EuNdCuS3: Crystal structure of the high-temperature polymorph and properties

The X-ray diffraction structure of the high-temperature polymorph of complex sulfide EuNdCuS3 is determined. The phase we prepared has an orthorhombic structure with the unit cell parameters a = 8.0648(3) , b = 4.0207(1) , c = 15.7924(3) , space group Pnma, Z = 4, Ba2MnS3 type structure. The sample is IR transparent in the range 1800-2800 cm(-1). Thermal expansion coefficient is found to experience jumps, which are characteristic of phase transitions.