Results 191 to 200 of about 3,184 (248)

Thermodynamic Theory of Ferroelectric Ceramics

Physical Review, 1957
A review of theories of ferroelectricity and of experimental data on ferroelectric ceramics leads to the conclusion that an analytic theory of such ceramics on microscopic basis does not seem feasible. A thermodynamic continuum theory is developed here, which is based on the postulated isomorphism, relevant to small signals only, between a polarized ...
openaire   +1 more source

MECHANICAL PROPERTIES OF FERROELECTRIC CERAMIC NANOCOMPOSITES

International Journal of Nanoscience, 2005
The micro- and nano-indentation techniques and compression tests were employed to determine the mechanical properties of PZT based composites dispersed with Al 2 O 3 nano-particles for comparison. Compared with the reduced modulus, the nano-hardness, which exhibited indentation size effect (ISE), seemed to be more sensitive to the indentation depth ...
Wang, XX, Kwok, KW, Lee, KL, Kah Soh, AK
openaire   +4 more sources

Domain switching in polycrystalline ferroelectric ceramics

Nature Materials, 2005
Ferroelectric ceramics are widely used as sensors and actuators for their electro-mechanical properties, and in electronic applications for their dielectric properties. Domain switching--the phenomenon wherein the ferroelectric material changes from one spontaneously polarized state to another under electrical or mechanical loads--is an important ...
Li, J. Y., Rogan, R. C., Ãœstündag, E., Bhattacharya, K.   +3 more
openaire   +3 more sources

Ultrahigh piezoelectricity in ferroelectric ceramics by design

Nature Materials, 2018
Piezoelectric materials, which respond mechanically to applied electric field and vice versa, are essential for electromechanical transducers. Previous theoretical analyses have shown that high piezoelectricity in perovskite oxides is associated with a flat thermodynamic energy landscape connecting two or more ferroelectric phases.
Fei Li, Dabin Lin, Zibin Chen, Zhenxiang Cheng, Jianli Wang, ChunChun Li, Zhuo Xu, Qianwei Huang, Xiaozhou Liao, Long-Qing Chen, Thomas R. Shrout, Shujun Zhang   +11 more
openaire   +3 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   +1 more source

Ferroelectric zirconate ceramics

1949 Conference on Electrical Insulation, 1949
A new class of ferroelectric ceramics was revealed in a study of mixtures of lead zirconate and up to 40 mol percent barium zirconate. These compositions were prepared from pure zirconium oxide, lead monoxide and barium carbonate mixed in the desired stoichiometric proportions and calcined in covered platinum crucibles at 1050°C.
openaire   +1 more source

Printing with ferroelectric ceramics

Ferroelectrics, 1997
Abstract For printing applications, ferroelectric (FE) material can be poled without electrodes by charging the surface at the image areas in one polarity and the background to the opposite polarity. On the surface of FE-ceramics, high electric fields are produced which are able to attract or repel charged toner particles. This property can be used for
openaire   +1 more source

Thermal stresses in ferroelectric ceramics

Ferroelectrics, 1998
The conception of special thermal stresses in ferroelectrics ceramics based on the existence of conglomerates of grains is presented.
S. O. Kramarov, Yu. V. Dashko
openaire   +1 more source

Piezoelectric properties of a ferroelectric ceramic

Strength of Materials, 1984
1. The laser interferometer that was developed has a resolving power of 30 A and ensures an error no greater than 0.05% for the measurement of quasistatic strains, which makes it possible to use the interferometer to study the physicomechanical properties of lowductility ceramics. 2.
V. A. Kuz'menko, V. N. Nishchenets, G. G. Pisarenko, V. K. Khaustov   +3 more
openaire   +1 more source

Strong ultrasonic microwaves in ferroelectric ceramics

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   +2 more sources