AbstractA simple approach of the study of phase equilibria in niobium‐germanium alloys involves passing a floating molten zone along the alloy, cutting the resolidified rod into several, and analysing these sections by X‐ray fluoresce spectrometry and X‐ray diffraction. The relative net X‐ray fluorescent intensities were corrected for negative absorption effects, using a semi‐empirical procedure. The ‘effective wavelengh’ for exicitation of niobium and of germanium were deduced from experimental alpha