Results 91 to 100 of about 18,116 (135)

Dislocation plasticity in c$c$‐axis nanopillar compression of wurtzite ceramics: A study using neural network potentials

Journal of the American Ceramic Society, Volume 108, Issue 6, June 2025.
Abstract Ceramics typically exhibit brittle characteristics at room temperature. However, under high compressive stress conditions, such as during nanoindentation or compression tests on nanopillars, these materials can reach the necessary shear stress for dislocation nucleation and glide before fracture occurs.
Shihao Zhang, Shigenobu Ogata
wiley   +1 more source

Review of phase equilibria of the system BaO–TiO2

Journal of the American Ceramic Society, Volume 108, Issue 6, June 2025.
Abstract The system BaO–TiO2 plays a significant role in the field of functional ceramics owing to the existence of multiple dielectric, piezoelectric, and ferroelectric intermediate phases. Although the first binary phase diagram for this system was introduced in 1951, more than 70 years passed before construction of a complete phase diagram.
Tasmia Zaman, Pramod Koshy, John E. Daniels, Charles Christopher Sorrell   +3 more
wiley   +1 more source

Weakly‐coupled barium titanate stannate‐based relaxors as energy storage materials

Journal of the American Ceramic Society, Volume 108, Issue 6, June 2025.
This study explores the development of lead‐free relaxor ferroelectrics, specifically (1−x)Ba(Ti0.93Sn0.07)O3−xBiYO3 (BTS7‐BY) solid solutions, which offer potential for high‐efficiency energy storage applications. By adjusting the BiYO3 content, we achieved a transition from ferroelectric to weakly‐coupled relaxor behavior, resulting in improved ...
Eva Kröll, Lara Devecioglu, Andrei N. Salak, Lukas Piotrowsky, Vladimir V. Shvartsman, Doru C. Lupascu   +5 more
wiley   +1 more source

Enhancing dielectric properties of BaZrTiO3 via controlled anatase/rutile core‐shell TiO2

Journal of the American Ceramic Society, Volume 108, Issue 6, June 2025.
Abstract Numerous studies are being conducted to develop novel materials capable of achieving ultrahigh dielectric constants. In this research, we focused on controlling oxygen vacancies and grain growth in dielectric materials to enhance their dielectric properties.
Wolil Nam, Ransae Cheon, Jihye Seo, Seokha Heo, Seungchan Cho, Giyoung Byun, Yangdo Kim, Moonhee Choi   +7 more
wiley   +1 more source

Probing the Structure and Dynamics of the [NH4]M(HCO2)3 Ferroelectric Phases: Dielectric Relaxation through Orientational Disorder†

Chinese Journal of Chemistry, Volume 43, Issue 10, Page 1190-1198, 15 May 2025.
The polar [NH4]M(HCO2)3 frameworks exhibit dielectric relaxation due to orientational disorder of the NH4, as identified by a multi‐technique examination of their structure and dynamics. Comprehensive Summary Neutron diffraction studies of the low‐temperature relaxor ferroelectric phases of [NH4]M(HCO2)3, where M = Mn2+ and Zn2+, show that a third of ...
Thomas J. Hitchings, Helen M. Wickins, Lydia G. Burley, Silvia C. Capelli, Franz Demmel, Anthony E. Phillips, Paul Hodgkinson, Paul J. Saines   +7 more
wiley   +1 more source

Dielectric properties of the ferroelectric ceramics [PDF]

Journal of Physics D: Applied Physics, 1998
The temperature and frequency dependences of the permittivity , the dielectric loss factor and the resistance R of the ceramic Ti in the interval 100-800C were studied. A ferroelectric phase transition at temperature C was observed. Hysteresis loops typical for ceramic ferroelectrics were observed. Relaxation maxima of the dielectric loss factor in the
I. S. Ivanov, Ch P Carapanov, S. P. Yordanov   +2 more
openaire   +1 more source

Fracture behavior of ferroelectric ceramics

SPIE Proceedings, 1999
Piezoelectric actuators are key components in many smart structures applications. Long term reliability of these actuators becomes increasingly important as research makes the transition to commercial applications. Fracture toughness is a material parameter that measures a material's resistance to crack propagation.
Chen, Wei, Lupascu, Doru C., Lynch, Christopher S.   +2 more
openaire   +2 more sources

Ferroelectric and dielectric properties of ferrite-ferroelectric ceramic composites

Journal of Applied Physics, 2013
Particulate composites of ferrite and ferroelectric phases with xNiFe2O4 (NF) and (1 − x)Pb0.988(Zr0.52Ti0.48)0.976Nb0.024O3 (where x = 2, 10, 20, 30, 50, 70, and 100 wt. %) were prepared in situ by sol-gel method. The presence of a diphase composition was confirmed by X-ray diffraction while the microstructure of the composites was studied by scanning
Ciomaga, Cristina Elena, Neagu, Alexandra Maria, Pop, Mihai Valentin, Airimioaei, Mirela, Tascu, Sorin, Schileo, Giorgio, Galassi, Carmen, Mitoseriu, Liliana   +15 more
openaire   +2 more sources

Viscoplastic models for ferroelectric ceramics [PDF]

Journal of the European Ceramic Society, 2005
Nonlinear hysteretic phenomena in polycrystalline ferroelectric ceramics are simulated using viscoplastic (rate-dependent) models without a switching condition. Viscoplastic models describe the domain structure evolution effectively: in terms of rate equations for the volume fractions of orientation variants.
A. Yu. Belov, Wolfgang S. Kreher
openaire   +1 more source

Strong ultrasonic microwaves in ferroelectric ceramics [PDF]

1996 IEEE Ultrasonics Symposium. Proceedings, 1998
It is well known that ferroelectric materials have piezoelectric properties which allow the transformation of electrical signals into mechanical signals and vice versa. The transducer action normally is restricted to frequencies up to the mechanical resonance frequency of the sample.
openaire   +3 more sources