Physical property measurement System

我们申请一种低维护的无低温磁体，带有9 T磁体，具有模块化测量选项：交流和直流磁化率、振动样品磁强计、标准温度范围2-400 K和高达1000 K的烘箱选项、导电性、导热性、比热、高压条件下的磁性测量和膨胀法。磁性化学和无机固态化学是威斯法利大学自然科学学院的两个支柱。除了新固体的合成和结构表征外，结构-性质关系的研究对于全面理解材料起着核心作用。贡献团体在专题上具有广泛的基础。物质类别包括稀土和过渡金属基金属间化合物、离子导体、电池材料、热电材料、光响应材料、矿物和有机自由基。PPMS需要不同的测量模块来处理不同的材料属性。基本的磁化学特性(依赖于温度和磁场的磁化率和磁化强度测量)将得到最广泛的应用。申请者小组在这一领域拥有长期的经验，并将与所有合作小组分享这一专业知识。为了对磁化学特性进行创新性扩展，我们希望安装一个高压室(最高1.3 Gpa)，用于来自地球科学的样品(Klemmegroup的专门知识)和金属间化合物。在磁性测量的同时，还将测量比热数据，以便获得磁性相变和结构相变的定量数据。这涉及金属间稀土化合物、几种有机自由基和来自地球科学的样品以及离子导体。电阻率将被用作基本表征(金属和半导体化合物)的补充工具。对于磁性有序化合物，电阻率测量提供了关于有序温度和自旋无序散射的额外信息。该选项将在高达400K的整个温度范围内使用，热导率测量对于热电材料的表征至关重要(Zeier集团的专业知识)。此外，这些测量将常规地进行到400K。更多有趣的项目涉及热膨胀。这是金属间化合物的结构相变和磁性相变以及离子导体和热电材料的晶格非谐性的重要参数。新的膨胀仪可以解决这些问题。

We apply for a low-maintainance cryogen-free magnetic device with a 9 T magnet with modular measurement options: ac and dc susceptibility, vibrating sample magnetometer, standard temperature range 2-400 K and oven option up to 1000 K, electrical conductivity, thermal conductivity, specific heat, magnetic measurements under high-pressure conditions and dilatometry. Magnetochemistry and Inorganic Solid State Chemistry are two supporting pillars in the natural science faculty of the Westfälische Wilhelms-Universität. Besides synthesis and structural characterization of new solids, the study of structure-property relationships plays a central role for a full understanding of the materials. The contributing groups are topically broadly based. The substance classes cover rare earth and transition metal based intermetallic compounds, ionic conductors, battery materials, thermoelectrics, photoresponsice materials, minerals and organic radicals. The different measurement modules of the PPMS are required for addressing the varying materials properties. The basic magnetochemical characterization (temperature- and field-dependent susceptibility and magnetization measurements) will most widely be used. The applicant group has long-term experience in this field and will share this expertize with all collaborating groups. For an innovative extension for the magnetochemical characterization we wish to install a high-pressure cell (up to 1.3 GPa), for samples from geosciences (expertise in the Klemmegroup) and for intermetallics. In parallel to the magnetic measurements, specific heat data will be measured, in order to get quantitative data for magnetic and structural phase transitions. This concerns intermetallic rare earth compounds, several organic radicals and samples from geosciences as well as ionic conductors. Electrical resistivity will be used as complementary tool for the basic characterization (metallic and semiconducting compounds). For magnetically ordering compounds, resistivity measurements give additional information on the ordering temperature and with respect to spin-disorder-scattering. This option will be used in the whole temperature range up to 400 K. Thermal conductivity measurements are essential for the characterization of thermoelectric materials (expertise in the Zeier group). Also these measurements will be conducted routinely up to 400 K. Further interesting projects concern thermal expansion. This is an important parameter for structural and magnetic phase transitions of intermetallic compounds as well as for lattice anharmonicity of ionic conductors and thermoelectrics. The new dilatometer allows to address these questions.