Results 61 to 70 of about 21,239 (224)

Ferroelectricity in ultra-thin perovskite films

, 2005
We report studies of ferroelectricity in ultra-thin perovskite films with realistic electrodes. The results reveal stable ferroelectric states in thin films less than 10 \AA thick with polarization normal to the surface.
Alexie M. Kolpak, Andrew M. Rappe, M. E. Lines, Na Sai   +3 more
core   +1 more source

Compositing Effect Leads to Extraordinary Performance in GeSe‐Based Thermoelectrics

Advanced Functional Materials, EarlyView.
Rhombohedral GeSe is rationally designed with (GeSe)0.9(AgBiTe2)0.1‐1.5 mol.% SnSe, achieving a peak ZT of 1.31 at 623 K. Forming a composite with SnSe establishes interfaces with strong phonon scattering and weak electron scattering. Multiscale defects lead to an ultra‐low lattice thermal conductivity (0.26 W m−1 K−1), approaching the amorphous limit.
Min Zhang, Xiao‐Lei Shi, Siqi Liu, Raza Moshwan, Tianyi Cao, Wenyi Chen, Yongqi Chen, Meng Li, Chenyang Zhang, Nanhai Li, Boxuan Hu, Wanyu Lyu, Wei‐Di Liu, Guihua Tang, Zhi‐Gang Chen   +14 more
wiley   +1 more source

Large ferroelectric polarization in the new double perovskite NaLaMnWO$_{6}$ induced by non-polar instabilities

, 2011
Based on density functional theory calculations and group theoretical analysis, we have studied NaLaMnWO$_{6}$ compound which has been recently synthesized [Phys. Rev.
A. Stroppa, Anderson, Barone, Benedek, Bousquet, Cheong, Dove, Dudarev, Ederer, Etxebarria, Fennie, Fukushima, Gajek, Ghosez, Giovannetti, Glazer, Hur, Ikeda, Imada, J. M. Perez-Mato, Kimura, Kimura, King, King, King-Smith, Knapp, Kresse, Kroumova, Lawes, Levanyuk, Lufaso, Millange, Mostovoy, Neaton, Orobengoa, Perdew, Perez-Mato, Perez-Mato, Picozzi, Ramesh, Resta, Rodriguez-Carvajal, S. Picozzi, Shannon, Spaldin, Stroppa, Stroppa, T. Fukushima, van Aken, Wang, Wang, Woodward   +51 more
core   +1 more source

Integration of Perovskite/Low‐Dimensional Material Heterostructures for Optoelectronics and Artificial Visual Systems

Advanced Functional Materials, EarlyView.
Heterojunctions combining halide perovskites with low‐dimensional materials enhance optoelectronic devices by enabling precise charge control and improving efficiency, stability, and speed. These synergies advance flexible electronics, wearable sensors, and neuromorphic computing, mimicking biological vision for real‐time image analysis and intelligent
Yu‐Jin Du, Junjie Yang, Ziyu Lv, Yongbiao Zhai, Zezhuang Yi, Yuhui Xie, Ming‐Lin Zheng, Xiangyu Ma, Guodong Gong, Yan Wang, Ye Zhou, Su‐Ting Han   +11 more
wiley   +1 more source

The quest for electronic ferroelectricity in organic charge-transfer crystals

, 2019
Organic ferroelectric materials are in demand in the growing field of environmentally friendly, lightweight electronics. Donor-Acceptor charge transfer crystals have been recently proposed as a new class of organic ferroelectrics, which may possess a new
Girlando, Alberto
core  

Enhanced Electromechanical Response in 1D Hybrid Perovskites: Coexistence of Normal and Relaxor Ferroelectric Phases

Advanced Functional Materials, EarlyView.
The dynamic polarization reversal of coexisting normal and relaxor ferroelectrics in 1D TMAPbI₃ (tetramethylammonium, TMA) is deciphered through combined experimental and theoretical approaches. By bridging atomic‐scale motion, macroscopic polarization switching, and depolarization effects, a universal methodology is established to engineer next ...
Chen Xue, Masaru Fujibayashi, Hengming Huang, Chisato Kato, Katsuya Ichihashi, Jun Manabe, Sadafumi Nishihara, Xiao‐Ming Ren, Takayoshi Nakamura   +8 more
wiley   +1 more source

Local Ferroelectricity in SrTiO_3 Thin Films

, 2002
The temperature-dependent polarization of SrTiO_3 thin films is investigated using confocal scanning optical microscopy. A homogeneous out-of-plane and inhomogeneous in-plane ferroelectric phase are identified from images of the linear electrooptic ...
E. Hegenbarth, H. Uwe, H. E. Weaver, H. E. Weaver, Hua Jiang, J. K. Hulm, Jeremy Levy, K. A. Muller, N. A. Pertsev, Oleg Tikhomirov, R. C. Neville, W. J. Burke   +11 more
core   +1 more source

Optical Control of Ferroelectric Imprint in BiFeO3

Advanced Functional Materials, EarlyView.
Above‐bandgap irradiation at room temperature enables on‐demand optical control of defect‐driven built‐in electric fields in BiFeO₃ thin films, fabricated via scalable, chemical spray pyrolysis. These fields, otherwise “frozen‐in,” can cause severe device degradation, including non‐switchable polarization, dead layers near interfaces, and polarization ...
Haoze Zhang, Malur C. Nagashree, Richard F. Webster, Zhipeng Wang, Xiaoran Zheng, Suresh D. Kulkarni, Rajendra B. Venkataramana, Jan Seidel, Pankaj Sharma   +8 more
wiley   +1 more source

Origin of ferroelectricity in the multiferroic barium fluorides BaMF4

, 2006
We present a first principles study of the series of multiferroic barium fluorides with the composition BaMF4, where M is Mn, Fe, Co, or Ni. We discuss trends in the structural, electronic, and magnetic properties, and we show that the ferroelectricity ...
C. J. Bradley, Claude Ederer, E. L. Venturini, M. Eibschütz, Nicola A. Spaldin, P. W. Anderson, R. D. King-Smith, S. M. Shapiro, T. Moriya   +8 more
core   +1 more source

Regulating the Interphase Strain in High‐Entropy Oxide Thin Films – An Approach to Attaining Giant Energy Storage Capability under Moderate Electric Fields

Advanced Functional Materials, EarlyView.
This work demonstrates an interphase strain engineering strategy to regulate capacitive energy storage performance in high‐entropy oxide thin films. Through introducing pyrochlore nanocolumns, the polarization response of perovskite unit cells is strengthened, yielding recoverable energy densities up to 93 J cm−3 with an efficiency of 83% under ...
Hao Luo, Yunlong Sun, Haotian Wen, Richard Webster, Yasuhiro Sakamoto, Zizheng Song, Yating Ran, Chenlu Jiang, Siyuan Zhang, Zibin Chen, Shery L. Y. Chang, Danyang Wang   +11 more
wiley   +1 more source