This volume contains peer-reviewed papers presented at the 9th International Conference on Materials Science (ICMS 2020) held at Ulaanbaatar, Mongolia, September 10-12, 2020, focusing on the study of structure, properties, and applications of new materials as well as techniques of materials characterisation. The conference was organized by the Mongolian Physical Society, National University of Mongolia, Inner Mongolia Normal University (China), and Institute of Physical Material Science, SB RAS (Russia).