Synthesis of Mg₂B₂O₅ whiskers via coprecipitation and sintering process

Dong-hai Zhu 1,2),Xue-ying Nai 1),Cheng-cai Zhu 1,2),Feng-qin Guo 3),Shao-ju Bian 1),and Wu Li 1) 1) Qinghai Institute of Salt Lakes,Chinese Academy of Sciences,Xining 810008,China 2) Graduate University of Chinese Academy of Sciences,Beijing 100049,China 3) Department of Basin Education,Qinghai University,Xining 810016,China

摘 要：Mg₂B₂O₅ whiskers with high aspect ratio were synthesized by coprecipitation and sintering process using MgCl 2.6H 2 O,H 3 BO 3,and NaOH as raw materials and KCl as a flux.Their formation process was investigated by thermogravimetry and differential scanning calorimetry（TG-DSC）,X-ray diffraction（XRD）,and scanning electron microcopy（SEM）.It is found that the products synthesized at 832℃ are monoclinic Mg 2 B 2 O 5 whiskers with a diameter of 200-400 nm and a length of 50-80 μm.Transmission electron microscopy（TEM） and selected area electron diffraction（SAED） analyses show that the whiskers obtained at 832℃ are single crystalline and grow along with the [010] direction.The growth mechanism of Mg₂B₂O₅ whiskers was also presented.

关键词：