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Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)_{4}(V,Zr)_{2}O_{11-z} Ceramics

100%

Politova E., Torba J., Fortalnova E., Kaleva G., Safronenko M., Venskovskii N.

Acta Physica Polonica A

2010

vol. 117

issue 1

20-23

Ceramic solid solutions (Bi_{1-y}La_{y})_{4}(V_{1-x}Zr_{x})_{2}O_{11-z} with x = 0-0.05, y = 0-0.16 have been prepared by the solid state reaction method. The samples were studied by differential thermal analysis, X-ray diffraction, dielectric spectroscopy, and impedance methods. The concentration and temperature stabilization regions of the polymorphous α-, β-, γ'-, γ-modifications have been determined. The effects observed in dielectric properties, conductivity, and impedance data confirmed the influence both of intrinsic oxygen vacancies and those "pinned" at ferroelectric domain boundaries on the temperature hysteresis of α-β phase transition and their contribution to mechanism of oxygen ion transport.

Electroconductive and Dielectric Properties of Composites Based on Bismuth Vanadate

100%

Torba J., Golubko N., Fortalnova E., Kaleva G., Safronenko M., Venskovskii N., Politova E.

Acta Physica Polonica A

2010

vol. 117

issue 1

24-26

Ceramic composites (100 - n)Bi_{4}V_{2}O_{11-z}-nCe_{0.9}Gd_{0.1}O_{1.9} with n=0÷25 wt% were prepared and studied by the X-ray diffraction, dielectric spectroscopy, and impedance methods. Slight increase in the unit cell volume accompanied by monotonous decrease in temperatures and broadening of the α-β and β-γ phase transitions with increasing fluorite content was observed in the composites studied. Increase in melting temperatures of composites with n ≥ 10 with the retention of their high ionic conductivity was also proved.

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2 Acta Physica Polonica A

2 2010

2 Fortalnova E.

2 Kaleva G.

2 Politova E.

2 Safronenko M.

2 Torba J.

2 Venskovskii N.

1 Golubko N.

Search results

Phase Transitions and Transport Properties of the Bismuth Vanadate-Based (Bi,La)_{4}(V,Zr)_{2}O_{11-z} Ceramics

Electroconductive and Dielectric Properties of Composites Based on Bismuth Vanadate