The new mixed borates with formula(Rb 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O and Cs 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O)were prepared by reaction Rb (Cs )-borate aqueous solution with CaCl 2 .Two kinds of compounds w...The new mixed borates with formula(Rb 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O and Cs 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O)were prepared by reaction Rb (Cs )-borate aqueous solution with CaCl 2 .Two kinds of compounds were characterized by chemical analysis,X-ray powder dif fraction,FT-IR spectra and thermal analysis.展开更多
Single crystalline calcium chloroborate（Ca2B5O9Cl） whiskers with uniform diameter have been fabricated by a two-step process. The precursor was firstly prepared by the sedimentation reaction between CaCl2, H3BO3 and...Single crystalline calcium chloroborate（Ca2B5O9Cl） whiskers with uniform diameter have been fabricated by a two-step process. The precursor was firstly prepared by the sedimentation reaction between CaCl2, H3BO3 and Na OH aqueous solutions, and then sintered at different temperatures for 6 h with KCl as flux. The XRD indicates that the product synthesized at 600 °C is Orthorhombic Ca2B5O9Cl. SEM and TEM results show that the Ca2B5O9Cl is whisker with the diameter about 0.2-0.5 μm and the length up to 15 μm. SAED analysis shows that the whisker is single crystalline and grows along [001] direction. The possible formation process and growth mechanism were proposed.展开更多
文摘The new mixed borates with formula(Rb 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O and Cs 2 Ca [B 4 O 5 (OH) 4 ] 2 ·8H 2 O)were prepared by reaction Rb (Cs )-borate aqueous solution with CaCl 2 .Two kinds of compounds were characterized by chemical analysis,X-ray powder dif fraction,FT-IR spectra and thermal analysis.
基金Funded by the National Natural Science Foundation of China(No.51402323)the West Light Foundation of the Chinese Academy of Sciences(No.Y412031006)the Natural Science Foundation of Qinghai Province,China(No.2014-ZJ-938Q)
文摘Single crystalline calcium chloroborate（Ca2B5O9Cl） whiskers with uniform diameter have been fabricated by a two-step process. The precursor was firstly prepared by the sedimentation reaction between CaCl2, H3BO3 and Na OH aqueous solutions, and then sintered at different temperatures for 6 h with KCl as flux. The XRD indicates that the product synthesized at 600 °C is Orthorhombic Ca2B5O9Cl. SEM and TEM results show that the Ca2B5O9Cl is whisker with the diameter about 0.2-0.5 μm and the length up to 15 μm. SAED analysis shows that the whisker is single crystalline and grows along [001] direction. The possible formation process and growth mechanism were proposed.
