Physical property measurement System

我们申请一种低维护无低温磁性装置，带有9 T磁铁，具有模块化测量选项：交流和直流磁化率，振动样品磁力计，标准温度范围2-400 K和烤箱选项高达1000 K，电导率，导热系数，比热，高压条件下的磁性测量和膨胀测量。磁性化学和无机固体化学是Westfälische Wilhelms-Universität自然科学系的两大支柱。除了新固体的合成和结构表征外，结构-性能关系的研究对于全面了解材料起着核心作用。贡献群体在主题上有广泛的基础。这些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。需要PPMS的不同测量模块来处理不同的材料特性。基本的磁化学表征（依赖于温度和场的磁化率和磁化强度测量）将得到最广泛的应用。申请小组在该领域有长期经验，并将与所有合作小组分享这一专业知识。对于磁化学表征的创新扩展，我们希望安装一个高压电池（高达1.3 GPa），用于地球科学样品（Klemmegroup的专业知识）和金属间化合物。在磁测量的同时，还将测量比热数据，以便获得磁相变和结构相变的定量数据。这涉及到金属间稀土化合物、几种有机自由基和来自地球科学以及离子导体的样品。电阻率将用作基本表征（金属和半导体化合物）的补充工具。对于磁性有序化合物，电阻率测量可提供有关有序温度和自旋无序散射的附加信息。此选项将在高达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（泽尔集团的专业知识）。此外，这些测量将进行常规高达400k。其他有趣的项目涉及热膨胀。这是研究金属间化合物的结构相变和磁相变以及离子导体和热电体晶格非调和性的重要参数。新的膨胀计可以解决这些问题。

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.