Anomalous physical properties of Heusler-type Co2 Cr (Ga,Si) alloys and thermodynamic study on reentrant martensitic transformation

Xiao Xu, Makoto Nagasako, Mitsuo Kataoka, Rie Y. Umetsu, Toshihiro Omori, Takeshi Kanomata, Ryosuke Kainuma

研究成果: Article査読

17 被引用数 (Scopus)

抄録

Electronic, magnetic, and thermodynamic properties of Co2Cr(Ga,Si)-based shape-memory alloys, which exhibit reentrant martensitic transformation (RMT) behavior, were studied experimentally. For electric resistivity (ER), an inverse (semiconductor-like) temperature dependence in the parent phase was found, along with anomalous behavior below its Curie temperature. A pseudobinary phase diagram was determined, which gives a "martensite loop" clearly showing the reentrant behavior. Differential scanning calorimetry and specific-heat measurements were used to derive the entropy change ΔS between martensite and parent phases. The temperature dependence of the derived ΔS was analyzed thermodynamically to confirm the appearances of both the RMT and normal martensitic transformation. Detailed studies on the specific heat in martensite and parent phases at low temperatures were also conducted.

本文言語English
論文番号104434
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
91
10
DOI
出版ステータスPublished - 2015 3月 31

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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