Glass-like thermal conductivity in SrTiO3 thermoelectrics induced by   A-site vacancies
  The introduction of A-site vacancies in SrTiO3 results in a glass-like thermal conductivity while Nb substituted samples maintains good electrical conductivity. This unexpected result brings SrTiO3 one step closer to being a high-performing phonon-glass electron-crystal thermoelectric material. 
S. R. Popuri, A. J. M. Scott, R. A. Downie, M. A. Hall, E. Suard, R.   Decourt, M. Pollet, and J.-W. G. Bos
cond-mat.mtrl-sci