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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Hyperfine interactions and local environment effects in Fe_xNi_(100-x)=55-67 Invar alloys: ~(57)Fe Mossbauer spectroscopy data at 5 K
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Hyperfine interactions and local environment effects in Fe_xNi_(100-x)=55-67 Invar alloys: ~(57)Fe Mossbauer spectroscopy data at 5 K

机译：Fe_xNi_（100-x）= 55-67 Invar合金中的超精细相互作用和局部环境影响：5 K时〜（57）Fe Mossbauer光谱数据

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摘要

A systematic study of the magnetic hyperfine field distribution for ~(57)Fein the Invar alloys Fe_xNi_(100-x)(x= 55, 60, 63, 65 and 67) have been performed by Mossbauer spectroscopy technique at 5 K. The com-position dependences of the magnetic hyperfine fields (B_(hf)), isomer shifts and relative intensities of themagnetic subspectra were measured and analyzed. The reliable data on the correspondence betweenthe B_(hf)magnitude and the type of locale atomic configuration were obtained. It is confirmed that theFe-Ni Invar alloys in their ground state are predominantly collinear ferromagnets with well-definedatomic magnetic moments. Particular emphasis has been placed on the low-field (LF) component of thedistribution (B_(hf)=1.4 and 2.5 T) which is considered as corresponding to the Fe sites with the antiferro-magnetic (AFM) alignment of the magnetic moment. The most striking feature of the LF component isthe anomalous positive isomer shift that corresponds to a large reduction of the local electron densityat the Fe sites. It may be proposed that the volume effect is one of the plausible reasons for the increasein the IS value for LF components. In this case, we should suggest that the formation of the AFM sitesleads to some increase in the local atomic volume. The possible influence of the competition betweenenergetically satisfied and unsatisfied exchange bonds on the stability of the AFM states of the Fe atomsis briefly discussed.
机译：通过Mossbauer光谱技术在5 K下对〜（57）Fe的Invar合金Fe_xNi_（100-x）（x = 55、60、63、65和67）的磁场超精细场分布进行了系统研究。测量并分析了超精细磁场（B_（hf））的位置依赖性，磁亚谱的异构体位移和相对强度。获得了有关B_（hf）量级与区域原子构型类型之间的对应关系的可靠数据。可以肯定的是，处于基态的Fe-Ni Invar合金主要是共线的铁磁体，具有明确的原子磁矩。已经特别强调了分布的低场（LF）分量（B_（hf）= 1.4和2.5 T），该分量被认为对应于具有磁矩反铁磁（AFM）排列的Fe位置。 LF组分最显着的特征是反正异构体的正向位移，这对应于Fe位上的局部电子密度大大降低。可以提出，体积效应是增加LF分量的IS值的合理原因之一。在这种情况下，我们应该建议原子力显微镜位的形成导致局部原子体积的增加。简要讨论了能量满足的和不满足的交换键之间的竞争对铁原子的原子力显微镜状态稳定性的可能影响。

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