| γ-Fe-Mn-Ge系合金的反铁磁－转变及其物理性能反常研究 | |
| 曾鸿斌 | |
| Subtype | 硕士 |
| Thesis Advisor | 张彦生 |
| 1988 | |
| Degree Grantor | 中国科学院金属研究所 |
| Place of Conferral | 中国科学院金属研究所 |
| Abstract | 本文测定了γ-Fe-31Mn合金中加入非过渡族元素Ge的合金的磁化率，电阻率、弹性模量热膨胀随温度变化的关系以及室温下的Mossbauer吸收谱。结果表明，Ge对γ-Fe-Mn合金的反铁磁转变及其伴随的反常电阴有强烈影响，使反常热膨胀略有减小，但对弹性模量影响不明显。我们认为加入元素的S.P外层电子进入了基合金的d能带，减弱了3d电子的巡游特性，电阻率反常与反铁磁能隙的形成有关，Ge的加入促进了能隙的形成。 |
| Other Abstract | The temperature dependences of susceptibility, electrical resistivity, Young's elastic modulus, thermal expansion and the Mossbauer absorption spectra at room temperature were measured for γ-Fe-31Mn based alloys containing the non-transition metal Ge (2.0at.%, 3.5at.%, 5.6at.%, 8.7at.%). The results show that the addition of Ge may remarkably affect the paramagnetic-antiferromagnetic transition of based alloys as well as the accompanying anomaly of resistivity. The influence of Ge content on the Young's elastic modulus and thermal expansion of tested alloys is not notable besides making their anomaly change temperatures decrease with the reduce of the Neel point. The Mossbauer fitting results indicate that the addition of Ge has decreased the internal magnetic field of γ-Fe-Mn based alloys. We suggest that Ge contained in γ-Fe-Mn based alloys acts as a electron donor, the s, p valence electrons of Ge has entered the d energy band of the based alloys. The anomaly of electrical resistivity has something to do with the anti-ferromagnetic energy gap near Fermi surface, the addition of Ge has promoted the forming of this energy gap. |
| Pages | 10 |
| Language | 中文 |
| Document Type | 学位论文 |
| Identifier | http://ir.imr.ac.cn/handle/321006/17330 |
| Collection | 中国科学院金属研究所 |
| Recommended Citation GB/T 7714 | 曾鸿斌. γ-Fe-Mn-Ge系合金的反铁磁－转变及其物理性能反常研究[D]. 中国科学院金属研究所. 中国科学院金属研究所,1988. |
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