Transparent　and　pale　yellow　calcium　barium　niobaLes　(CaxBa1-xNb2O5),　single　crystals　with　larger　Ca　content　ranging　from　0224　to　0.366　have　been　grown　our　by　floating　zone　technique.　The　growth　of　CBN　crystals　in　air　is　oriented　along　the　＜　001　＞　direction.　The　CBN　crystals　have　been　characterized　by　X-ray　diffraction　and　X-ray　single　crystal　diffraction.　The　composition　uniformity　of　CBN-35　crystal　rod　has　been　checked　by　EPMA　measurement.　The　deviations　of　Ca　mole　fraction　between　initial　melt　and　the　crystal　are　0.1-1A　mol%,　which　is　much　lower　than　crystals　prepared　by　the　Czochralski　method,　All　the　as　grown　crystals　had　high　transmittance　above　80%　with　increasing　wavelength　from　about　500　nm.　With　increasing　Ca　content　in　crystal,　symmetric　bending　mode　15　and　symmetric　stretching　mode　nu(2)　broadened　and　moved　to　the　low　wave　number.　The　relative　intensity　of　Raman　peak　vs　compared　to　nu(2)　increasing　gradually　indicates　that　the　NbO6　octahedral　distortion　degree　increased.　(C)　2014　Elsevier　B.V.　All　rights　reserved.