Colossal dielectric constant and Maxwell-Wagner relaxation in   $Pb(Fe_{1/2}Nb_{1/2})O_{3-x}PbTiO_3$ single crystals
  Recently, materials exhibiting colossal dielectric constant ($CDC$) have attracted significant attention because of their high dielectric constant and potential applications in electronic devices, such as high dielectric capacitors, capacitor sensors, random access memories and so on. 
K.Liu, X.Y.Zhang