Results 71 to 80 of about 19,560 (246)

Sol-gel processing and physic-chemical characterization of La and Ce doped lead titanate ceramics

MATEC Web of Conferences, 2013
PbTiO3 (PT) sol gel processed powders doped with lanthanum (PLT14) and cerium (PLCexT14, x = 1; 3; 6; 10) were characterized by XRD and Raman spectroscopy. The samples crystallize in a pure perovskite phase at temperatures smaller than those reported for
Guaaybess Y., Maanan M., Adhiri R., Moussetad M., El Mesbahi A., Sayouri S., Zarhouni L.   +6 more
doaj   +1 more source

Estudio químico-cuántico de los defectos producidos por las vacancias de oxígeno en los cristales de Titanato de plomo PbTiO3

Ingenius: Revista de Ciencia y Tecnología, 2008
Estudio químico-cuántico de los defectos producidos por las vacancias de oxígeno en los cristales de Titanato de plomo ...
Arvids Stashans, Sheyla Serrano, P. Medina   +2 more
doaj   +1 more source

Tunable Negative Thermal Expansion in Fe/Cr‐Substituted Nd2Co17 Compounds via Magnetoelastic Coupling

Advanced Science, EarlyView.
This study achieves anisotropic thermal expansion tuning in Nd2(Co1‐xFex)17‐yCry compounds via a magnetoelastic strategy. Variable‐temperature synchrotron X‐ray diffraction reveals that increased Fe content induces switchable lattice responses. Compositional control reduces the volume expansion coefficient αV by 20% (x═0.7) and modulates TC (442–625 K),
Jiayuan Li, Chenfei Qv, Haoran Tu, Qinfen Gu, Wayne D. Hutchison, Stewart J. Campbell, Zhenxiang Cheng, Wenquan Wang, Jianli Wang   +8 more
wiley   +1 more source

Realizing negative thermal expansion over an extended temperature range in PbTiO3-based perovskites

Journal of Advanced Ceramics
Negative thermal expansion (NTE) is fascinating, as it involves a material’s volume contraction rather than expansion upon heating. Although NTE lattices typically have highly flexible frameworks, the magnitude of NTE is often very small, and they ...
Zhao Pan, Fengyi Zhou, Mengqi Ye, Duo Wang, Qiumin Liu, Takumi Nishikubo, Xubin Ye, Xiao Wang, Jin Liu, Nianpeng Lu, Shogo Kawaguchi, Masaki Azuma, Youwen Long   +12 more
doaj   +1 more source

The nature of iron-oxygen vacancy defect centers in PbTiO3

, 2005
The iron(III) center in ferroelectric PbTiO3 together with an oxygen vacancy forms a charged defect associate, oriented along the crystallographic c-axis.
A. Abragam, D. C. Lupascu, D. M. Smyth, D. M. Smyth, H. Ehrenberg, H. Meštrić, J. F. Scott, K. A. Schönau, K.-P. Dinse, M. E. Lines, M. Knapp, P. C. Schmidt, P. W. Stephens, R. E. Cohen, R.-A. Eichel, S. H. Vosko, S. Ikegami, S. Serrano, So. Laubach, St. Laubach, T. J. Yan, T. Kloss, V. Gavrilyachenko, W. L. Warren   +23 more
core   +1 more source

Discovery of Novel Materials with Giant Dielectric Constants via First‐Principles Phonon Calculations and Machine Learning

Advanced Intelligent Discovery, EarlyView.
We discovered novel materials with giant dielectric constants by combining first‐principles phonon calculations and machine learning. Screening 525 perovskites identified six candidates. RbNbO3 was synthesized under pressure and showed ε ≈ 800–1000. This validates our framework as a powerful tool for high‐performance dielectric materials discovery.
Hiroki Moriwake, Kazuki Shitara, Rie Yokoi, Takeharu Kato, Isao Tanaka, Ayako Yamamoto, Kimitoshi Murase, Yosuke Hamasaiki, Yoshitaka Ehara, Mitsuru Itoh   +9 more
wiley   +1 more source

Effect of in-plane strain anisotropy on (011) epitaxial BaTiO3 and PbTiO3 thin films

AIP Advances, 2017
Misfit strain phase diagrams of single-domain (011) epitaxial BaTiO3 and PbTiO3 thin films are computed using a thermodynamic phenomenological approach. In the case of (001) epitaxial films, the two orthogonal in-plane misfit strains are equivalent. For (
Wenhui Ma, Fei Wang
doaj   +1 more source

Preparation and characterization of PbTi0(3) ceramics modified by a natural mixture of rare earth oxides of xenotime [PDF]

Materials Research, 2013
Lead titanate ceramics modified by xenotime (Xm) with nominal composition (Pb, Xm)TiO3, Xm 10 or 15 mol %, were prepared by the conventional oxide mixture technique. Xenotime is a natural mineral consisting of a mixture of rare earth oxides.
Jair Baltazar-Rodrigues, Pedro Rodrigues Jr, Gerson K. da Cruz, Manuel H. Lente, José A. Eiras   +4 more
doaj   +2 more sources

Tuning of the depolarization field and nanodomain structure in ferroelectric thin films

, 2014
The screening efficiency of a metal-ferroelectric interface plays a critical role in determining the polarization stability and hence the functional properties of ferroelectric thin films.
Fernandez-Pena, Stéphanie, Lichtensteiger, Céline, Triscone, Jean-Marc, Weymann, Christian, Zubko, Pavlo   +4 more
core   +2 more sources

Excellent Comprehensive Electromechanical Properties in PZT‐Based Hard High‐Temperature Piezoceramics

Rare Metals, EarlyView.
ABSTRACT High‐power piezoelectric ceramics which have a wide operating temperature range are essential for sensor and actuator applications in extreme conditions. However, their development is fundamentally hindered by the inherent trade‐off among key parameters (TC, d33, Qm).
Rui Yan, Weisan Fang, He Qi, Hang Ma, Chenyu Zhao, Jie Wu, Weihang Liu, Huifen Yu, Yu Chen, Liang Chen, Jun Chen   +10 more
wiley   +1 more source