Strain rate effects on pressure-induced amorphous-to-amorphous transformation in fused silica  

作　　者：Wenhao Song Bo Gan Dongxiao Liu Jie Wu Martin T.Dove Youjun Zhang 宋文豪;甘波;刘东晓;吴杰;张友君

机构地区：[1]Institute of Atomic and Molecular Physics,Sichuan University,Chengdu 610065,China [2]National Key Laboratory of Plasma Physics,Laser Fusion Research Center(LFRC),Chinese Academy of Engineering Physics,Mianyang 621900,China [3]Key Laboratory of High Energy Density Physics and Technology of Ministry of Education,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Physics B》2025年第4期71-76,共6页中国物理B(英文版)

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.42422201,12175211,and 12350710177);the Sichuan Science and Technology Program(Grant No.2023NSFSC1910).

摘　　要：Fused silica(SiO_(2)glass),a key amorphous component of Earth’s silicate minerals,undergoes coordination and phase transformations under high pressure.Although extensive studies have been conducted,discrepancies between theoretical and experimental studies remain,particularly regarding strain rate effects during compression.Here,we examine strain rate influences on the shock-induced amorphous–amorphous phase transitions in fused silica by measuring its Hugoniot equation of state and longitudinal sound velocity(CL)up to 7 GPa at strain rates of 10^(6)–10^(7)s^(-1)using a one-stage light-gas gun.A discontinuity in the relationship between shock velocity(US)and particle velocity(UP)and a significant softening in C_(L)of fused silica were observed near~5 GPa under shock loading.Our results indicate that high strain rates restrict Si–O–Si rotation in fused silica,modifying their bonds and increasing silicon coordination.The transition pressure by shock compression is significantly higher than that under static high-pressure conditions(2–3 GPa),which agrees with some recent theoretical predictions with high compression rates,reflecting the greater pressure needed to overcome energy barriers with the strain rate increase.These findings offer insights into strain rate-dependent phase transitions in fused silica and other silicate minerals(e.g.,quartz,olivine,and forsterite),bridging gaps between theoretical simulations and experiments.

关 键 词：fused silica shock compression phase transition kinetics strain rate 

分 类 号：O347.3[理学—固体力学]