Dielectric properties of Li3VO4 single crystals grown by the Czochralski method

Kim, Dong Jin; Jun, Byeong; Kim, Chung-Sik; Kim, Hyung Kook; Kim, Jung Nam; Hwang, Yoon‐Hwae

doi:10.1063/1.1530363

Cited by 10 publications

(9 citation statements)

References 9 publications

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“…The micro-Raman spectra of the pure and doped samples are reported in Figure . The main Raman peaks, due to vibrations of VO 4 tetrahedra, appear at ∼793 and ∼826 cm -1 , in very good agreement with previously reported Raman spectra of Li 3 VO 4 single crystals . In the lower-energy part of the spectra, magnified in Figure , well-defined Raman modes are observed for the pure sample at ∼338, 358, 379, 396, and 465 cm -1 .…”

Section: Resultssupporting

confidence: 89%

“…The main Raman peaks, due to vibrations of VO 4 tetrahedra, appear at ∼793 and ∼826 cm -1 , in very good agreement with previously reported Raman spectra of Li 3 VO 4 single crystals. 8 In the lowerenergy part of the spectra, magnified in Figure 6, well-defined Raman modes are observed for the pure sample at ∼338, 358, 379, 396, and 465 cm -1 . No Raman structures are present in the region 600-750 cm -1 , omitted in Figure 6 for sake of simplicity.…”

Section: Xrpdmentioning

confidence: 88%

“…More recently, the second harmonic generation (SHG) of Li 3 VO 4 has been studied, obtaining SHG coefficients comparable to those of LiNbO 3 , one of the most efficient frequency doubler materials. Moreover, the recent successful research on new routes for obtaining lithium vanadate single crystals , allowed a great development of these applications.…”

Section: Introductionmentioning

confidence: 99%

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Transport and Structural Properties of Pure and Cr Doped Li₃VO₄

et al. 2005

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This study deals with the effects of 5 and 10% chromium additions on the transport and structural properties of Li3VO4. The Cr substitution is easily obtained without impurity phases and does not affect the room- and high-temperature host crystal structure, as evidenced by X-ray powder diffraction and micro-Raman analysis. The EPR signals are interpreted in terms of quantified amounts of Cr ions in 5+ and 3+ valence states. Suitable 7Li and 51V MAS NMR spectra simulations agree with the EPR results about the relative amount of Cr5+ and Cr3+ ions substituted in V5+ and Li+ sites, respectively. The Cr3+ presence on Li site, also suggested by Raman results and Rietveld refinements, requires Li vacancies to maintain the charge neutrality. The p-type conductivity, suggested by the positive thermoelectric power coefficients, significantly increases by the cation doping up to an order of magnitude.

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Section: Resultssupporting

confidence: 89%

Section: Xrpdmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 99%

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Transport and Structural Properties of Pure and Cr Doped Li₃VO₄

et al. 2005

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“…[15] The peak at 327.1 cm À 1 is attributed to VO 4 tetrahedron bending, and other small peaks around 2004 50 cm À 1 are related to LiÀ O stretching motion. [16] All corresponding peaks are agreement well with the results reported in other Li 3 VO 4 -based materials. [17] However, for the LVO@C NW sample, no obvious Raman peaks of Li 3 VO 4 are observed.…”

Section: Resultssupporting

confidence: 89%

Deep Insight into Electrochemical Kinetics of Cowpea‐Like Li₃VO₄@C Nanowires as High‐Rate Anode Materials for Lithium‐Ion Batteries

et al. 2019

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Owing to the high theoretical capacity (394 mAh g−1) and appropriate lithiation voltage (0.5–1.0 V vs Li+/Li), Li3VO4 is highly regarded as an attractive anode candidate for high‐safety lithium‐ion batteries. However, its high‐rate performance is seriously restricted by the sluggish electrode kinetics. To address these problems, we synthesize cowpea‐like Li3VO4@C nanowires through a facile electrospinning method. In this well‐designed structure, Li3VO4 nanocrystals are uniformly encapsulated in conductive carbon nanofibers just like peas in their pods. The 1D morphology with high electronic conductivity can afford high Li+ ions diffusion rate and fast surface charge storage mechanism, leading to significantly enhanced electrochemical kinetics. Even after 1000 cycles at 2 A g−1, the reversible capacity of cowpea‐like Li3VO4@C nanowires can be maintained at 318.0 mAh g−1 without obvious capacity decay.

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“…Almost identical spectra collected from all the samples indicate that no impurity phases are present. 26,34,35 Fig. 1g shows the FTIR spectra of the samples and the assignment of these peaks are summarized in Table S2.…”

Section: Resultsmentioning

confidence: 99%