ACerS Richard M. Fulrath Award Session: Session I
Sponsored by: ACerS
Program Organizers: MS&T Administration, MS&T PCC
Monday 2:30 PM
October 10, 2022
Room: 407
Location: David L. Lawrence Convention Center
Session Chair: Jon-Paul Maria, The Pennsylvania State University
2:30 PM Invited
Elucidation of Dielectric Polarization Mechanism Using THz Spectroscopy: Takuya Hoshina1; 1Tokyo Institute of Technology
Intrinsic dielectric properties of high-permittivity materials such as perovskite oxides are predominantly determined by the ionic polarizations related to the lattice vibrations (phonon). Therefore, it is necessary to measure the complex dielectric permittivity as a function of frequency in THz region to understand the origin of the intrinsic dielectric property. In this presentation, I will introduce THz dielectric spectra of typical dielectric and ferroelectric materials. Recently, we uniquely developed an ellipsometric system for determining THz dielectric functions of high-permittivity materials directly. We have been evaluating the complex permittivity of various materials using this system, and analyzing the vibration and diffusion of ions in solids with the aid of theoretical calculations. In addition to the polarization mechanism of typical perovskite-type oxides, I will introduce cation / anion substitution effects, size effect, design of novel materials, and so on.
3:10 PM Invited
Material Development for High Performance and Miniaturization of Multilayer Ceramic Capacitors by Using Sn: Shoichiro Suzuki1; 1Murata Manufacturing Co., Ltd.
Miniaturized high-capacitance multilayer ceramic capacitors (MLCCs) have played an important role in improving the performance of mobile devices and automobiles. This presentation shows results that solid solutions of BaTiO3 ferroelectric ceramics containing Sn2+ ions have been synthesized by solid state reaction with Ca2+ co-doping and shown the phase transition temperature of 155 °C. In addition, this presentation also reviews that various elements are alloyed to the nickel inner electrodes in MLCCs to investigate the effect on insulation resistance degradation and capacity. Our finding makes a significant contribution to the further performance and miniaturization of these MLCCs possible.
3:30 PM Invited
Additive Manufacturing of Ceramics Using Preceramic Polymers: Tobias Schaedler1; Phuong Bui1; Kayleigh Porter1; Ekaterina Stonkevitch1; Erin Wernick1; Alex Yu1; Mark O’Masta1; 1HRL Laboratories, LLC
This talk reviews the different approaches for the additive manufacturing of ceramics and discusses how preceramic polymers can offer new opportunities from high temperature applications to microelectronics. Siloxane and carbosilane organo-silicon polymers will convert to Si(O)C upon pyrolysis. We have developed UV curable variants for use with liquid-vat type 3D printers as well as shear-thickening variants for direct ink writing. Suspending fibers or particles in the resin before printing results in a two-phase microstructure in the pyrolyzed part. This enables additive manufacturing of SiC based ceramic matrix composites that exhibit high strength at 1600°C. Furthermore, the low viscosity of preceramic resins is advantageous for additive micro-manufacturing of parts on the centimeter scale with 10 µm sized features. We demonstrate thousands of curved holes (i.e., vias) – printed directly into the ceramic – that can be subsequently metallized to provide electric pathways. This technology enables unprecedented via routing and packaging options for the 3D integration of microelectronic subsystems.
3:50 PM Break
4:10 PM Invited
Development of Ultra-thin Piezoelectric Type Loudspeaker for Mobile Phones: Masatake Takahashi1; 1NEC Corporation
Applications of piezoelectric transducers are widely spread in Information and Communication Technology region. We focused on developing an ultra-thin loudspeaker with high sound quality and high mechanical toughness to realize the world’s thinnest mobile phone, 9.8mm in thickness, in 2008. In this presentation, I will review the technologies we developed for it and also introduce other challenges to explore more applications of piezoelectric devices.
4:30 PM Invited
Advancing Solid State Reaction Science Through In Situ X-ray Diffraction and Processing Control: Jacob Jones1; J. Corrado Harper1; Leah Bellcase1; Rachel Broughton1; Jennifer Forrester1; 1North Carolina State University
Our ability to study and advance the science of solid state reactions relies on the tools and techniques with which we can monitor them. In situ X-ray diffraction (XRD) during the solid state reaction is a powerful technique that our research team has used for over a decade to understand the fundamental mechanisms underpinning the synthesis of perovskite oxides from starting oxides and carbonates. This presentation will highlight several examples of fundamental insight garnered from such measurements in important and emerging dielectric and ferroelectric materials including Na0.5Bi0.5TiO3 (NBT), NBT-BaTiO3, K0.5Na0.5NbO3, and BiFeO3-(Ba,Sr)TiO3. In NBT, for example, we find that Bi2O3 serves as a host particle that transforms into the NBT product, a parallel to how TiO2 converts to perovskite BaTiO3. In the other systems, we show important particle-particle interaction mechanisms that occur during and influence the formation of the perovskite phase.