Clive A. Randall
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View article: A far from equilibrium state developed from pulse poling for high performance piezoelectric transducers
A far from equilibrium state developed from pulse poling for high performance piezoelectric transducers Open
Creating a piezoelectric or pyroelectric material from a ferroelectric material requires aligning its ferroelectric domains to achieve a remanent polarization. This complex process involves nucleating/growing domain structures and inducing…
View article: Non‐equilibrium thermodynamics and kinetics of the sintering process: A relaxation model describing cold sintering
Non‐equilibrium thermodynamics and kinetics of the sintering process: A relaxation model describing cold sintering Open
Sintering is a complex process that involves a number of competing mechanisms. There are many types of sintering processes. The most recently introduced is cold sintering, which is based largely on a chemo‐mechanical pressure solution mech…
View article: A comparative consideration of the link between poling procedure, induced damage, and piezoelectric response in perovskite ferroelectrics
A comparative consideration of the link between poling procedure, induced damage, and piezoelectric response in perovskite ferroelectrics Open
There has been much interest in recent years in improving Direct Current Poling (DCP) for piezoelectric materials. Some of the more promising substitutes include Alternating Current Poling (ACP), Water Quench Poling (WQP), and ACP with Fie…
View article: Thermal analysis of base metal electrode multilayer ceramic capacitors
Thermal analysis of base metal electrode multilayer ceramic capacitors Open
Multilayer ceramic capacitors (MLCCs) are a mainstay in modern electronics; they are utilized in consumer electronics, medical equipment, military devices, and electric vehicles, among others. As their range of usage increases, it is cruci…
View article: Impact of thermal crosstalk on dependent failure rates of multilayer ceramic capacitors undergoing lifetime testing
Impact of thermal crosstalk on dependent failure rates of multilayer ceramic capacitors undergoing lifetime testing Open
Several research studies have investigated the degradation of BaTiO3-based dielectric capacitor materials, focusing on the impact of composition, defect chemistry, and microstructural design to limit the electromigration of oxygen vacancie…
View article: Cold sintering of geopolymer powders
Cold sintering of geopolymer powders Open
Geopolymers (GP) represent a promising class of inorganic materials with diverse applications due to their properties, including high temperature resistance and strong interfacial bonding ability. They are produced through alkali activatio…
View article: Using percolation to design ZnO composites with hBN modified grain boundaries to obtain varistor-like behavior
Using percolation to design ZnO composites with hBN modified grain boundaries to obtain varistor-like behavior Open
Conventional varistors rely on the formation of a Double Schottky Barrier within the intergranular region of ZnO via acceptor doping and a Bi2O3 phase. This work has been able to yield varistor-like behavior via cold sintered ZnO composite…
View article: Impact of volatility, non‐stoichiometry, and atmospheres in perovskite piezoelectric and dielectric materials
Impact of volatility, non‐stoichiometry, and atmospheres in perovskite piezoelectric and dielectric materials Open
Defect chemistry that results in the thermal processing of dielectric and piezoelectric films, crystals and ceramics ultimately controls the properties and long‐term performance of materials and devices. This paper reviews several thermoch…
View article: Dielectric properties and microstructure of BaTiO<sub>3</sub>-PTFE composites via cold sintering process
Dielectric properties and microstructure of BaTiO<sub>3</sub>-PTFE composites via cold sintering process Open
The cold sintering process is capable of densifying ceramics and metal powders with other phases into composite materials without inducing chemical reactions between the constituent phases or causing the decomposition of any phases. In thi…
View article: Controlling surface chemistry in cold sintering to advance battery materials
Controlling surface chemistry in cold sintering to advance battery materials Open
Cold sintering is a recently introduced densification method that is of interest due to the lower energy used in the process, the ability to densify metastable materials, the ability to integrate materials to develop unique composites, and…
View article: Bimodal grain sized barium titanate dielectrics enabled under the cold sintering process
Bimodal grain sized barium titanate dielectrics enabled under the cold sintering process Open
In barium titanate (BaTiO3) the relative permittivity varies as a function of grain size due to the influence of various sizes and scaling effects. The cold sintering process (CSP) has been applied to sinter nanocrystalline BaTiO3 (<200 nm…
View article: Erratum: “Improved prediction for failure time of multilayer ceramic capacitors (MLCCs): A physics-based machine learning approach” [APL Mach. Learn. 1, 036107 (2023)]
Erratum: “Improved prediction for failure time of multilayer ceramic capacitors (MLCCs): A physics-based machine learning approach” [APL Mach. Learn. 1, 036107 (2023)] Open
The numerical value for the Eyring model prediction for 375 V at 135 ○ C in Fig. 3, along with the correlated error values in Table III in the original paper, 1 has been corrected due to a miscalculation for this data point. FIG. 3.Compari…
View article: Electrical Degradation in Dielectric and Piezoelectric Oxides: Review of Defect Chemistry and Associated Characterization Techniques
Electrical Degradation in Dielectric and Piezoelectric Oxides: Review of Defect Chemistry and Associated Characterization Techniques Open
The properties of dielectric and piezoelectric oxides are determined by their processing history, crystal structure, chemical composition, microstructure, dopants (or defect) distribution, and defect kinetics. These materials are essential…
View article: Conductivity of cold sintered diphasic composites containing a ceramic active material and a solid-state electrolyte or carbon for all solid-state batteries
Conductivity of cold sintered diphasic composites containing a ceramic active material and a solid-state electrolyte or carbon for all solid-state batteries Open
Low temperature sintering enables dense composites of ceramic active materials and conductive agents. Conductivity and microstructure of composites is characterized.
View article: Cold sintering of nickel manganese oxide for thermistor fabrication
Cold sintering of nickel manganese oxide for thermistor fabrication Open
The cold sintering process densified NiMn 2 O 4 , achieving high densities while maintaining critical functional properties, therefore presenting a sustainable and energy-efficient alternative to conventional sintering techniques for NTC t…
View article: Mental Health in the Workplace: Strategies for Promoting Employee Well-Being
Mental Health in the Workplace: Strategies for Promoting Employee Well-Being Open
This journal article explores the critical issue of mental health in the workplace and presents strategies to promote employee well-being. With the increasing recognition of the impact of workplace stress and mental health challenges on pr…
View article: Quality assessment and lifetime prediction of base metal electrode multilayer ceramic capacitors: Challenges and opportunities
Quality assessment and lifetime prediction of base metal electrode multilayer ceramic capacitors: Challenges and opportunities Open
Base metal electrode (BME) multilayer ceramic capacitors (MLCCs) are widely used in aerospace, medical, military, and communication applications, emphasizing the need for high reliability. The ongoing advancements in BaTiO3-based MLCC tech…
View article: BaTiO<sub>3</sub>-based composites provide new opportunities enabled by the cold sintering process
BaTiO<sub>3</sub>-based composites provide new opportunities enabled by the cold sintering process Open
This paper reviews the synthesis of BaTiO 3 -based ceramic and composites through the cold sintering process. Cold sintering is a densification process that works with a low-temperature mechanism known as pressure solution creep. This prov…
View article: Improved prediction for failure time of multilayer ceramic capacitors (MLCCs): A physics-based machine learning approach
Improved prediction for failure time of multilayer ceramic capacitors (MLCCs): A physics-based machine learning approach Open
Multilayer ceramic capacitors (MLCC) play a vital role in electronic systems, and their reliability is of critical importance. The ongoing advancement in MLCC manufacturing has improved capacitive volumetric density for both low and high v…
View article: Impact of PTFE particle size in designing BaTiO<sub>3</sub> dielectric composites under the cold sintering process
Impact of PTFE particle size in designing BaTiO<sub>3</sub> dielectric composites under the cold sintering process Open
The Cold Sintering Process (CSP) can provide opportunities to fabricate high-performance BaTiO 3 dielectric composites with polymer materials that are typically difficult to impossible to co-process under a conventional sintering process. …
View article: Sodium molybdate‐hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates
Sodium molybdate‐hexagonal boron nitride composites enabled by cold sintering for microwave dielectric substrates Open
To fulfill the demands of more bandwidth in 5G and 6G communication technology, new dielectric substrates that can be co‐fired into packages and devices that have low dielectric loss and improved thermal conductivity are desired. The motiv…
View article: Wake up and retention in zinc magnesium oxide ferroelectric films
Wake up and retention in zinc magnesium oxide ferroelectric films Open
Zn0.64Mg0.36O (ZMO) is a newly discovered ferroelectric oxide with the wurtzite structure. Epitaxial Zn0.64Mg0.36O films from 0.036 to 0.5 μm in thickness are grown on Pt/sapphire with the crystallographic c-axis out of plane. At room temp…
View article: Techno-environmental analysis of material substitution in thermoelectric modules: non-oxide (bismuth telluride alloys) vs. oxide-based (lanthanum-doped strontium titanate and calcium cobaltite) materials
Techno-environmental analysis of material substitution in thermoelectric modules: non-oxide (bismuth telluride alloys) vs. oxide-based (lanthanum-doped strontium titanate and calcium cobaltite) materials Open
Due to high toxicity, thermal instability at high temperature, low availability, and the high cost of raw metallic alloys such as Bi2Te3 for thermoelectric (TE) applications, there has been a drive to develop earth-abundant and eco-benign …