Amorphous oxide semiconductor (AOS) thin film transistors (TFTs) based on In2O3 have attracted much interest for use as pixel switching elements in next generation active-matrix …
This two-part dissertation-thesis represents a compilation of interdisciplinary studies conducted between materials science and archaeology/cultural heritage as part of the Open Graduate Education Program at …
Calculations of thermodynamic and mechanical properties of defected or non-crystalline bulk structure simulations benefit from the level of accuracy permitted by density functional theory (DFT) …
Silicon is considered one of the promising anode materials owing to its exceptionally high specific capacity (4200 mAh/g) and relatively low discharge voltage (0.4 V). …
This thesis studies the development of piezoelectric thick films ( 5- 100 um) through a hybrid screen print - chemical solution method. The ceramic paste …
The 6000 series (Al-Mg-Si) aluminum alloys are relevant to the automotive industry due to their low density, good formability and cost-effectiveness relative to their 7000 …
Energy storage is a crucial aspect of integrating renewable energy sources in power grids, portable electronic devices and vehicle applications, making the development of efficient …
The increasing demand for materials that can perform at high temperatures beyond the capabilities of Ni-base superalloys has generated interest in refractory metal-based systems (Mo-based …
Calcia-magnesia-alumino-silicate (CMAS) deposits cause spallation and degradation of thermal barrier coatings (TBCs), which are used to insulate and protect metallic components in gas turbine engines. …
Abstract of Densification of Thermal-Barrier Coatings and the Crystallization of Silicate-Salt Mixtures By Ruibang Yi, Sc.M., Brown University, May (2023) Systematic studies have been performed …
This thesis documents a study of the high strain rate deformation behavior of Ni-containing steels of interest to the U.S. Navy for ship structures. A …
The purpose of these experiments is to study the thermal effect of silicon electrode lithium ion battery during high temperature aging. The main reasons for …
Silicon (Si) is widely viewed as a potential negative electrode material for the next generation of high energy density, rechargeable Li ion batteries. Although Si …
Abstract of “Experimental Investigations on Mechanical and Structural Phenomena in Next-Generation Lithium-ion Battery Materials” by Jung Hwi (Juny) Cho, Ph.D., Brown University, May 2022. Throughout …
Exploiting the exceptional mechanical properties of nanostructured carbon for improving wear and erosion resistance of various surfaces is the main objective of the research presented …
Thin film growth is a long-standing research topic in material science research. A better understand the relations of film’s stress with its experiment temperature, deposition …
In polycrystalline materials where transgranular cleavage is the preferred fracture mode, the crystallographic misorientation of fracture planes across grain boundaries can provide resistance to crack …
For non-stoichiometric oxide thin films (e.g. ceria and titania) in constrained geometries the variation in oxygen partial pressures lead to stresses, thus termed compositional stresses. …
Perovskite Solar Cells (PSCs) based on hybrid organic-inorganic halide perovskites (OIHPs) have been under the spotlight due to the unprecedented promise of a low-cost and …
The Solid Electrolyte Interphase (SEI) forms in most Li-ion batteries, but properties such as its formation mechanism are a mystery. The goal of this dissertation …
Abstract of “Investigations on mechanical property - microstructure correlations in CMC Coatings” by Sugeetha Vasudevan, Ph.D., Brown University, May 2016 Carbon nanotubes (CNTs) are being …
Intrinsic stresses which develop during thin film deposition can degrade film performance and lead to the failure of systems and devices which rely on thin …
The ternary solid solution (1-x)Bi1/2(Na0.78K0.22)1/2TiO3 ̶ xBiMg1/2Ti1/2O3 (BNKT-BMT) was investigated for high-strain actuator applications. BNKT-BMT is a Bi1/2Na1/2TiO3 (BNT)-based relaxor ferroelectric which shows promise as …
Advanced high strength steels with a lath martensitic microstructure (MS-AHSS) and tensile strengths > 1 GPa are of interest for automotive applications but are susceptible to …
The low formation energies of metal halide perovskites (MHPs) make it possible to solution-process them near room temperature, but also make them unstable. While significant …
Mo-Si-B alloys are possible candidates for high-temperature applications beyond the capabilities of Ni-based superalloys. Specifically, multiphase Mo-Si-B alloys with a Mo solid solution matrix and …
A thorough understanding of the properties of oxides, including the formation of oxygen vacancy, surface termination, and an interface between oxide and metal, can benefit …
Current aircraft jet engines use nickel-based superalloys in the hot sections. Their operation temperature is about 1050°C. To enhance performance and fuel efficiency, materials that …
The application of high specific-capacity Li anode for all-solid-state batteries with good cycling stability is hindered by the Li dendrite growth during plating and interface …
Due to its excellent mechanical, tribological and biocompatibility properties, polycrystalline diamond is a promising coating material on metallic implants. However, the biological responses of diamond …
Ceramic-matrix composites (CMCs) are being used to replace metallic hot-section components, enabling higher operating temperatures and higher efficiencies in gas-turbine engines used to propel aircraft …
Fast charging of lithium-ion batteries while avoiding lithium metal plating is a central hurdle for widespread adoption of electric vehicles. As the most commonly used …
Sn, which offers large theoretical capacity (994 mAh/g), is a potentially useful anode material in lithium-ion batteries. However, Sn exhibits irreversible capacity loss through mechanical …
Oxide materials have been a focus of recent thermoelectric research due to their thermal and chemical stability as well as cost effectiveness. In this thesis …
Research on ZrB2-SiC based ultra-high temperature ceramic (UHTC) composites has drawn much attention due to their potential for application in future hypersonic vehicles. The aim …
Self-organized pattern formation can be produced by low energy ion bombardment. A continuum theory explains the ion-induced surface morphology evolution in terms of a balance …
The field of photovoltaics has been experiencing a revolution with emergence of perovskite-based solar cells (PSCs). While the swift rise in power conversion efficiencies (PCEs) …
In order to understand the stress behaviors in thin films, three related topics were investigated. First, intrinsic stress generation mechanisms were studied by in-situ stress …
Lithium-rich transition metal oxides (LR-NMC) are attractive cathode materials for lithium-ion batteries due to their high capacity. Their structural instability during cycling remains one of …
Alloys, the most traditional and widely-used materials, are still attracting research interest with their diversity and novel properties. To understand or predict the properties of …
Whiskers are conductive filaments that spontaneously form on Sn-based coatings. They are a critical reliability issue as they can cause short circuits in electronic systems. …
With increasing awareness of lead's harmful effects to the environment and human health, there is a large drive toward lead free products. One of the …