We measured integrated intensities of 26 reflections of the B2-phase of titanium
nickelide single crystal and determined structure factors for these reflections. Based on the structure
factors, mean squares of displacements of Ni and Ti atoms with respect to the crystal-lattice sites
have been determined. After that we determined the mean squares of atomic displacements <u2>Ni
and <u2>Ti in temperature range of existence of the B2-pase, at temperatures Т1=328 K and T2=376
K. We separated the mean squares of atomic displacements <u2>Ni and <u2>Ti into static and
dynamic ones. The mean squares of dynamic displacements of Ni and Ti atoms are identical, but the
mean square of static displacements is greater by a factor of 4.7 for Ni atoms than for Ti atoms. The
Debye temperature calculated from the mean squares of displacements of Ni atoms is 360 K; that
calculated for Ti atoms in a similar way is 390 K. The large value of complete atomic displacements
in TiNi is due to static rather than dynamic displacements of atoms, mainly due to static
displacements of nickel atoms.
An overview of the interatomic correlation moments and the mean square relative atomic displacements in anharmonic crystals