An-Pang Tsai (1958-2019)

It is with great sadness that we report the passing away of An-Pang Tsai on 25 May 2019 at the age of 60.

He was a professor at Tohoku University, Sendai, Japan, and a leader in the field of quasicrystal and complex intermetallic research. His discovery of most of the known stable quasicrystals has been invaluable in understanding the structure and physical properties of these aperiodic crystals. Professor Tsai received many awards including the Medal of Honor with Purple Ribbon bestowed by the Japanese government.

He will be sorely missed by his many friends and colleagues in the crystallographic community. Our thoughts go to his wife, children and family.

A full obituary has been published in Acta Cryst. B.

Images from IUCr Journal articles co-authored by Professor Tsai. Left: Cluster-packing geometry for Al-based F-type icosahedral alloys, right: Atomic structures of ternary Yb–Cd–Mg icosahedral quasicrystals and a 1/1 approximant.