"General 2.5 power law of metallic glasses"

Qiaoshi Zeng: Yu Lin, Yijin Liu , Zhidan Zeng, Crystal Y. Shi, Bo Zhang, Hongbo Lou, Stanislav V. Sinogeikin, Yoshio Kono, Curtis Kenney-Benson, Changyong Park, Wenge Yang, Weihua Wang, Hongwei Sheng, Ho-kwang Mao, and Wendy L. Mao; Proceedings of the National Academy of Sciences, 02/16/16.

Additional Authors: Yu Lin, Yijin Liu , Zhidan Zeng, Crystal Y. Shi, Bo Zhang, Hongbo Lou, Stanislav V. Sinogeikin, Yoshio Kono, Curtis Kenney-Benson, Changyong Park, Wenge Yang, Weihua Wang, Hongwei Sheng, Ho-kwang Mao, and Wendy L. Mao

Abstract:

Metallic glass (MG) is an important new category of materials, but very few rigorous laws are currently known for defining its “disordered” structure. Recently we found that under compression, the volume (V) of an MG changes precisely to the 2.5 power of its principal diffraction peak position (1/q1). In the present study, we find that this 2.5 power law holds even through the first-order polyamorphic transition of a Ce68Al10Cu20Co2 MG. This transition is, in effect, the equivalent of a continuous “composition” change of 4f-localized “big Ce” to 4f-itinerant “small Ce,” indicating the 2.5 power law is general for tuning with composition. The exactness and universality imply that the 2.5 power law may be a general rule defining the structure of MGs.