Effect of Ca substitution on microwave dielectric properties of BaV2O6 ceramics

Yao, Guoguang; Z, Ren; Liu, Peng

doi:10.1007/s10832-018-0113-6

Cited by 9 publications

(7 citation statements)

References 30 publications

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“…6. The observed Raman bands and their assignments (according to Baran et al , 1987; Yao et al , 2018) for medvedevite KMn 2+ V 5+ 2 O 6 Cl⋅2H 2 O are given in the Table 6. The bands around 475 cm –1 and 837 cm –1 were assigned to symmetric and antisymmetric stretching vibrations V–O–V, respectively.…”

Section: Raman Spectroscopymentioning

confidence: 99%

Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Shablinskii

Avdontceva

Vergasova

et al. 2022

MinMag

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Medvedevite, KMn2+V5+2O6Cl⋅2H2O, is a new mineral discovered in the Toludskoe lava field, formed during the 2012–2013 Tolbachik fissure eruption. The mineral occurs as thin acicular transparent bright red crystals up to 0.15 mm. Medvedevite is associated with thénardite, halite, aphthitalite, leonite, kieserite, eugsterite and syngenite. The empirical formula calculated on the basis of 13+ positive charge units for the anhydrous part and 2H2O is (K1.02Na0.03)Σ1.05Mn2+0.95(V5+1.92S6+0.05Si0.04)Σ2.01O6.02Cl0.96⋅2H2O. The crystal structure of medvedevite was determined using single-crystal X-ray diffraction data: monoclinic crystal system, the space group is P21/c, a = 7.1863(2), b = 10.1147(3), c = 12.7252(4) Å, β = 106.243(3)°, V = 888.04(5) Å3, Z = 4 and R1 = 0.029. The concept of ‘structural unit’ and ‘interstitial complex’ could be applied to the crystal structure of medvedevite. The structural units in medvedevite are based on the high bond-valence V5+O5 polyhedra which share edges and link into [V2O6] chains elongated along the a axis. The interstitial complexes consist of Mn2+, K+ cations and H2O groups and occupy the interstices between structural units. The mineral is optically biaxial (+), with α =1.782(2), β = 1.786(2), γ = 1.792(2), 2V(calc) = 41° (λ = 589 nm). The seven strongest lines of the powder XRD pattern are [d, Å (I, %) (hkl)]: 7.79(100)(011); 5.70(11)(110); 4.75(14)(11 $\bar{2}$ ); 3.89(29)(022); 3.25(53)(031); 2.958(79)(21 $\bar{3}$ ); and 2.850(33)(220). The mineral has been named in honour of the Russian geologist and chemist Robert Alexandrovich Medvedev (1939–2005).

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Section: Raman Spectroscopymentioning

confidence: 99%

Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Shablinskii

Avdontceva

Vergasova

et al. 2022

MinMag

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“…in CaV 2 O 6 versus Ti 4+ and Al 3+ in CTLA satisfy the conditions of ion substitution and forming a solid solution [21][22][23], hence, in this study, we chose CaV 2 O 6 as a sintering aid for CTLA ceramics and studied its effects on the sintering behavior, crystal structure and microwave dielectric performance.…”

Section: Previous Researches Have Revealed That Znomentioning

confidence: 99%

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

Chen

Yang

Guo

et al. 2021

Preprint

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The 0.61CaTiO3-0.39LaAlO3 (CTLA) ceramics are widely used in relay station, aerospace and radar systems for their superior properties: remarkable quality factor and excellent thermal stability. However, some deficiencies remain, such as low permittivity and excessively high sintering temperature, which limit their development in microwave communication. Herein, we introduce CaV2O6 to the CTLA ceramics to solve these problems and systematically investigate its effects on sintering temperature, phase constitution, microstructure and microwave dielectric properties. The CTLA ceramics added with 0–2.0 wt% CaV2O6 were prepared by the traditional solid-state reaction procedure. The XRD patterns indicated that the pure phase Ca0.61La0.39Al0.39Ti0.61O3 (PDF #52-1773) was obtained from all samples, which revealed that the CaV2O6 was dissolved into CTLA lattice to form a solid solution. As the CaV2O6 content increased, the strongest X-ray diffraction peaks gradually shifted toward low angles, which manifested the increase of cell volume of the solid solution. When the additive amount was 1.0 wt%, the CaV2O6 could high-effectively lower the sintering temperature from 1450 ℃ to 1290 ℃ and obviously promote the growth of grains. Meanwhile, the εr slightly increased, the Q×f significantly improved and the τf favorably decreased to closer to zero, then the prominent microwave dielectric performance was exhibited, with εr = 40.6, Q×f = 48,800 GHz (at 4.5 GHz), and τf = 0.78 ppm/℃. Such CTLA ceramics are expected to promote the development of high-performance and temperature-stable microwave components.

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“…In ULTCC materials, the ceramics are co‐fired with aluminium electrode which has the melting point of 660 °C. Only a few ceramic systems based on tellurium,, molybdenum and vanadium with good dielectric properties are reported in literature for ULTCC applications. In the present work, phase pure and ultra low temperature sinterable Ba 3 Mg(V 2 O 7 ) 2 (BMV) and Ba 3 Zn(V 2 O 7 ) 2 (BZV) ceramics have been prepared through solid state ceramic route.…”

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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Effect of Ca substitution on microwave dielectric properties of BaV2O6 ceramics

Cited by 9 publications

References 30 publications

Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

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

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Effect of Ca substitution on microwave dielectric properties of BaV2O6 ceramics

Cited by 9 publications

References 30 publications

Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Medvedevite, KMn2+V5+2O6Cl⋅2H2O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

CaV2O6: A highly effective sintering aid for 0.61CaTiO3-0.39LaAlO3 ceramics

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

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Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

Medvedevite, KMn²⁺V⁵⁺₂O₆Cl⋅2H₂O, a new fumarolic mineral from the Tolbachik fissure eruption 2012–2013, Kamchatka Peninsula, Russia

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