Peak ratio (200) means relative peak intensities of (200) orientation, the higher peak ratio represents highly oriented crystalline properties .The peak ratio (200) was in creased in the compositional range of 0.12–0.18. It means that crystallites grown for (200) orientation was improved by increasing BKT composition.However, x¼0.30,the (1x)BNT–xBKT ceramics has low value of peak ratio .It can be concluded that(200) orientation was decreased by increasing the BKT composition. These peak ratios behaviors are well coincided with the FWHM values up to x¼0.20. The high FWHM value means a finer crystal structure with similar orientation [20]. As shown in the figure,the FWHM was in creased by increasing BKT compositions up to x¼0.20. The relationship between the grainsize and FWHM can be explained by Scherrer's equation [21]