A superconducting phase with transition temperature of 23 K found in t
he Y-Pd-B-C system was identified to have a body-centered tetragonal s
tructure with the lattice parameters of a = 0. 38 nm and c = 1. 08 nm.
The phase is of a platelike shape embedded in a matrix of other phase
s. The composition ratio of the superconducting phase determined using
an electron probe X-ray microanalyzer is YPd2B2C1.5, although there m
ay be uncertainty of the C concentration. The observation by high-reso
lution transmission electron microscopy indicates that the crystal str
ucture is very similar to that reported recently for the superconducti
ng LuNi2B2C intermetallic compound.