Effect of Pressure on the Thermal Expansion of Fe_<72>Pt_<28> Invar Alloy
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The thermal expansion of disordered Fe<SUB>72</SUB>Pt<SUB>28</SUB> Invar alloy has been measured under high pressure up to 2. 2 Gpa in order to clarify pressure effect of spontaneous volume magnetostriction ω<SUB>s</SUB>. Anomalous volume expansion is observed below the Curie temperature T<SUB>C</SUB> both at ambient pressure and high pressures. With increasing pressure, T<SUB>C</SUB> decreases largely with a rate of dT<SUB>C</SUB>/dP=-51 K/GPa. Temperature dependence of ω<SUB>s</SUB> is estimated by considering phonon term of thermal expansion ω<SUB>ph</SUB> (T). ω<SUB>s</SUB> decreases largely with increasing pressure around T<SUB>C</SUB>.
- The Review of High Pressure Science and Technology
The Review of High Pressure Science and Technology 7, 568-570, 1998
The Japan Society of High Pressure Science and Technology