Electrochemically deposited thin films of amorphous Fe-P alloy Part I. Chemical composition and phase structure characterization

Abstract

Thin Fe-P alloy films (0.5 to 25.0 mu m thick) were electrodeposited from sulfate solutions. The influences of various deposition conditions (current density, time, pH and temperature) on the composition and structure of the deposited films were examined. These Fe-P films were first characterized by the ALSV. The voltammograms obtained show several current peaks, indicating the presence of several different phase structures in the deposit. Chemical composition of the phase structures in the film was determined by EDX analysis and the amorphous nature of the alloy was verified by XRD and DTA techniques. Chemical and phase structure compositions of the alloys (containing 15-50 at.% P in the form of phosphides FeP, Fe2P and/or Fe3P) were found to depend on deposition conditions. Appearance and morphology of the film alloys were also found to depend on deposition conditions, particularly current density, as illustrated by the SEM technique.