Dynamics enhanced by HCl doping triggers full Pauling entropy release at the ice XII-XIV transition

被引:21
作者
Koester, K. W. [1 ]
Fuentes-Landete, V. [2 ]
Raidt, A. [1 ]
Seidl, M. [2 ]
Gainaru, C. [1 ]
Loerting, T. [2 ]
Boehmer, R. [1 ]
机构
[1] Tech Univ Dortmund, Fak Phys, D-44221 Dortmund, Germany
[2] Univ Innsbruck, Inst Phys Chem, A-6020 Innsbruck, Austria
来源
NATURE COMMUNICATIONS | 2015年 / 6卷
基金
奥地利科学基金会;
关键词
REVERSIBLE PHASE-TRANSITION; NEUTRON POWDER DIFFRACTION; LOW-TEMPERATURE DYNAMICS; PARTIALLY ORDERED ICE; DOPED ICE; DIELECTRIC-PROPERTIES; DISORDERED STRUCTURE; RESIDUAL ENTROPY; SLOW RELAXATION; AMORPHOUS ICE;
D O I
10.1038/ncomms8349
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
The pressure-temperature phase diagram of ice displays a perplexing variety of structurally distinct phases. In the century-long history of scientific research on ice, the proton-ordered ice phases numbered XIII through XV were discovered only recently. Despite considerable effort, none of the transitions leading from the low-temperature ordered ices VIII, IX, XI, XIII, XIV and XV to their high-temperature disordered counterparts were experimentally found to display the full Pauling entropy. Here we report calorimetric measurements on suitably highpressure- treated, hydrogen chloride-doped ice XIV that demonstrate just this at the transition to ice XII. Dielectric spectroscopy on undoped and on variously doped ice XII crystals reveals that addition of hydrogen chloride, the agent triggering complete proton order in ice XIV, enhances the precursor dynamics strongest. These discoveries provide new insights into the puzzling observation that different dopants trigger the formation of different proton-ordered ice phases.
引用
收藏
页数:7
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