Large magnetic-field-induced strains in sintered chromium tellurides
Large magnetic-field-induced strains in sintered chromium tellurides
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DOI：
10.1063/5.0134911
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发表时间：
2022-11
影响因子：
4
通讯作者：
Y. Kubota;Y. Okamoto;Tomoya Kanematsu;T. Yajima;D. Hirai;K. Takenaka
中科院分区：
文献类型：
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作者：
Y. Kubota;Y. Okamoto;Tomoya Kanematsu;T. Yajima;D. Hirai;K. Takenaka
发现Cr 3 Te 4和Cr2 Te 3的烧结样品在磁场下表现出大的应变，伴随着大的体积变化。在350 K以下的整个温度范围内，Cr_3Te_4在施加9 T的磁场时体积增加Δ V/ V = 500-1170 ppm。在室温下，Δ V/ V值超过1000 ppm，这比迄今为止报道的铬基磁体的最大值大得多，并且与因瓦合金中的受迫体积磁致伸缩的室温值相当。Cr2 Te 3在200 K下施加9 T的磁场时显示出680 ppm的大Δ V/ V。这两个样品显示特别大的体积增加周围的居里温度，在那里他们也表现出负的热膨胀，由于微观结构的影响，这表明与磁有序和微观结构效应的各向异性晶格变形之间的合作是必不可少的表现大磁场诱导的体积变化。
Sintered samples of Cr3Te4 and Cr2Te3 are found to show large strains accompanied by large volume changes under a magnetic field. In Cr3Te4, volume increases of Δ V/ V = 500–1170 ppm by applying a magnetic field of 9 T are observed over the entire temperature range below 350 K. At room temperature, the Δ V/ V value exceeds 1000 ppm, which is considerably larger than the maximum values reported for Cr-based magnets, thus far, and is comparable to the room-temperature value of forced-volume magnetostriction in invar alloys. Cr2Te3 shows a large Δ V/ V of 680 ppm when applying a magnetic field of 9 T at 200 K. Both samples display particularly large volume increases around the Curie temperature, where they also show negative thermal expansion due to the microstructural effects, suggesting that the cooperation between anisotropic lattice deformation associated with the magnetic ordering and microstructural effects is essential for the manifestation of the large magnetic-field-induced volume changes.