Conductivity investigation of Ca V2O6

Belyaninov, Yu. N.; Grunin, V. S.; Zonn, Z.N.; Ioffe, V. A.; Patrina, I. B.; Yanchevskaya, I.S.

doi:10.1002/pssa.2210270120

Cited by 7 publications

(1 citation statement)

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“…According to CaO-V 2 O 5 phase diagram, the melting point of CaV 2 O 6 is about 775°C [8]. Its structure, conductivity and catalytic properties have been reported [9][10][11][12]. The CaV 2 O 6 nanoribbons has been prepared via hydrothermal methods [13].…”

Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of CaV2O6 ceramics with low dielectric loss

Yao

Chen

et al. 2015

J Mater Sci: Mater Electron

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Novel glass-free low temperature firing microwave dielectric ceramics CaV 2 O 6 with high Q was prepared through a conventional solid-state reaction method. The crystal phase and microstructures were studied by XRD and SEM. Orientation degree of CaV 2 O 6 ceramics increased with an increase of sintering temperature. The Qxf values of CaV 2 O 6 ceramics were strongly correlated with the densification and orientation degree. Typically, the CaV 2 O 6 ceramics sintered at 675°C possessed excellent microwave dielectric properties: e r = 10.2, Qxf = 123,000 GHz (at 10.2 GHz) and s f = -60 ppm/°C.

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Section: Introductionmentioning

confidence: 99%

Microwave dielectric properties of CaV2O6 ceramics with low dielectric loss

Yao

Chen

et al. 2015

J Mater Sci: Mater Electron

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Temperature Dependence of the EPR Spectra of Cr³⁺ and Cr⁵⁺ Ions in CaV₂O₆ and BaV₂O₆ Crystals

Grunin

Patrina

Zonn

1980

Physica Status Solidi (b)

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V. S. GRUNIN et al.: Temperature Dependence of the EPR Spectra of Cr3+ and Cr5+ 765 phys. stat. sol. (b) 98, 765 (1980) An investigation is made of EPR spectra of CaV,O, and BaV20, single crystals doped with chromium. It is found that the point symmetry of the paramagnetic Cr3+ and C P ions depends on temperature. It follows from t,he symmetry of the Cr5+ spectrum in BaV,O, and its superhyperfine structure a t T = 77 K that the Cr5+ ion is displaced to one of two neighbouring V atoms. The observed change of the impurity ion symmetry cannot be explained both by the off-centre ion theory and the Jahn-Teller effect. HCCJIeEOBaHbI CneKTpbI 3nP MOHOKpUCTaJIJIOB CaV,O, U BaV,O, C EpUMeCbIO XpOMa. 3KCEepUMeHT nOKa3aJI, 9 T O TOge9HaH CUMMeTpUX IlapaMarHUTHbIX IlOHOB Cr3r U Cr6+ MeHHeTCH C TeMIlepaTypO6. H3 CHMMeTPUH CneKTpa UOHOB Cr5' B BaV,O, U ero CylIep-CBepXTOHHOfi CTpYKTYPbI npU T = 77 K CJleEyeT, ' XTO 3TOT MOH CMeUeH K OAHOMY M3 EByX COCeHHUX aTOMOB BaHaEUH. H~~J I K I @~M O~ kl3MeHeHHe CMMMeTpUK npUMeCHbIX UOHOB He MOIHeT 6bITb 06' bHCHeHO B PaMKaX MOAenU HeUeHTpanbHOCTU UJIU 3@@eKTa HHa-Tennepa.s = 112, g, = 1.983 k 0.001, A , = (2.24 & 0.02) X J , A, = (1.67 +_ 0.02) X J , A , = (0.4 & 0.2) x J , A; = (1.21 & 0.02) x J , A , = (7.04 k 0.02) X lopz6 J, J . g, = 1.901 & 0.001 . A; = (9.92 5 0.02) X The 2 and z axes of gand A-tensors for two non-equivalent centres are in the (001) plane and form the angles k0.262 rad with the [010] and [loo] axes, respectively, the y-axis being the corninon one and coincides with the [OOl] axis of crystal. The 2' and z' axes of the SHFS form the angle +0.350 rad with the z and z axes, 9' ) I [OOl] is common. 2.2 Temperuture dependence of the spectra 2.2.1 Cr3+ When the temperature was decreased below about 270 K every line of the Cr3+ ion spectrum in CaV,O, was doubled. The distance of the pairs increases when lowering temperature to about 200 I< and is constant for further decrease of temperature.

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