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Comparative Study of Phases Forming in Niobium-Antimony Oxides System upon High Temperature Treatment and High-Energy Ball Milling

100%
Dulian P., Piz M., Filipek E., Wieczorek-Ciurowa K.
Acta Physica Polonica A
|
2014
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vol. 126
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issue 4
938-942
EN
The compound SbNbO_4 that is formed in a ternary system of Nb-Sb-O has been obtained for the first time by high-energy ball milling of the equimolar mixture of oxides Sb_2O_3/Nb_2O_5in argon atmosphere. This compound was characterised by X-ray diffraction, differential thermal analysis- thermal gravimetry, infrared, and scanning electron microscopy methods and its properties were compared with those of SbNbO_4 also obtained as a result of high-temperature reaction between the same oxides and also in argon atmosphere. As shown by differential thermal analysis results, irrespective of the method of synthesis, SbNbO_4 is stable in argon atmosphere up to ≈ 1125°C and in air up to ≈ 800°C. The compound can be applied as a photocatalyst in the reaction of producing hydrogen from water.
2
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Electrical Transport Properties of Yb_{8-x}Y_xV_2O₁₇ (x=0,2,8)

88%
Sawicki B., Piz M., Filipek E., Groń T., Duda H.
Acta Physica Polonica A
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2017
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vol. 132
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issue 2
363-366
EN
The UV-vis-NIR and electrical properties of Yb_{8-x}Y_xV_2O₁₇ for x=0, 2, and 8 were investigated. The band energy gap of 2.6 eV determined for Yb_6Y_2V_2O₁₇ (x=2) and comparable for the remaining compounds with x=0 and 8 is characteristic for insulators. Low electrical conductivity with a characteristic minimum shifting to higher temperatures from 322, via 360 to 370 K in the sequence x=0, 2 and 8, which decreases with increasing content of ytterbium was observed. Temperature dependence of thermoelectric power showed n-p transition at 410 and 467 K for x=0 and 2, respectively, and n-type conductivity for x=8, indicating mainly n-type electrical conductivity. A breakdown voltage of 26 V/mm is mainly observed for the I-V characteristics at 400 K and showing a varistor-like behavior.
3
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Electric Relaxation in Nb₆VSb₃O₂₅-Ceramics

88%
Groń T., Filipek E., Piz M., Kukuła Z., Pawlus S.
Acta Physica Polonica A
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2016
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vol. 129
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issue 3
355-358
EN
Broadband dielectric spectroscopy measurements of Nb₆VSb₃O₂₅ showed that in both the real (ε') and imaginary (ε'') components of permittivity there is visible relaxation process strongly obscured by dc conductivity. Application of the electric modulus representation of the data enables to study temperature evolution of this relaxation together with conductivity relaxation. It was showed that the activation energies for both processes are close. Low-frequency loss tangent increases strongly with temperature, suggesting that in the compound under study additional energy losses are associated with the conduction of electric current, as determined by the Joule-Lenz law.
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