Results 111 to 120 of about 140,570 (332)

Ultra-high permittivity BaTiO3 (ε = 230) on Al2O3/AlGaN/GaN MISHEMTs for field-management in high-voltage RF applications [PDF]

APL Electronic Devices
We report ultra-high permittivity of RF sputtered BaTiO3 films on AlGaN/GaN Metal–Insulator–Semiconductor High-Electron Mobility Transistors (MISHEMTs) via high temperature sputtering and subsequent annealing in nitrogen.
Kyle J. Liddy, Weisong Wang, Stefan Nikodemski, Chris Chae, Kevin D. Leedy, Jean-Pierre Bega, Nolan S. Hendricks, Elizabeth A. Sowers, Ahmad E. Islam, Jinwoo Hwang, Siddharth Rajan, Andrew J. Green   +11 more
doaj   +1 more source

Asymmetry of the Ferroelectric Phase Transition in BaTiO3

Advanced Materials, EarlyView.
Phase transitions are typically assumed to behave identically in forward and reverse. This work shows that in the ferroelectric material barium titanate this is not true: heating drives an abrupt, first‐order jump, while cooling gives a smooth, continuous change.
Asaf Hershkovitz, Elangovan Hemaprabha, Rajesh Mandal, Pravin Kavle, Jamil Tanus, Maya Barzilay, Ching‐Che Lin, David Spirito, Semën Gorfman, Bo Wang, Ignacio J. Villar‐García, Neus Domingo, Long‐Qing Chen, Lane W. Martin, Yachin Ivry   +14 more
wiley   +1 more source

Ultralow‐Frequency Epsilon‐Near‐Zero States in 3D‐Printed High‐Entropy Alloy Metacomposites for Ultra‐Thin Perfect RF Absorption

Advanced Materials, EarlyView.
Rozanov causality limit—a compulsive proportional thickness‐wavelength relationship (nd ∝ λ)—makes it challenging to develop perfect absorption with both thin thickness and low frequency. Herein, a cocktail effect in high‐entropy alloys (HEA) is crucially utilized for lowering plasma frequency to achieve epsilon‐near‐zero states, which finally enables ...
Peitao Xie, Haikun Wu, Zhenxiang Cheng, Mingxiang Liu, Yuan Liu, Weikong Pang, Runhua Fan, Yao Liu   +7 more
wiley   +1 more source

Metamaterial Antennas Enhance MRI of the Eye and Occipital Brain

Advanced Materials, EarlyView.
A radiofrequency antenna platform comprising planar and bend configurations is developed, incorporating structurally integrated epsilon‐negative metamaterial unit cells to enhance MRI. These antennas enable high‐resolution in vivo human MRI of the eye, orbit, and occipital brain. Comprehensive validation, including simulations, phantom experiments, SAR,
Nandita Saha, Bilguun Nurzed, Mostafa Berangi, Andre Kuehne, Helmar Waiczies, Igor Fabian Tellez Ceja, Xiang Hu, Thomas Gladytz, Lisa Krenz, Dave Huebler, Beate Endemann, Claudia Brockmann, Ebba Beller, Oliver Stachs, Thoralf Niendorf   +14 more
wiley   +1 more source

Dielectric Hybrid Optimization Model Based on Crack Damage in Semi-Rigid Base Course

Buildings
To accurately predict the relative permittivity of cement-stabilized base materials, a study on the dielectric mixing model for cracked base materials was conducted.
Zhiyong Huang, Guoyuan Xu, Huayang Yu, Xuetang Xiong, Bo Zang   +4 more
doaj   +1 more source

Modeling the Effect of Material Viscoelasticity on the Dielectric Permittivity of Deformed Elastomers. [PDF]

Polymers (Basel), 2023
Zheng X, Zhou J.
europepmc   +1 more source

A Solid State Zwitterionic Plastic Crystal With High Static Dielectric Constant

Advanced Materials, EarlyView.
Developing solid high dielectric constant materials has been a research focus in the energy storage field. In this research, we discovered a zwitterion with a plastic crystal phase. Due to the short‐range degree of freedom of the dipole moment for this zwitterion, a relatively high static dielectric constant has been achieved in its solid state ...
Zitan Huang, Yifan Liu, Tiago Outerelo Corvo, Ain Uddin, Michelle L. Lehmann, Tomonori Saito, Valentino R. Cooper, Ralph H. Colby   +7 more
wiley   +1 more source

Simulations of high permittivity materials for 7 T neuroimaging and evaluation of a new barium titanate‐based dielectric [PDF]

, 2012
Wouter M. Teeuwisse, Wyger Brink, K. Haines, Andrew Webb   +3 more
openalex   +1 more source

Machine learning and atomistic origin of high dielectric permittivity in oxides. [PDF]

Sci Rep, 2023
Shimano Y, Kutana A, Asahi R.
europepmc   +1 more source

Topology‐Optimized Stretchable Piezoelectric Sensors With Tailored Liquid‐Metal Circuits for Anisotropic Stress‐Adaptive Motion Monitoring

Advanced Materials, EarlyView.
Schematic showing the leveraging of topology optimization, the printing of a tailored eutectic gallium‐indium liquid alloy electrode, and porous ceramic engineering to simultaneously enhance mechanical durability, stretchability, and sensing sensitivity to produce a highly deformable and stretchable sensor capable of monitoring complex and anisotropic ...
Hanmin Zeng, Qianqian Xu, Jianxun Zhang, Peiqiong Zhou, Jiachen Zhang, Jinlan Li, Senfeng Zhao, Kechao Zhou, Dou Zhang, Chris Bowen, Yan Zhang   +10 more
wiley   +1 more source