A novel coordination polymer, [Fe(C 5H 4NCOO) 2] n, was synthesized by hydrothermal reaction and characterized by elemental analysis as well as IR spectroscopy. The crystal structure (with a novel 3-D network) of this...A novel coordination polymer, [Fe(C 5H 4NCOO) 2] n, was synthesized by hydrothermal reaction and characterized by elemental analysis as well as IR spectroscopy. The crystal structure (with a novel 3-D network) of this compound belongs to monoclinic, space group P2 1/n, a=0.49544(1) nm, b=1.32443(2) nm, c=1.04983(1) nm, β=101.586(1)°. The diffuse reflectance spectra (200～2500 nm) showed that the polymer had strong absorbance in 375～563 nm (E g≈2.5 eV) region and weak absorbance from 720 to 2500 nm (near infrared spectra).展开更多
The Fe48Cr15Mo14Er2C15B6amorphous steel can hardly be used as an engineering material because of its ex- treme brittleness and very low iron content. By changing the composition of the nonmagnetic amorphous steel, and...The Fe48Cr15Mo14Er2C15B6amorphous steel can hardly be used as an engineering material because of its ex- treme brittleness and very low iron content. By changing the composition of the nonmagnetic amorphous steel, and using the relation between the reduced glass transition tempera- ture Trg and the glass forming ability, a new amorphous Fe56Mn5Cr7Mo12Er2C12B6 alloy with good glass forming abil- ity and high iron content was obtained. The diameter of the as-cast sample rod reached 8 mm. This new amorphous steel has lower manufacturing cost due to its high iron content, and thus it can have wider applications.展开更多
在Ni70Mn25Co5-C体系中添加含氢化合物Fe(C5H5)2作为新型氢源,利用温度梯度法,在压力为5.5—6.0 GPa、温度为1280—1400°C的条件下,成功合成出氢掺杂的宝石级金刚石大单晶.通过傅里叶显微红外光谱发现,随着Fe(C5H5)2添加量的增加,...在Ni70Mn25Co5-C体系中添加含氢化合物Fe(C5H5)2作为新型氢源,利用温度梯度法,在压力为5.5—6.0 GPa、温度为1280—1400°C的条件下,成功合成出氢掺杂的宝石级金刚石大单晶.通过傅里叶显微红外光谱发现,随着Fe(C5H5)2添加量的增加,合成晶体中与氢相关的对应于sp3杂化C—H键的对称伸缩振动和反对称伸缩振动的红外特征峰2850和2920 cm 1逐渐增强,而晶体中氮含量却逐渐减少.通过合成晶体的拉曼光谱分析发现,金刚石的拉曼峰伴随Fe(C5H5)2的添加向高频偏移,这表明氢的进入在金刚石内部产生了压应力.观察扫描电子显微镜图像发现,在低含量Fe(C5H5)2添加时晶体表面平滑,而高含量添加时晶体表面缺陷增多,且呈现出气孔状.使用新的添加剂Fe(C5H5)2作为氢源,合成出含氢宝石级金刚石单晶,丰富了金刚石单晶中对氢的研究内容,也可为理解天然金刚石的形成机理提供帮助.展开更多
文摘A novel coordination polymer, [Fe(C 5H 4NCOO) 2] n, was synthesized by hydrothermal reaction and characterized by elemental analysis as well as IR spectroscopy. The crystal structure (with a novel 3-D network) of this compound belongs to monoclinic, space group P2 1/n, a=0.49544(1) nm, b=1.32443(2) nm, c=1.04983(1) nm, β=101.586(1)°. The diffuse reflectance spectra (200～2500 nm) showed that the polymer had strong absorbance in 375～563 nm (E g≈2.5 eV) region and weak absorbance from 720 to 2500 nm (near infrared spectra).
基金This work was supported by the National Natural Science Foundation of China(Grans No.50371098 and 50321101)the Key Project of the Beiing Science and Technology Program(Contract No.H02040030320).
文摘The Fe48Cr15Mo14Er2C15B6amorphous steel can hardly be used as an engineering material because of its ex- treme brittleness and very low iron content. By changing the composition of the nonmagnetic amorphous steel, and using the relation between the reduced glass transition tempera- ture Trg and the glass forming ability, a new amorphous Fe56Mn5Cr7Mo12Er2C12B6 alloy with good glass forming abil- ity and high iron content was obtained. The diameter of the as-cast sample rod reached 8 mm. This new amorphous steel has lower manufacturing cost due to its high iron content, and thus it can have wider applications.
文摘在Ni70Mn25Co5-C体系中添加含氢化合物Fe(C5H5)2作为新型氢源,利用温度梯度法,在压力为5.5—6.0 GPa、温度为1280—1400°C的条件下,成功合成出氢掺杂的宝石级金刚石大单晶.通过傅里叶显微红外光谱发现,随着Fe(C5H5)2添加量的增加,合成晶体中与氢相关的对应于sp3杂化C—H键的对称伸缩振动和反对称伸缩振动的红外特征峰2850和2920 cm 1逐渐增强,而晶体中氮含量却逐渐减少.通过合成晶体的拉曼光谱分析发现,金刚石的拉曼峰伴随Fe(C5H5)2的添加向高频偏移,这表明氢的进入在金刚石内部产生了压应力.观察扫描电子显微镜图像发现,在低含量Fe(C5H5)2添加时晶体表面平滑,而高含量添加时晶体表面缺陷增多,且呈现出气孔状.使用新的添加剂Fe(C5H5)2作为氢源,合成出含氢宝石级金刚石单晶,丰富了金刚石单晶中对氢的研究内容,也可为理解天然金刚石的形成机理提供帮助.
