Abstract
Phase transformations and crystal structures in the ternary compounds NdNi (1− x) Cu x were examined with x parameter variation from 0 to 0.3 using X-ray diffraction on powders and single crystals. Three phases were characterized: an orthorhombic CrB type for x values between 0 and 0.175, a new monoclinic variant of the CrB type for x values ranging from 0.175 to 0.20, an orthorhombic FeB type for x values larger than 0.20. The unit cell parameters of the monoclinic variant (space group Pm, Z=16, a=7.603(1), b=8.732(4), c=11.146(3) Å, β=109.91(2)°) are related to the orthorhombic CrB type parameters by the relations a m=2 a, b m=2 c, c m= b− a.
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