摘要
The simultaneous control of crystal phase stability and one-dimensional growth has always been the major challenge for the preparation of tetragonal zirconia whiskers.In this study,we report a facile molten salt processing that utilizes CaF_(2) as a stabilizer and adsorbent to meet the phase and morphology requirements.The processes of stabilization,phase transition,ion adsorption and formation of special morphology involved in zirconia growth were investigated by XRD,IR,SEM,DTA-TG and TEM.By controlling the amount of CaF_(2)(15 wt%)added in the reaction precursor,tetragonal zirconia whiskers with a desired aspect ratio(>16)can be synthesized,which show single crystalline nature and[001]preferred direction.Ca ions doped at low temperature inhibit the occurrence of phase transition,which allows the tetragonal structure to be retained to room temperature.The inducement and pattern of whisker growth are supposed to be F-adsorption and screw dislocation elongation,respectively.The specific selectivity of surface adsorbed ions to certain zirconia crystal planes reduces or even inhibits the epitaxial growth rate in this direction,offering a viable avenue for the morphology modulation of inorganic nanomaterials.
基金
supported by the National Natural Science Foundation of China[grant numbers 51662016,51962014,52072162]
the Key Research and Development Program of Jiangxi Province,China[grant number 20192BBEL50022]
the Key projects of Youth Fund of Jiangxi Province,China[grant number 20202ACBL214006,20202ACBL214008]
the Key Science Foundation of Jiangxi Provincial Department of Education,China[grant number GJJ180699]
the Scientific Research Fund of Jiangxi Provincial Education Department(grant number GJJ160881)
the Youth Science Foundation of Jiangxi Provincia Department of Education,China[grant number GJJ180740]。
