The hafnate perovskites PbHfO (antiferroelectric) and SrHfO ("potential" ferroelectric) are studied as epitaxial thin films on SrTiO (001) substrates with the added opportunity of observing a morphotropic phase boundary (MPB) in the Pb Sr HfO system. The resulting (240)-oriented PbHfO (Pba2) films exhibited antiferroelectric switching with a saturation polarization ≈53 µC cm at 1.6 MV cm , weak-field dielectric constant ≈186 at 298 K, and an antiferroelectric-to-paraelectric phase transition at ≈518 K. (002)-oriented SrHfO films exhibited neither ferroelectric behavior nor evidence of a polar P4mm phase . Instead, the SrHfO films exhibited a weak-field dielectric constant ≈25 at 298 K and no signs of a structural transition to a polar phase as a function of temperature (77-623 K) and electric field (-3 to 3 MV cm ). While the lack of ferroelectric order in SrHfO removes the potential for MPB, structural and property evolution of the Pb Sr HfO (0 ≤ x < 1) system is explored. Strontium alloying increased the electric-breakdown strength (E ) and decreased hysteresis loss, thus enhancing the capacitive energy storage density (U ) and efficiency (η). The composition, Pb Sr HfO produced the best combination of E = 5.12 ± 0.5 MV cm , U = 77 ± 5 J cm , and η = 97 ± 2%, well out-performing PbHfO and other antiferroelectric oxides.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1002/adma.202105967 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Multifunctional electrospun nanofiber films of polyacrylonitrile and polyvinyl alcohol incorporating rhamnose and therapeutic agents for enhanced healing of infected burn wounds.
J Biomater Sci Polym Ed
January 2025
Department of Microbiology, University of Central Punjab, Lahore, Pakistan.
Infected burn wounds present significant clinical challenges due to delayed healing and risk of infection, necessitating advanced treatments that offer both antimicrobial and regenerative properties. This study aimed to develop and evaluate multifunctional electrospun nanofiber films incorporating rhamnose (as an angiogenic agent) and therapeutic agents, namely fluticasone, mupirocin, ciprofloxacin, and silver sulfadiazine, for the enhanced healing of infected burn wounds. Nanofibers containing rhamnose, polyacrylonitrile, polyvinyl alcohol and therapeutic agents were fabricated electrospinning.
View Article and Find Full Text PDFChiral nematic cellulose nanocrystal films: Sucrose modulation for structural color and dynamic behavior.
Int J Biol Macromol
January 2025
Department of Chemical and Biological Engineering, University of Saskatchewan, 57 Campus Drive, Saskatoon, SK S7N 5A9, Canada. Electronic address:
This study explores the effect of sucrose addition on the properties of chiral nematic cellulose nanocrystal (CNC) films for potential food industry applications, including biodegradable packaging and food coloring. The addition of sucrose altered the films' structural color, shifting from blue in pure CNC films to aqua blue, green, yellow-green, and red with increasing sucrose concentrations (up to 21 %). Surface analysis revealed a reduction in contact angle from 96° to 48° due to sucrose's hydrophilic nature and smoother film surfaces.
View Article and Find Full Text PDFRoom-temperature and recyclable preparation of cellulose nanofibers using deep eutectic solvents for multifunctional sensor applications.
Int J Biol Macromol
January 2025
State Key Lab for Hubei New Textile Materials and Advanced Processing Technology, College of Materials Science & Engineering, College of Textile Science & Engineering, Wuhan Textile University, 430200 Wuhan, China. Electronic address:
Cellulose nanofibers (CNFs) have gained increasing attention due to their robust mechanical properties, favorable biocompatibility, and facile surface modification. However, green and recyclable CNF production remains challenging. Herein, a green, low-cost and room-temperature strategy was developed to exfoliate CNFs using deep eutectic solvents.
View Article and Find Full Text PDFCharacterization of gelatin-based composite films loaded with polysaccharide and carbon dots from Stropharia rugosoannulata and their application in pork fresh-keeping.
Int J Biol Macromol
January 2025
Faculty of Food Science and Engineering, Kunming University of Science and Technology, Kunming 650500, China. Electronic address:
In this study, bio-based composite films with enhanced barrier, mechanical, antioxidant and antimicrobial properties were prepared by incorporating Stropharia rugosoannulata waste (SP)-derived polysaccharides (SPP) and carbon dots (SPCDs) as an active substance into gelatin (GEL) matrix, which were evaluated for their potential application in pork preservation. The effects of varying concentrations of SPCDs on the morphology, microstructure, and overall performance of the films were systematically investigated. The findings demonstrated that the addition of SPCDs to the GEL/SPP matrix significantly improved the mechanical strength, water vapor permeability, and ultraviolet light blocking ability of the composite films.
View Article and Find Full Text PDFDynamically mechanochromic, fluorescence-responsive, and underwater sensing cellulose nanocrystal-based conductive elastomers.
Int J Biol Macromol
January 2025
Jiangsu Co-Innovation Center for Efficient Processing and Utilization of Forest Resources, Jiangsu Provincial Key Lab Pulp & Paper Science and Technology, Nanjing Forestry University, Nanjing 210037, PR China. Electronic address:
Utilizing cellulose nanocrystals (CNCs) to mimic biological skin capable of converting external stimuli into optical and electrical signals represents a significant advancement in the development of advanced photonic materials. However, traditional CNC photonic materials typically exhibit static and singular optical properties, with their structural color and mechanical performance being susceptible to water molecules, thereby limiting their practical applications. In this study, CNC-based conductive elastomers with dynamic mechanochromism, fluorescence responsiveness, and enhanced water resistance were developed by incorporating carbon quantum dots (C QDs) and hydrophobic deep eutectic solvents (HDES) into CNC photonic films via an in-situ swelling-photopolymerization method.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!