荷兰代尔夫特理工大学Ekkes Brück教授:Efficient energy-conversion near room-temperature with transition metal based magnetic materials
日期:2018-04-09 浏览量:494

报告题目:Efficient energy-conversion near room-temperature with transition metal based magnetic materials

报 告 人:Professor Ekkes Brück(Delft University of Technology, Holand)

报告时间:2017年12月5日(星期二)上午9:00

地点:14号楼205

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                                                            材料科学与工程学院
                                                              2017年12月4日

                                    

报告人简介:
Ekkes Brück教授,1991年获阿姆斯特丹大学物理学博士学位(Ph. D)。1992年开始在阿姆斯特丹大学实验物理系工作,历任研究员、副教授。2008年开始任代尔夫特理工大学应用科学学院教授,并任应用科学学院材料和能源基础系主任,同时也是荷兰皇家科学及人文学会会员。2014年1月开始与我校联合培养博士研究生,主要从事新能源材料及器件研发制备及表征等方面的研究,是磁制冷技术方面国际知名专家,全球磁制冷行业的领跑者之一,Thermag、Intermag等国际会议的组委,著名国际学术期刊Journal of Magnetism and Magnetic Materials等的合作编辑,H-index指数为36。截至目前为止,已在权威期刊发表论文400余篇,被引用次数超过7200次(ISI)。与BASF公司及FOM合作,他的团队(FAME)是全球最好的新能源材料研究团队之一。
报告内容:
Magneto-caloric power conversion can be used to convert heat into electricity that up to now was considered as waste. This new technology therefore has the potential to significantly contribute to the energy transition on a global scale.
With the advent of giant magneto-caloric effects (MCE) that occur in conjunction with magneto-elastic or magneto-structural phase transition of first order (FOT), room temperature heat-pump applications became feasible. In this context the MnFe(P,X) system is of particular interest as it contains earth abundant ingredients that are not toxic. This material family derives from the Fe2P compound, a prototypical example known since a long time to exhibit a sharp but weak FOT at 210 K (-63°C).
Magneto-caloric power-conversion calls for a somewhat different combination of properties, in particular a large latent heat that is favourable for a heat-pump, is detrimental for power conversion as a lot of heat is needed to change the temperature. Yet a large change of magnetization is required, which suggests one should either employ materials exhibiting exchange inversion or second order materials. Magnetically highly responsive materials in combination with the field generated by a permanent magnet open the way to new technology for magnetic refrigeration, heat pumps and power generation. Employing the highly efficient coupling between the degrees of freedom of magnetic spins and lattice vibrations in a solid, will render energy conversion and energy generation technologies that get close to the theoretical limits.


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