汇报标题(中文)：沸石、非晶化与“美满”玻璃
汇报标题(英文)：ZEOLITES, AMORPHISATION and PERFECT GLASSES
汇报内容简介：Under pressure, crystals transform into amorphous structures well below the melting point Tm. The amorphisation of zeolite crystals is particularly interesting, as this can also be achieved at ambient pressure by employing only modest temperatures. Different thermobaric stress rates reveal the dynamics of microporous collapse as well as the existence of a supercooled intermediate. This is topologically equivalent to the zeolitic precursor, but also extremely strong – approximately twice as strong as silica, usually considered the strongest glass-forming liquid. A low entropy or “perfect glass” is formed on depressurising or cooling, whose mechanical properties are distinct from a glass conventionally quenched from the molten state. Both types of glass are polymorphs and the amorphisation process can be envisaged as a pair of first order phase transitions: crystal-liquid and liquid-liquid (Greaves et al, Nature Materials, 2, 622-629 (2003); Science 308, 1299 (2005)). The talk will introduce these ideas and also report recent work on the amorphisation of zeolitic imidazolate frameworks (ZIFs). Like inorganic zeolites the structural relaxation times of amorphising hybrid ZIFs extend over several minutes, comparable to time scales encountered at the glass transition Tg, and uncovering the existence of novel organic-inorganic supercooled liquids.
汇报人姓名：G.N. Greaves
汇报人简介(中文)：英国亚伯大学资深钻研教授。Greaves教授成名于他对无序资料，出格是玻璃和非晶固体的大量贡献。他是英国同步辐射资料学权威，八十年代率先开发了X射线吸收精密结构谱技术。他是最早利用同步光源X射线散射和谱学钻研玻璃资料的科学家之一，并在若何“观察”这些资料方面获得了突破和原创性的成就。出格是他的“改进的随机框架”模型，固然在早期提出时颇具争议，此刻已经成为钻研硅酸盐玻璃最为沉要的参照。 最近他更成为在发展和利用X射线和中子散射技术在线钻研氧化物熔盐的高温结构和动力学的重要带头人。他在高档次期刊上颁发了大量的有关论文，在液体与玻璃态“多非晶型”这一沉要景象方面的发现已经吸引了多多的不仅是来自氧化物资料和玻璃资料学术领域、甚至是理论化学和凝聚态物理方面科学家的极大兴致。他在高压致低密度晶体的“非晶化”及相改观力学钻研是固体物理学极为凸起和前沿的新钻研方向。Greaves先后获“上海市海表名师”和上海市表专局“高端表国专家”项目支持在亿万先生MR发展合作与互换。
汇报人简介(英文)：Senior Research Professor of University of Alberta UK. Professor Greaves is well-known for his substantial contributions to disordered materials, particularly glass and amorphous solids. He is the authority of the British synchrotron radiation materials science and pioneered the development of X-ray absorption fine structure spectroscopy techniques in 1980s. He was the first material scientist to study glass material using X-ray scattering of synchrotron light sources and Spectroscopic Studies, and achieving a breakthrough and original results about how to "observe" these materials. Especially his "improved random frame" model, although in the early proposed, controversial, has now become the most important research silicate glass reference. Recently, he became the main leaders in the development and application of online research in oxide high-temperature molten salt structure and dynamics using X-ray and neutron scattering techniques. He has published a number of related papers in the liquid and glass . "multi-amorphous" aspect of this important phenomenon has attracted a large number of great interest not only in the oxide material and glass materials from the academic field, and even in theoretical chemistry and condensed matter physics scientist. It is very prominent and cutting-edge new research directions in low-density crystals "amorphous" caused by hypertension and phase transformation kinetics of solid state physics . Greaves has won the "Shanghai Overseas teacher" and the Shanghai Municipal Bureau of Foreign Experts "high-end foreign experts" project support at Shanghai University, cooperation and communication.
汇报人单元(中文)：英国亚伯大学数学、物理与推算机科学学院 ；剑桥大学冶金与资料科学系
汇报人单元(英文)：Institute of Mathematics, Physics and Computer Sciences, Aberystwyth University, UK Department of Materials Science & Metallurgy, University of Cambridge
汇报功夫：2013-09-16 09:00
汇报地址：金属楼2楼会议室（亿万先生MR耽搁校区）
联系人：周忠福
联系方式：18516005600
