Phase transformations in Li2WO4 at high pressure

Yamaoka, Shinobu; Fukunaga, Osamu; Ono, Terumasa; Iizuka, Eiichi; Asami, Seiichi

doi:10.1016/0022-4596(73)90191-6

Cited by 16 publications

(5 citation statements)

References 10 publications

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“…33 Yamaoka et al confirmed the presence of three additional phases of Li 2 WO 4 at high pressure and temperature. 34 XRD pattern and crystal structure of LWO powder calcined at 600 °C are shown in Figures S1 and 1, respectively, which is well-matched with the rhombohedral structure suggested by Zachariasen having space group R3̅ (148). The XRD pattern of sample was similar to the calcined powder.…”

Section: ■ Experimental Sectionsupporting

confidence: 73%

“…LWO possesses polymorphic behavior, with four different crystal structures in which phenakite type structure (Li 2 WO 4 –I) is the most stable under atmospheric pressure. , In 1926, Zachariasen first reported the structural behavior of Li 2 WO 4 and later the phenakite type structure was confirmed by Moon . Yamaoka et al confirmed the presence of three additional phases of Li 2 WO 4 at high pressure and temperature . XRD pattern and crystal structure of LWO powder calcined at 600 °C are shown in Figures S1 and , respectively, which is well-matched with the rhombohedral structure suggested by Zachariasen having space group R 3̅(148).…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Arun

Kim

Lee

et al. 2018

ACS Sustainable Chem. Eng.

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Ultra-low-temperature co-fireable Li2WO4 substrate has been developed using an environmental friendly tape-casting technique. The nonaqueous tape-casting slurry comprised of an eco-friendly binder-solvent system consisting of polypropylene carbonate as binder and dimethyl carbonate as solvent. The structural, thermal, morphological, rheological, and electrical properties of the sintered substrate is investigated. The bulk ceramics sintered at 650 °C possess a relatively high thermal expansion coefficient of about 16 ppm/°C. The thermal conductivity of sintered tape measured at room temperature was about 2.6 W/m·K. The sintered substrate exhibits excellent microwave dielectric properties with a relative permittivity of 5.4 and a very low dielectric loss of 9.21 × 10–5 at 5 GHz and is co-fireable with Ag electrode.

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Section: ■ Experimental Sectionsupporting

confidence: 73%

Section: Resultsmentioning

confidence: 99%

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Arun

Kim

Lee

et al. 2018

ACS Sustainable Chem. Eng.

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“…In the case of O 2 /Ar plasma exposure during the LbL film growth and post-plasma oxidation, the possible reactions of oxygen atoms O g in the sputtering plasma diffuse into the growing subsurface, and the subsequent possible elemental reaction with O-and Zn-related defects occurs as follows, although the contribution of excited Ar states was not considered here: 29,30) O…”

Section: Discussionmentioning

confidence: 99%

Chemical Activity of Oxygen Atoms in Magnetron Sputter-Deposited ZnO Films during Film Growth

Morita

Watanabe

Ohta

et al. 2011

Jpn. J. Appl. Phys.

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The role of oxygen atoms in the growth of magnetron sputter-deposited ZnO films was studied by alternating the deposition of a several-nanometer-thick ZnO layer and an O2/Ar mixed plasma exposure, i.e., a layer-by-layer (LbL) technique. Film crystallization was promoted by suppressing the formation of oxygen vacancies and interstitial defects by adjusting the exposure conditions of the O2/Ar plasma. These findings suggest that the chemical potential of oxygen atoms influences film crystallization and the electronic state. The diffusion and effusion of oxygen atoms at the growing surface have effects similar to those of thermal annealing, namely, the promotion of film crystallization and the creation and annihilation of oxygen- and zinc-related defects. The role of oxygen atoms reaching the growing film surface is discussed in terms of chemical annealing, and a possible oxygen diffusion mechanism is proposed.

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“…As presented in Figure S6, attempts to prepare a pure phase of LTWO at 3 GPa were unsuccessful according to the prediction as shown in Figures a,b and S2. Instead, a mixture of P 4 2 / mnm TiO 2 and orthorhombic Li 2 WO 4 phase, whose structure has not yet been solved or included in common database like ICSD and Material Project, was obtained. Considering whether LTWO may be formed or not at higher pressure requires taking orthorhombic Li 2 WO 4 into account.…”

Section: Resultsmentioning

confidence: 99%

Methodological Approach to the High-Pressure Synthesis of Nonmagnetic Li₂B⁴⁺B′⁶⁺O₆ Oxides

et al. 2021

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High-pressure solid-state synthesis advances boost discoveries of new materials and unusual phenomena but endures stringent recipe conditions, poor yield, and high cost. A methodological approach for accelerated and precisely high-pressure synthesis is therefore highly desired. Here, we take the exotic double-perovskite-related nonmagnetic Li2 B +4 B′+6O6 as an example to show the pipeline of data-mining, high-throughput calculations, experimental realization, and chemical interception of metastable phases. A total of 140 compounds in 7 polymorph categories were initially screened by the convex hull, which left ∼50% candidates in chemical space on the phase diagram of pressure-dependent polymorph evolution. Li2TiWO6 and Li2TiTeO6 were singled out for experimental testing according to the predicted map of crystal structure, function, and synthesis parameters. Computation on surface energy effect and interfacial chemical strain suggested that the as-made high-pressure R3-Li2TiTeO6 polymorph cannot be intercepted below a critical nanoscale but can be stabilized in heterojunction film on a selected compressive substrate at ambient pressure. The developed methodology is expected to accelerate the big-data-driven discovery of generic chemical formula-based new materials beyond perovskites by high-pressure synthesis and shed light on the large-scale stabilization of metastable phases under mild conditions.

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Phase transformations in Li2WO4 at high pressure

Cited by 16 publications

References 10 publications

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Chemical Activity of Oxygen Atoms in Magnetron Sputter-Deposited ZnO Films during Film Growth

Methodological Approach to the High-Pressure Synthesis of Nonmagnetic Li₂B⁴⁺B′⁶⁺O₆ Oxides

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Phase transformations in Li2WO4 at high pressure

Cited by 16 publications

References 10 publications

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li2WO4 Ceramic Tapes

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li2WO4 Ceramic Tapes

Chemical Activity of Oxygen Atoms in Magnetron Sputter-Deposited ZnO Films during Film Growth

Methodological Approach to the High-Pressure Synthesis of Nonmagnetic Li2B4+B′6+O6 Oxides

Contact Info

Product

Resources

About

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Environmental Friendly Approach for the Development of Ultra-Low-Firing Li₂WO₄ Ceramic Tapes

Methodological Approach to the High-Pressure Synthesis of Nonmagnetic Li₂B⁴⁺B′⁶⁺O₆ Oxides