Development of Zirconia Based Oxygen Sensor for Lead and Lead-Bismuth Eutectic

Abstract

Nanocrystalline yttria stabilized zirconia (YSZ) solid electrolyte powders of composition ZrO2-5 mol% Y2O3 were prepared through modified Pechini process and were characterized. Sintered compacts of these powders in form of pellets had 96% of the theoretical density and helium leak rate <10-9 S cc /s. Using a pellet of this electrolyte in a galvanic cell with different oxygen partial pressures across it, emf was measured as a function of temperature and thus qualified for sensor application. Towards the fabrication of the oxygen sensor for Pb and LBE loop, a compact design wherein a YSZ pellet, glass soldered to a metallic component had been chosen for the oxygen meter.

Energetics of lanthanide cobalt perovskites: LnCoO3−δ (Ln = La, Nd, Sm, Gd)

“…[15][16][17] The Gibbs free energies and enthalpies of formation of multicomponent transition metal oxides were obtained using solid electrolyte based galvanic cell methods and calorimetric techniques. [18][19][20][21][22][23][24][25] The stability of lanthanide cobaltite perovskites was also determined by thermogravimetry by considering the decomposition reaction, LnCoO 3 / Ln 2 O 3 + CoO + 1/2O 2 (g) in a reducing atmosphere. 14 Recent studies on oxygen decient lanthanide cobaltites, LnCoO 3Àd (LaCoO 2.992 , NdCoO 2.985 , SmCoO 2.982 and GdCoO 2.968 ), suggest that their conductivity in the semiconducting state and activation energy for the transition to metallic conduction decrease monotonically with increasing ionic radius of the Ln cation.…”

Facile fabrication and characterisation of MoO3coated nanocrystalline ZrO2by polymeric resin route

“…[1][2][3] ZrO 2 has found many industrial applications in diversified fields including catalysis, restorative dentistry, high temperature ceramics, nanocomposite polymers, microelectronics and sensors. [4][5][6][7][8][9] In order to meet the requirements for these applications, nanostructured ZrO 2 has been synthesised in many forms like thin films, powders and sintered structures. 8,10 In addition, ZrO 2 also coupled with other components such as metals, [11][12][13] metal oxides [14][15][16] and metal chalcogenides 17,18 as solid solutions or composite structures.…”

“…Nanocrystalline ZrO 2 has been widely investigated for its scientific and technological potential, which is highly influenced by its structure dependent physicochemical properties such as high melting point, low thermal conductivity, high corrosion resistants, etc 1–3. ZrO 2 has found many industrial applications in diversified fields including catalysis, restorative dentistry, high temperature ceramics, nanocomposite polymers, microelectronics and sensors 4–9. In order to meet the requirements for these applications, nanostructured ZrO 2 has been synthesised in many forms like thin films, powders and sintered structures 8.…”