Crystal structure and microwave dielectric properties of new alkaline earth vanadate A 4 V 2 O 9 (A = Ba, Sr, Ca, Mg and Zn) ceramics for LTCC applications

Unnimaya, A. N.; Suresh, E. K.; Ratheesh, R.

doi:10.1016/j.materresbull.2016.12.026

Cited by 42 publications

(17 citation statements)

References 27 publications

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“…Bands in the lower frequency region of 100–290 cm –1 are assigned to lattice mode vibrations. In the range of 346–852 cm –1 , bands are attributed to the VO 4 3– tetrahedron. At 346 and 363 cm –1 , bands are assigned to O–V–O symmetric bending vibrations. At 395 cm –1 the band corresponds to bending vibrations.…”

Section: Resultsmentioning

confidence: 96%

Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

et al. 2020

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White light photoluminescent materials can overcome many problems due to an intrinsic color balance, in addition to reducing the cost for application in emitting components and electronic devices. In this sense, to observe this phenomenon of photoluminescence, variations in the synthesis time at low temperatures were carried out, which also influenced the degree of structural order/disorder of strontium vanadate (Sr 10 V 6 O 25 , SVO). The microwave-assisted hydrothermal route allowed us to evaluate the structural and morphological evolution of the SVO compound. Furthermore, this paper discusses how van der Waals forces influence the morphological evolution of a semiconductor as a function of orientation, induction, and dispersion interactions. The experimental study combined with theoretical approaches provided information about the structure and electronic properties of SVO. From the experimental data and theoretical analysis, we propose, for the first time, that the unit cell of the SVO structure is composed of three distorted [SrO x ] (x = 6, 7, and 9) and two distorted [VO 4 ] clusters. Photoluminescence measurements revealed an efficient broadband emission, and the conversion of ultraviolet light excitation into visible light was observed. The emission chromaticity showed that the structural disorders of the [SrO x ] and [VO 4 ] clusters present the possibility of change in the Commission Internationale de l'E ́clairage emission color.

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Section: Resultsmentioning

confidence: 96%

Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

et al. 2020

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“…We thus conclude that the presence of four nonequivalent vanadium sites within the unit cell is responsible for the splitting of the internal [VO 4 ] 3– modes. The Raman peaks at 462 and 370 cm –1 are assigned to asymmetric bending modes, whereas the band at 285 cm –1 is contributed by the symmetric bending mode . Moreover, peaks corresponding to the lattice vibrational modes appear at the low-wavenumber region (80–250 cm –1 ) …”

Section: Results and Discussionmentioning

confidence: 99%

“…The Raman spectrum of the synthesized Zn 4 V 2 O 9 is shown in Figure . With vanadium metal being exclusively in a tetrahedral geometry, the observed Raman bands are assigned to vibrational modes based on the free vanadate unit [VO 4 ] 3– . Although the reduced symmetry of the vanadate tetrahedra in Zn 4 V 2 O 9 removes degenerate vibrational modes, all other modes are still Raman-active .…”

Section: Results and Discussionmentioning

confidence: 99%

“…With vanadium metal being exclusively in a tetrahedral geometry, the observed Raman bands are assigned to vibrational modes based on the free vanadate unit [VO 4 ] 3– . Although the reduced symmetry of the vanadate tetrahedra in Zn 4 V 2 O 9 removes degenerate vibrational modes, all other modes are still Raman-active . The origin of peaks in the high-wavenumber region (800–1000 cm –1 ) was reported to be the symmetric stretching mode of [VO 4 ] 3– .…”

Section: Results and Discussionmentioning

confidence: 99%

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The Deep Eutectic Solvent Precipitation Synthesis of Metastable Zn₄V₂O₉

et al. 2021

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A precipitation method involving a deep eutectic solvent (DES)a mixture of hydrogen bond donor and acceptoris used to synthesize a ternary metal oxide. Without toxic reagents, precipitates consisting of Zn3(OH)2V2O7·nH2O and Zn5(OH)6(CO3)2 are obtained by simply introducing deionized H2O to the DES solution containing dissolved ZnO and V2O5. Manipulation of the synthetic conditions demonstrates high tunability in the size/morphology of the two-dimensional nanosheets precipitated during the dynamic equilibrium process. According to differential scanning calorimetry and high-temperature powder X-ray diffraction, Zn3V2O8 and ZnO obtained by the annealing of the precipitate are intermediates in the reaction pathway toward metastable Zn4V2O9. Intimate mixing of the metal precursors achieved by the precipitation method allows access to the metastable zinc-rich vanadate with unusually rapid heat treatment. The UV–vis and surface photovoltage spectra reveal the presence of sub-band gap states, stemming from the reduced vanadium (V4+) center. Photoelectrochemical measurements confirm weak photoanodic currents for water and methanol oxidation. For the first time, this work shows the synthesis of a metastable oxide with the DES-precipitation route and provides insight into the structure–property relationship of the zinc-rich vanadate.

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“…There is a renewed interest in vanadium‐based materials owing to their low sintering temperature, good stability, compatibility with metal electrodes etc. Several vanadium based ceramic systems were reported for LTCC applications, such as Ca 5 Co 4 (VO 4 ) 6 , Ba 16 V 18 O 61 , BaTa 2 V 2 O 11 , LiCa 3 ZnV 3 O 12 , LiMgVO 4 , BiVO 4 , 0.45BiVO 4 ‐0.55TiO 2 , Ba 3 (Ti,Zr)V 4 O 15 , Ca 5 Mn 4 (VO 4 ) 6 , Mg 4 V 2 O 9 , BaMg 2 V 2 O 8 etc., . X Jiang et al reported that orthorhombic BaCaV 2 O 7 ceramic sintered at 830 °C shows good microwave dielectric properties with dielectric constant of 8.9, quality factor of 31,362 GHz and temperature coefficient of resonant frequency of –68.2 ppm/°C .…”

Section: Introductionmentioning

confidence: 99%

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications

et al. 2019

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Single phase Ba3A(V2O7)2 (A = Mg, Zn) ceramics were prepared through a conventional solid‐state ceramic route. The structural and microwave dielectric properties of Ba3A(V2O7)2 (A = Mg, Zn) compositions have been investigated. Powder X‐ray diffraction and Raman spectroscopic studies have been carried out to confirm the phase purity and crystal structure of prepared Ba3A(V2O7)2 (A = Mg, Zn) compositions. Scanning electron microscopic images for Ba3A(V2O7)2 (A = Mg, Zn) ceramics exhibit a homogeneous and dense microstructure. The microwave dielectric properties of the samples were studied using Hakki–Coleman post resonator and cavity perturbation methods. Ba3Mg(V2O7)2 ceramic has a dielectric constant (εr) of 10.3, quality factor (Q x f ) of 43400 GHz and temperature coefficient of resonant frequency (τf) of –46.87 ppm/°C at 660 °C for 1 h. Ba3Zn(V2O7)2 shows a dielectric constant of 10.8, quality factor of 46400 GHz and temperature coefficient of resonant frequency of –78.1 ppm/°C at 660 °C for 1 h. Ba3A(V2O7)2 (A = Mg, Zn) ceramics show excellent chemical compatibility with Al metal electrodes.

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Crystal structure and microwave dielectric properties of new alkaline earth vanadate A 4 V 2 O 9 (A = Ba, Sr, Ca, Mg and Zn) ceramics for LTCC applications

Cited by 42 publications

References 27 publications

Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

The Deep Eutectic Solvent Precipitation Synthesis of Metastable Zn₄V₂O₉

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications

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Crystal structure and microwave dielectric properties of new alkaline earth vanadate A 4 V 2 O 9 (A = Ba, Sr, Ca, Mg and Zn) ceramics for LTCC applications

Cited by 42 publications

References 27 publications

Unraveling the Photoluminescence Properties of the Sr10V6O25 Structure through Experimental and Theoretical Analyses

Unraveling the Photoluminescence Properties of the Sr10V6O25 Structure through Experimental and Theoretical Analyses

The Deep Eutectic Solvent Precipitation Synthesis of Metastable Zn4V2O9

Preparation and Microwave Dielectric Properties of Ba3A(V2O7)2 (A = Mg, Zn) Ceramics for ULTCC Applications

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Product

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Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

Unraveling the Photoluminescence Properties of the Sr₁₀V₆O₂₅ Structure through Experimental and Theoretical Analyses

The Deep Eutectic Solvent Precipitation Synthesis of Metastable Zn₄V₂O₉

Preparation and Microwave Dielectric Properties of Ba₃A(V₂O₇)₂ (A = Mg, Zn) Ceramics for ULTCC Applications