CAJ | 학술논문

采用超声化学法,以CaCl2与不同氟源(NaBF4、K2SiF6)在溶液中反应,制得了不同形貌的CaF2微米晶(立方体、花状、多面体).用XRD、SEM及TEM对产物晶相及形貌进行了表征.XRD结果显示所有产物均为结晶良好的立方相CaF2.SEM及TEM结果表明由NaBF4制得的产物形貌为均匀的立方体微米晶,而由K2SiF6制得的产物为多面体.在添加配体Na2EDTA的情况下,由NaBF4得到的产物为纳米片组成的花状结构.本文详细讨论了氟源种类、反应物比例、配体等反应参数对产物CaF2形貌的影响,并提出了可能的反应机理.
채용초성화학법,이CaCl2여불동불원(NaBF4、K2SiF6)재용액중반응,제득료불동형모적CaF2미미정(립방체、화상、다면체).용XRD、SEM급TEM대산물정상급형모진행료표정.XRD결과현시소유산물균위결정량호적립방상CaF2.SEM급TEM결과표명유NaBF4제득적산물형모위균균적립방체미미정,이유K2SiF6제득적산물위다면체.재첨가배체Na2EDTA적정황하,유NaBF4득도적산물위납미편조성적화상결구.본문상세토론료불원충류、반응물비례、배체등반응삼수대산물CaF2형모적영향,병제출료가능적반응궤리.
Different morphological CaF2 crystals (cubes,flowers,polyhedra) were synthesized via a mild sonochemical route from an aqueous solution of CaCl2 and NaBF4 or K2SiF6.The crystal structures and morphologies of the products were characterized by using XRD,SEM and TEM.The results show that the asprepared products are cubic structure and with high crystallinity.Uniform microcubes and polyhedra can be easily synthesized from NaBF4 and K2SiF6,respectively.In the presence of complex agent Na2EDTA,uniform 3D flower-like CaF2 hierarchical structures were prepared and assembled by numerous nanoflakes.Some reaction parameters (fluoride source,molar ratio and chelating reagent) were investigated during the process of obtaining different morphological CaF2.Furthermore,a possible reaction mechanism for the growth of CaF2 is proposed.