采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石...采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石的结晶性能,磁性水滑石具有典型的水滑石特征峰,同时含有CoFe2O4特征峰;扫描电镜(SEM)图片显示采用均匀共沉淀法制备磁性水滑石是片层状结构,磁性基质CoFe2O4均匀地吸附在水滑石片层表面;磁性水滑石样品经振动样品磁强计(VSM)测试结果发现磁性水滑石具有铁磁性,样品的比饱和磁化强度随着其中含量增加而增加;差热分析(TG-DTA)结果表明磁性水滑石的热分解特性与纯的水滑石热分解特性相似,磁性基质的引入没有改变水滑石热分解的特征;研究样品对溶液中磷离子吸附率,发现0.15 g 2#样品(Co^2+与Mg^2+摩尔比分别为1∶50)吸附时间为10~20 min时吸附效果最好。展开更多
Homogeneous and dispersed Y3 Al5 O12（yttrium aluminum garnet,YAG） nanopowders were synthesized via a homogeneous co-precipitation method from the mixed solutions of yttrium nitrate,aluminum nitrate and a small amoun...Homogeneous and dispersed Y3 Al5 O12（yttrium aluminum garnet,YAG） nanopowders were synthesized via a homogeneous co-precipitation method from the mixed solutions of yttrium nitrate,aluminum nitrate and a small amount of ammonium sulfate using hot urea as the precipitant.The method has the superiorities that co-precipitation of cations is ensured and continuous decomposition of the hot urea is achieved to obtain the narrow size distribution particles.The addition of small amount of ammonium sulfate surfactant,although has no influence on YAG garnet phase formation,has significant effect on dispersion,particles distribution and sinterability of the resultant YAG and Yb：YAG powders.Compared with the undoped sample,the green body of Yb：YAG doped with ammonium sulfate has higher total shrinkage,linear shrinkage rate and relative density through sintering at 1600 ℃.The resultant Yb：YAG powders can be sintered into transparent ceramics at 1700 ℃ through vacuum sintering.The influence of the sulfate ions on characteristics of the resultant powders was thoroughly studied.展开更多
文摘采用均匀共沉淀法制备了CoFe2O4含量不同的一组磁性水滑石(MgAl-LDHs-CoFe2O4),研究了MgAl-LDHsCoFe2O4晶体结构、微观形貌、磁性能、热稳定性及其对溶液中磷元素的吸收情况。X-射线衍射(XRD)图谱表明少量CoFe2O4的加入没有影响水滑石的结晶性能,磁性水滑石具有典型的水滑石特征峰,同时含有CoFe2O4特征峰;扫描电镜(SEM)图片显示采用均匀共沉淀法制备磁性水滑石是片层状结构,磁性基质CoFe2O4均匀地吸附在水滑石片层表面;磁性水滑石样品经振动样品磁强计(VSM)测试结果发现磁性水滑石具有铁磁性,样品的比饱和磁化强度随着其中含量增加而增加;差热分析(TG-DTA)结果表明磁性水滑石的热分解特性与纯的水滑石热分解特性相似,磁性基质的引入没有改变水滑石热分解的特征;研究样品对溶液中磷离子吸附率,发现0.15 g 2#样品(Co^2+与Mg^2+摩尔比分别为1∶50)吸附时间为10~20 min时吸附效果最好。
基金National Natural Science Foundation of China(51602042,51602045)the Fundamental Research Funds for the Central Universities(N162304004,N162304013)+1 种基金the Natural Science Foundation of Hebei Province(E2017501082)the Scientific Research Foundation of Northeastern University at Qinhuangdao(XNB201715)
文摘Homogeneous and dispersed Y3 Al5 O12（yttrium aluminum garnet,YAG） nanopowders were synthesized via a homogeneous co-precipitation method from the mixed solutions of yttrium nitrate,aluminum nitrate and a small amount of ammonium sulfate using hot urea as the precipitant.The method has the superiorities that co-precipitation of cations is ensured and continuous decomposition of the hot urea is achieved to obtain the narrow size distribution particles.The addition of small amount of ammonium sulfate surfactant,although has no influence on YAG garnet phase formation,has significant effect on dispersion,particles distribution and sinterability of the resultant YAG and Yb：YAG powders.Compared with the undoped sample,the green body of Yb：YAG doped with ammonium sulfate has higher total shrinkage,linear shrinkage rate and relative density through sintering at 1600 ℃.The resultant Yb：YAG powders can be sintered into transparent ceramics at 1700 ℃ through vacuum sintering.The influence of the sulfate ions on characteristics of the resultant powders was thoroughly studied.
