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At this point in time, material design projects arise from qualitative ideas which are inpired in the chemistry of existing compounds. [ Should we say that in the future machine learning might give even more radical points of departure ? ].  $Ba_{1-x} K_x B iO_3$, is a famous high temperature superconductor, discovered in the later 80's. [ REF SLEITHGT AND CAVA]. Its parent compound,   BaBiO3, has a distorted  perovskite structure, with a gap of the order of   0.7 eV band gap  (Sleight et. al (1975))