IRG 2

Complex Metal Oxides

IRG 2 Leaders:

paul evans

Paul Evans
1105 Engineering Research Building
1500 Engineering Dr
Madison, WI 53706
608-265-6773
pgevans@wisc.edu

Jordan R. Schmidt 
Department of Chemistry
1101 University Ave
Madison, WI 53706
608-262-2996
schmidt@chem.wisc.edu

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Complex metal oxides are a diverse and highly versatile class of materials that can exhibit scientifically and technologically important behaviors ranging from magnetism to piezoelectricity.  New technologies and new fields of applications can be realized by expanding the scope of available ionic compositions and increasing the geometric complexity of nanostructures formed from crystalline oxide materials. IRG 2 focuses on probing the synthesis of oxides, increasing the range of available oxide compositions, and forming unique nanostructures – directions that are each enabled by use of novel transformations from the amorphous to crystalline form. This process of solid phase epitaxy, or SPE, allows the crystallization of materials that cannot be made through conventional processing techniques and provides the freedom to develop new materials and explore new properties.

 

IRG 2 Highlights

  • (2020) Solid-Phase Crystallization Produces Oxide Buffer Layers Lattice-Matched to Semiconductors

    Engineers currently lack good substrate materials on which to grow thin films of materials like GaN with few defects. These layers are needed in applications like high-power transistors and solid-state lighting. Available bulk crystals have the wrong crystal structure or the wrong distance between the atoms. The Wisconsin MRSEC has developed a buffer layer material and related synthesis method that promises to alleviate the substrate problem.

  • (2020) Solid-phase Epitaxy Produces Magnetic Oxides with Novel Magnetic Properties

    The Wisconsin MRSEC has created thin films of a fascinating magnetic material, Pr2Ir2O7, in which the magnetic moments are frustrated: No matter how they are arranged, some of the moments are always fighting to change their direction, like two bar magnets with their north poles shoved together. Frustration creates a rich landscape for discovery and manipulation of new magnetic effects and of electronic phenomena linked to magnetism.

  • (2020) In Situ Synchrotron Radiation Instrumentation for Challenging Problems in Oxide Crystallization

    Researchers at the Wisconsin MRSEC have developed a new instrument using very bright synchrotron x-ray beams to watch nanoscale crystals as they grow. The system has a unique design that allows the crystals to grow in vacuum while keeping the x-ray lenses and the x-ray beam in air but bringing them very close to the crystal. Wisconsin MRSEC researchers are using this new instrument to learn about solid phase epitaxy, a process based on the growth of ordered crystals from a disordered amorphous solid, which is capable of creating new materials for applications in electronics, optics, sensors, and quantum information.

  • Solid-Phase Epitaxy of Atomic Layer Deposited PrAlO3 Films Presented at APS by MRSEC Graduate Student

    Yajin Chen presented her work on the use of solid-phase epitaxy to create epitaxial complex-oxide interfaces that have promising electronic properties at the APS March Meeting 2019 in Boston, MA.

  • MRSEC Postdoc, Peng Zuo, Gives Presentation at ICCGE19

    Peng Zuo, a postdoc working in the MRSEC IRG 2, presented his group’s work on the system of PrAlO3/SrTiO3 created by solid phase epitaxy at the International Conference on Crystal Growth and Epitaxy (ICCGE-19) in …

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