchange coupled magnetic framework of RE 3+ ions. The magnetic susceptibility data of RE3BWO9 (RE=Pr, Nd, Gd-Ho) reveal dominant antiferromagnetic interactions between magnetic RE 3+ ions, but without visible magnetic ordering down to 2 K. The magnetization analyses for different RE 3+ ions show diverse anisotropic behaviors, make RE3BWO9 as an appealing Kagomé-lattice antiferromagnet to explore exotic magnetic phases.

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Section:  Results and Discussionmentioning

confidence: 71%

Section: Vesignieitementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

et al. 2020

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“…22−24 Originally, the crystal structures of these compounds were defined as hexagonal with P6 3 space group by single-crystal Xray diffraction. 25,26 There are single sites occupied by BO , and Ln 3+ ions in the lattice. Inspired by these, we selected La 3 BWO 9 as the host compound to develop a yellow-emitting La 3 BWO 9 :Bi 3+ (LBW:Bi 3+ ) phosphor with strong NUV excitation.…”

Section: Introductionmentioning

confidence: 99%

Redefinition of Crystal Structure and Bi³⁺ Yellow Luminescence with Strong Near-Ultraviolet Excitation in La₃BWO₉:Bi³⁺ Phosphor for White Light-Emitting Diodes

Han

Pan

Мolokeev

et al. 2018

ACS Appl. Mater. Interfaces

148

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Bi-activated photonic materials have received increased interest recently because they can be excited effectively with near-ultraviolet (NUV) but not visible light, thereby avoiding the reabsorption among phosphors, which cannot be solved intrinsically by traditional rare earth (e.g., Eu, Ce) phosphors. Such unique property suggests their potential application in NUV chip-based WLEDs. However, few Bi phosphors exhibit strong excitation peak in NUV, though the excitation tail of some can extend to NUV. Herein, we report a novel yellow-emitting LaBWO:Bi (LBW:Bi) phosphor with strong NUV excitation. The photoluminescence (PL) spectroscopy analysis indicates that there are two Bi luminescent centers in LBW:Bi phosphor, which is clearly in contradiction with the established hexagonal structure of LaBWO with P6 space group because only one La site in this structure can accommodate Bi ions. Combining the luminescent properties of Bi with Rietveld refinement, LaBWO was redefined as a trigonal structure with the lower space group of P3 in which there are two independent crystallographic La sites. In addition, the rationalization of P3 space group was further confirmed by the finding of the reflection (0001) according to the extinction rule. Therefore, the PL behavior of Bi can act as a complementary tool to determinate the real crystal structure especially when it is hard to distinguish by conventional X-ray diffraction techniques.

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“…Among them, the RE tungstates in combination with borate are the new type compounds. One of the promising borotungstates is Ln 3 BWO 9 (Ln=La, Pr, Nd, Sm‐Ho) 16–19 . Nd 3 BWO 9 is suitable as high‐neodymium‐content laser crystal for microchip laser applications 20 .…”

Section: Introductionmentioning

confidence: 99%

The Luminescence Properties of Eu³⁺‐Doped Borotungstate Gd₄B₂WO₁₂ Phosphors

Zhu

Huang

Seo

2011

Journal of the American Ceramic Society

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The new red-emitting phosphors of Eu 31 -doped borotungstate Gd 4 B 2 WO 12 were prepared by the high-temperature solid-state reaction. The phosphors were characterized by X-ray powder diffraction technique. The photoluminescence excitation and emission spectra, the fluorescence decay curves and the dependence of luminescence intensity on temperature were investigated. The phosphor can be efficiently excited by near UV light to realize an intense red luminescence (618 nm) corresponding to the electric dipole transition 5 D 0 -7 F 2 of Eu 31 ions. The crystallographic site-occupations of the Eu 31 ions in Eu 4 B 2 WO 12 were investigated by the site-selective excitation and emission spectra, and the fluorescence decay curves in the 5 D 0 -7 F 0 region using a pulsed, tunable, and narrowband dye laser. The concentration quenching of the red luminescence together with the thermal stability were discussed on the base of the Eu 31 site-distributions in Eu 4 B 2 WO 12 host.

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Structures of nonlinear hexagonal boratotungstates Ln3BWO9 (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy)

Cited by 14 publications

References 3 publications

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

Redefinition of Crystal Structure and Bi³⁺ Yellow Luminescence with Strong Near-Ultraviolet Excitation in La₃BWO₉:Bi³⁺ Phosphor for White Light-Emitting Diodes

The Luminescence Properties of Eu³⁺‐Doped Borotungstate Gd₄B₂WO₁₂ Phosphors

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Structures of nonlinear hexagonal boratotungstates Ln3BWO9 (Ln = La, Pr, Nd, Sm, Gd, Tb, Dy)

Cited by 14 publications

References 3 publications

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE3BWO9 (RE = Pr, Nd, Gd–Ho) Boratotungstates

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE3BWO9 (RE = Pr, Nd, Gd–Ho) Boratotungstates

Redefinition of Crystal Structure and Bi3+ Yellow Luminescence with Strong Near-Ultraviolet Excitation in La3BWO9:Bi3+ Phosphor for White Light-Emitting Diodes

The Luminescence Properties of Eu3+‐Doped Borotungstate Gd4B2WO12 Phosphors

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A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

A New Family of Disorder-Free Rare-Earth-Based Kagome Lattice Magnets: Structure and Magnetic Characterizations of RE₃BWO₉ (RE = Pr, Nd, Gd–Ho) Boratotungstates

Redefinition of Crystal Structure and Bi³⁺ Yellow Luminescence with Strong Near-Ultraviolet Excitation in La₃BWO₉:Bi³⁺ Phosphor for White Light-Emitting Diodes

The Luminescence Properties of Eu³⁺‐Doped Borotungstate Gd₄B₂WO₁₂ Phosphors