We report the results of low temperature resistivity and magnetization measurements on polycrystalline samples of four Ni-Sb compounds, Ni3 Sb, Ni5 Sb2, NiSb, and NiSb2. Resistivity measurements revealed that these co...We report the results of low temperature resistivity and magnetization measurements on polycrystalline samples of four Ni-Sb compounds, Ni3 Sb, Ni5 Sb2, NiSb, and NiSb2. Resistivity measurements revealed that these compounds exhibit a metallic type of electrical conductivity. Temperature dependences of the resistivities were well fitted by the generalized Bloch--Griineisen formula v^ith an exponent of n ^- 3, indicating that the s--d interband scattering is the dominant scatter- ing mechanism. The magnetic susceptibilities of NisSb2, NiSb, and NiSb2 are almost independent of temperature （above 150 K）, exhibiting Pauli paramagnetic behavior. The temperature dependences of the susceptibilities were fitted using the Curie-Weiss law. Ni3Sb was found to have a paramagnetic-ferromagnetic phase transition at 229 K. First-principles calculations have been performed to investigate the electronic structures and physical properties of these Ni-Sb alloys. The calculation of the band structure predicted that Ni3Sb, NisSb2, NiSb, and NiSb2 have char- acteristics of metal, and the ground state of Ni3Sb is ferromagnetic. The electrical and magnetic properties observed experimentally are consistent with that predicted by the first-principle electronic structure calculations.展开更多
文摘目的探讨腹腔镜脾切除术治疗外伤性脾破裂的可行性与安全性。方法选取我院在2013年收治的8例外伤性脾破裂患者,男性患者5例,女性患者3例。Ⅱ级损伤2例,Ⅲ级损伤3例,合并其他脏器损伤3例。对患者进行腹腔镜脾切除手术治疗。结果 8例患者顺利完成手术,没有出现中转开腹现象,手术时间平均110 min,术中出血平均350 m L,无并发症与手术期死亡病例,患者顺利康复。结论腹腔镜脾切除手术治疗外伤性脾破裂效果显著,安全可靠,是一种微创、积极、有效的治疗方法,值得临床推广。
基金Project supported by the National Natural Science Foundation of China(Grant No.21271183)the National Basic Research Program of China(Grant Nos.2011CBA00112 and 2011CB808202)
文摘We report the results of low temperature resistivity and magnetization measurements on polycrystalline samples of four Ni-Sb compounds, Ni3 Sb, Ni5 Sb2, NiSb, and NiSb2. Resistivity measurements revealed that these compounds exhibit a metallic type of electrical conductivity. Temperature dependences of the resistivities were well fitted by the generalized Bloch--Griineisen formula v^ith an exponent of n ^- 3, indicating that the s--d interband scattering is the dominant scatter- ing mechanism. The magnetic susceptibilities of NisSb2, NiSb, and NiSb2 are almost independent of temperature （above 150 K）, exhibiting Pauli paramagnetic behavior. The temperature dependences of the susceptibilities were fitted using the Curie-Weiss law. Ni3Sb was found to have a paramagnetic-ferromagnetic phase transition at 229 K. First-principles calculations have been performed to investigate the electronic structures and physical properties of these Ni-Sb alloys. The calculation of the band structure predicted that Ni3Sb, NisSb2, NiSb, and NiSb2 have char- acteristics of metal, and the ground state of Ni3Sb is ferromagnetic. The electrical and magnetic properties observed experimentally are consistent with that predicted by the first-principle electronic structure calculations.
