Thermal expansion of Ni2.08Mn0.96Ga0.96 alloy

The temperature dependence of the thermal expansion of polycrystalline Ni 2.08 Mn 0.96 Ga 0.96 alloy samples is studied in the as-cast state and after homogenizing annealing. A sample in which twins are mainly oriented normal to the sample length shortens jumpwise during the martensitic transformation. A sample in which twins are parallel to its length elongates jumpwise. After annealing, both samples do not exhibit a jumplike change in length during the phase transformation. When an annealed sample is cooled in a magnetic field, its length again changes jumpwise in the phase transformation range.