Defect Structure and Electrical Conductivity of ThO2-Y2O3 Solid Solutions

Subbarao, E. C.; Sutter, P. H.; Hrizo, J.

doi:10.1111/j.1151-2916.1965.tb14794.x

Cited by 124 publications

(30 citation statements)

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“…Such materials produce one oxygen vacancy per added impurity atom due to the charge neutrality condition. It has been reported that the variation of lattice parameter with composition can be accounted for by the relative size of the ions [26]. In case of compound like Pu(C,O), when carbon atom is replaced by oxygen atom of smaller size, the lattice parameter of Pu(C,O) has been found decreasing [27].…”

Section: Dilatometrymentioning

confidence: 98%

Development of a master sintering curve for ThO2

Kutty

Khan

Hegde

et al. 2004

Journal of Nuclear Materials

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Section: Dilatometrymentioning

confidence: 98%

Development of a master sintering curve for ThO2

Kutty

Khan

Hegde

et al. 2004

Journal of Nuclear Materials

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“…Due to radioactivity and costs, thoria or hafnia-based electrolytes are rather rarely applied in steel industry [104,105].…”

Section: Cazro 3 -Based Electrolytes For Oxygen Electrochemical Probesmentioning

confidence: 99%

Composite Oxide Electrolytes for Electrochemical Devices

Dudek¹

2008

Advances in Materials Sciences

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This work is focused on the comparative analysis of electrical, electrochemical and mechanical properties of composite ceramic oxide electrolytes, providing a brief overview of the materials having better performance than monophase ones in various high temperature electrochemical devices such as: solid oxide fuel cells, sensors for automotive industry, oxygen probes for controlling metal processing. Introduction of Al 2 O 3 inclusions into cubic yttria -zirconia solid solution (8YSZ) matrix, caused the improvement of electrical and mechanical properties compared to pure 8YSZ. The Nd 2 Ti 2 O 7 secondary phase was also able to coexist with 8YSZ matrix and the fracture toughness K Ic of 8YSZ ceramics was also significantly improved by Nd 2 Ti 2 O 7 addition.Heterophase oxide ionic conductors in the system Calcium zirconate -cubic calcia zirconia solid electrolytes seem to be promising solid electrolytes for application in electrochemical probes for controlling oxygen dissolved in molten steel. The ionic conduction limit for electrolytes based on CaZrO 3 is lower than that for calcia -stabilized zirconia (13CSZ). Hence CaZrO 3 -based materials perform better at low oxygen concentration at molten alloys.On the other hand composite layered ceramics involving Ce 0.8 Sm 0.2 O 2 /Bi 0.8 Eb 0.2 O 2 or Ce 0.9 Gd 0.1 O 2 /BaCe 0.8 Y 0.2 O 3 /Ce 0.9 Gd 0.1 O 1.95 system exhibited better electrolytic stability in gas atmospheres with low oxygen partial pressure at the temperatures 600-800 o C. These materials are successfully tested as electrolytes in solid oxide fuel cells. The gradient ceramic oxide electrolytes seems to overcome the limitation of applying them as solid electrolytes in solid oxide fuel cells for long time performance.

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“…Also from a more fundamental point of view, the Th 1Àx RE x O 2Àx/2 systems are intriguing because a large amount of defects in the form of oxygen vacancies are formed to compensate for the substitution of Th 4+ cations by RE 3+ cations, especially at high REE concentrations [16]. In a different context, ThO 2 doped with REOs are also studied because of the high anion (O 2À ) conductivity of these materials induced by the presence of oxygen vacancies [17][18][19]. Therefore, these materials could be used as solid electrolytes in e.g.…”

Section: Introductionmentioning

confidence: 98%