High　purity　tetragonal　tungsten-bronze　type　K2Nb4O11　fine　powders　were　synthesized　via　an　economical　sal-gel　route　and　the　crystal　structure　was　solved　by　Rietveld　refinement　of　X-ray　powder　diffraction.　Structural　evolution　during　calcination　was　found　to　occur　via　translation　of　the　edge　shared　octahedra　into　a　corner　sharing　coordination.　Using　nano-structured　powder　as　precursor,　dense　K2Nb4O11　ceramics　were　successfully　fabricated　by　pressure-less　sintering.　This　maiden　achievement　allowed　for　primary　dielectric　characterization　of　this　ceramic　compound.　The　quantitative　analysis　based　on　empirical　parameters,　Delta　T-m　and　gamma,　reveals　a　relaxor　nature　in　the　temperature　region　below　200　K.　More　remarkably,　the　dielectric　constant　and　loss　are　almost　frequency　independent　in　the　wide　range　of　1　Hz-1　MHz　at　room　temperature　and　a　high　dielectric　constant　and　low　loss　(epsilon(r)　=　200　and　tan　delta　=　0.007)　makes　them　good　materials　for　dielectric　components　for　embedded　capacitors　and　multilayer　ceramic　capacitors.　(C)　2014　Elsevier　B.V.　All　rights　reserved.