| abstract |
The ceramic powder comprises a mixture of pyrochlore phase and a secondary oxide, particularly 0.1-10 wt% of an oxide of hafnium or zirconium. The former pyrochlore phase has formula (I) and latter pyrochlore phase has formula (II). Sintering aids are also provided, which has 0.05 wt.% of silicon oxide, 0.1 wt.% of calcium oxide, 0.1 wt.% of magnesium oxide, 0.1 wt.% of ferric oxide, 0.1wt.% alumina and 0.08 wt.% of titanium oxide. The former pyrochlore phase has formula (I) i.e, AxByOz and latter pyrochlore phase has formula (II) i.e, A'>x'>B'>y'>Oz'> x, x'>,y and y'>2; z and z'>7; A and A'>Gd; and B and B'>Zr or Hf. Independent claims are included for: (1) a ceramic layer, which is made up of a ceramic powder; and (2) a layer system with a ceramic layer. |