| http://www.w3.org/ns/prov#value | - (VII) A pyrochlore structure material of the general formula Mb2Mb???(2???k)Mb???kO7 wherein Mb is Ga, or Gd, a rare earth element such as La, Y, or Sm, Mb??? is Zr, a transition metal element such as Mo, Ti, Fe, an alkaline earth element such as Ca, Sr, Ba or Mg, wherein 0<k<0.5, and wherein Mb??? is a transition metal element different from Mb???, such as Mo, Ti, Zr, or Fe;
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