Czechoslovak Journal of Physics B

, Volume 28, Issue 4, pp 414–433 | Cite as

Some physical properties of calcia and yttria stabilized ThO2 ceramics

  • M. Hartmanová
  • F. Hanic
  • A. Koller
  • J. Janči
Article
Received:

Abstract

In this paper the density, electrical conductivity, and dielectric permittivity of vacant ceramics of Ca x Th1−xO2−x and Y x Th1−xO2−x/2 type, respectivelly, were investigated as functions of temperature, frequency, and composition of these systems.

The densityϱ drops with increasing calcium or yttrium amount, respectively. In the ThO2-CaO system this is in agreement with the mechanism of formation of vacant phase Ca x Th1−x O2x. The decrease of porosity in the ThO2-Y2O3 system with increasing yttrium content can be due various factors which influence the mobility of Y3+ ions and, thus, also the formation of pores.

The investigation of transport numbers has shown that whilst the Ca x Th1−xO2−x phase under our experimental conditions is essentially p-type conductor, the Y x Th1−xO2−x/2 phase is essentially ionic conductor.

The transport of ion carriers is a diffusion-like process which has activation energy 1·28 to 1·16eV in the Ca x Th1−xO2−x phase and 1·28 to 1·06 in the Y x Th1−xO2−x/2 phase, respectively. The association of impurity ions with anion vacancies provides the maxima in conductivity isotherms.

The relative dielectric permittivity ɛ′ of the vacant phase Ca x Th1−xO2−x ranges from 19·2 to 36·2, in the phase Y x Th1−xO2−x/2 from 19·2 to 103, depending on temperature, frequency, and composition of these systems.

Keywords

Calcia Porosity Activation Energy Electrical Conductivity Yttrium 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.
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Copyright information

© Academia, Publishing House of the Czechoslovak Academy of Sciences 1978

Authors and Affiliations

  • M. Hartmanová
    • 1
  • F. Hanic
    • 2
  • A. Koller
    • 3
  • J. Janči
    • 4
  1. 1.Institute of PhysicsSlovak Acad. Sci.BratislavaCzechoslovakia
  2. 2.Institute of Inorganic ChemistrySlovak Acad. Sci.Bratislava
  3. 3.Research Institute of Electrotechnic CeramicsHradec Králové
  4. 4.Geophysics National EnterpriseBratislava

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