Preparation of Li3-x H x TaO4 by means of hydrothermal synthesis and protolysis

Kumada, Nobuhiro; Ozawa, Nobuo; Kinomura, Nobukazu; Muto, Fumio

doi:10.1007/bf01106519

Cited by 4 publications

(5 citation statements)

References 12 publications

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“…We never observe the formation of LiNbO 3 in our aqueous syntheses. The only other hydrothermal or solvothermal synthesis of the trilithiate phase, Li 3 MO 4 , was reported by Kumada et al for the hydrothermal synthesis of lithium tantalates . They used what might be described as tantalic acid or a hydrous precipitate of tantalum oxide, along with LiOH for reactants.…”

Section: Resultsmentioning

confidence: 99%

“…The only other hydrothermal or solvothermal synthesis of the trilithiate phase, Li 3 MO 4 , was reported by Kumada et al for the hydrothermal synthesis of lithium tantalates. 26 They used what might be described as tantalic acid or a hydrous precipitate of tantalum oxide, along with LiOH for reactants. They also observed the rock-salt phase at higher LiOH concentration but with a Li/Ta ratio of only 0.22, very broad diffraction peaks, and a formula described as Li 3-x H x TaO 4 .…”

Section: Aqueous Synthesis Of Lithium Niobates and Tantalatesmentioning

confidence: 99%

“…24 Finally, the ordered monoclinic Li 3 TaO 4 3 has only been synthesized by solid-state methods or annealing precursor powders. 3,25 However, hydrothermal synthesis of disordered rock-salt type Li 3-x H x TaO 4 has been reported, 26 with a Li/Ta ratio of 1.2.…”

Section: Introductionmentioning

confidence: 99%

“…Both nanoparticles and thin films of LiTaO 3 were formed from a H 2 O 2 -modified sol−gel precursor, after annealing at 700 °C . Finally, the ordered monoclinic Li 3 TaO 4 3 has only been synthesized by solid-state methods or annealing precursor powders. , However, hydrothermal synthesis of disordered rock-salt type Li 3− x H x TaO 4 has been reported, with a Li/Ta ratio of 1.2.…”

Section: Introductionmentioning

confidence: 99%

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Comparison of Aqueous and Non-aqueous Soft-Chemical Syntheses of Lithium Niobate and Lithium Tantalate Powders

Nyman

Anderson

Provencio

2008

Crystal Growth & Design

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Lithium niobates and tantalates have a number of characteristics exploitable for optical and electrical devices that include ion conductivity, self-activating or dopant luminescence, piezoelectricity, pyroelectricity and ferroelectricity. To form these materials as nanometric powders or thin-film coatings, soft-chemical processing is required, and a limited number of procedures have been reported. We have explored two soft-chemical routes to lithium niobate and lithium tantalate materials: a non-aqueous procedure and an aqueous procedure. The non-aqueous procedure, which utilizes 1,4-butanediol and simple chemical precursors produces pure phase rhombohedral LiTaO3 and LiNbO3. For aqueous synthesis, we utilize the single-source polyoxoniobate salt: Li8[M6O19]·xH2O (M = Nb, Ta) in a hydrothermal reaction. If LiOH is added, the product is rock-salt type Li3MO4. Without LiOH, other phases are observed. The products are characterized by powder X-ray diffraction, scanning electron microscopy, transmission electron microscopy, compositional analysis, and thermogravimetry, and the two soft-chemical processes are compared.

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Section: Resultsmentioning

confidence: 99%

Section: Aqueous Synthesis Of Lithium Niobates and Tantalatesmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Comparison of Aqueous and Non-aqueous Soft-Chemical Syntheses of Lithium Niobate and Lithium Tantalate Powders

Nyman

Anderson

Provencio

2008

Crystal Growth & Design

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“…Current studies on Li 3 TaO 4 mainly include its crystal structure , and fabrication. − Considering its potential application as a blanket material, the tritium-diffusion behavior in the Li 3 TaO 4 crystal is essential and important to understand the tritium-release process. Besides, the tritium-release behavior is affected by various irradiation-induced defects, especially the lithium vacancy, because lithium atoms are constantly knocked out of their positions to generate tritium under irradiation.…”

Section: Introductionmentioning

confidence: 99%

First-Principles Study of Tritium Diffusion in the Li₃TaO₄ Crystal

Yang

et al. 2019

ACS Omega

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Li3TaO4 with a high melting point, good thermal stability, and higher lithium content has become a possible choice for breeder materials, which have potential applications in future fusion reactors. Perfect and defect crystal models of Li3TaO4 are set up, and all of the tritium-diffusion pathways have been studied by the first-principles method. The activation energy barriers of different diffusion pathways are calculated and analyzed considering the pathway length and tritium–oxygen interactions. The obtained minimum energy barrier for tritium diffusing in the perfect Li3TaO4 crystal is only 0.34 eV. The minimum energy barrier is less than 0.72 eV when tritium diffuses in the defect Li3TaO4 crystal in the presence of a lithium vacancy. Finally, the diffusion coefficients of tritium in the Li3TaO4 crystal are calculated, which further confirm that it is easy for tritium to escape from the trap of the lithium vacancy and diffuse in the crystal. Such a tritium-diffusion behavior is in favor of the tritium-release process of the Li3TaO4 crystal and could provide theoretical guidance for the future applications of Li3TaO4 materials.

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