Novel (Multi-) Caloric Phenomena in Complex-Oxide Materials
Abstract
This program will explore the potential for novel (multi-)caloric phenomena in complex-oxide, ferroelectric materials and multi-material heterostructures wherein cross-coupled function can give rise to exotic effects. As part of this work, a framework of fundamental understanding about some of the least studied caloric effects including studies of stress-induced piezocaloric effects (sometimes called elastocaloric effects) and the potential for multicaloric response from single- and multi-material heterostructures will be developed. Building from the PIÕs study of the physics of electrothermal responses in complex oxides, the goals of the work will be achieved by implementation of a combined synthesis, processing, characterization, and materials testing approach. It will answer questions about how different ferroic order parameters (i.e., ferroelasticity, ferroelectricity, and/or ferromagnetism) provide for stimuli-induced entropic changes and how can we design materials/heterostructures with large effects in this regard? The specific objects of the program include: ¥ Fundamental understanding of piezocaloric effects Ð Leverage thin-film synthesis to create model and free-standing materials (with controlled order parameters, phase transformations, domain structures, interfaces, etc.) capable of unraveling piezocaloric physics. ¥ Measurement of piezocaloric effects Ð Leverage expertise in the measurement of electrothermal effects in thin films to probe stress-induced temperature changes in thin-film materials thereby opening the door for unprecedented understanding. ¥ Multicaloric effects in single materials Ð Explore the physics of multicaloric effects in single-material heterostructures wherein both electrocaloric and piezocaloric effects are possible and coupled. ¥ Multi-material, magneto-electro-piezo-caloric effects Ð Develop novel caloric effects in multi-material heterostructures wherein single (or multiple) applied stimuli drive changes in multiple, strongly coupled order parameters thus producing large caloric effects at any temperature. The program addresses such challenges by incorporating the PIÕs expertise in creating and characterizing epitaxial oxide thin-film heterostructures into a multi-faceted study of caloric response and physics. In turn, the program includes pioneering experimental studies of piezocaloric and novel magneto-electro-caloric effects in complex-oxide thin-film ferroelectric and multiferroic structure. The intellectual merit of this program includes the development of a framework in which to generate fundamental understanding of the synthesis and processing of complex functional materials, to expand our understanding of underdeveloped caloric phenomena, to create new versions of high-performance functional materials, the realization of exotic multicaloric response in coupled order parameter systems, etc. The proposed research addresses Army efforts to assure aspects of power projection superiority, informational supremacy, and lethality and protection superiority. Advances in this program will provide a key component to advanced nanoelectronics and night vision systems in the ability to efficiently and quietly cool these systems with a compact cooling system. Publically Releasable
Document Details
- Document Type
- DoD Grant Award
- Publication Date
- Jun 25, 2021
- Source ID
- W911NF2110118
Entities
People
- Lane W Martin
Organizations
- Army Contracting Command
- United States Army
- University of California, Berkeley