Thermal conductivity and thermal expansion of L12 intermetallic compounds based on rhodium

Yoshihiro Terada, Kenji Ohkubo, Seiji Miura, Juan M. Sanchez, Tetsuo Mohri

Research output: Contribution to journalArticlepeer-review

22 Citations (Scopus)

Abstract

Thermal conductivity and thermal expansion were measured for the L12 intermetallic compounds Rh3X (X = Ti, Zr, Hf, V, Nb, Ta) in the temperature range between 300 and 1100 K to evaluate the feasibility of applying the compounds to high temperature structural materials. The thermal conductivities of Rh3X are widely distributed in the range from 32 to 103 W m-1 K-1 at 300 K, while the difference of the thermal conductivities becomes less emphasized at higher temperatures. A trend is observed that the thermal conductivity of Rh3X is larger when the constituent X belongs to group 5 rather than 4 in the periodic table. The coefficients of thermal expansion (CTE) of Rh3X slightly increase with increasing temperature, and they are concentrated around 10 × 10-6 K-1 at 800 K. A trend is that the CTE of Rh3X is reduced as the position of X goes downward in the periodic table. It is demonstrated that Rh3Nb and Rh3Ta are suitable for high temperature structural applications due to the larger thermal conductivities and the smaller CTE.

Original languageEnglish
Pages (from-to)202-207
Number of pages6
JournalJournal of Alloys and Compounds
Volume354
Issue number1-2
DOIs
Publication statusPublished - 2003 May 12

Keywords

  • Heat conduction
  • Intermetallics
  • Structural materials
  • Thermal expansion

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

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