Containerless processing of metastable multiferroic composite in Ln‐(Mn, Fe)‐O system (Ln: Lanthanide)

2020 ◽  
Vol 103 (9) ◽  
pp. 4822-4831
Author(s):  
Kazuhiko Kuribayashi ◽  
Shouta Shirasawa ◽  
You Hayasaka ◽  
Suguru Shiratori ◽  
Shumpei Ozawa
Keyword(s):  
Containerless Processing ◽  
Multiferroic Composite

Magnetoelectric Properties of Low Temperature Sintered CoFe2O4-(PZN-PZT) Multiferroic Composite Materials

2016 ◽  
Vol 31 (6) ◽  
pp. 561
Author(s):  
FAN Gui-Fen ◽  
XU Xing ◽  
WANG Kai ◽  
LV Wen-Zhong ◽  
LIANG Fei ◽  
...  
Keyword(s):  
Composite Materials ◽  
Low Temperature ◽  
Magnetoelectric Properties ◽  
Multiferroic Composite

The Determination of the Magnetoelectric Coupling Coefficient in Ferroelectric–Ferromagnetic Composite Based on PZT–Ferrite

2013 ◽  
Vol 58 (4) ◽  
pp. 1401-1403 ◽  
Author(s):  
J.A. Bartkowska ◽  
R. Zachariasz ◽  
D. Bochenek ◽  
J. Ilczuk
Keyword(s):  
Dielectric Permittivity ◽  
Coupling Coefficient ◽  
Mean Field ◽  
Field Approximation ◽  
Theoretical Description ◽  
Magnetoelectric Coupling ◽  
Mean Field Approximation ◽  
Dielectric Measurements ◽  
Temperature Dependences ◽  
Multiferroic Composite

Abstract In the present work, the magnetoelectric coupling coefficient, from the temperature dependences of the dielectric permittivity for the multiferroic composite was determined. The research material was ferroelectric-ferromagnetic composite on the based PZT and ferrite. We investigated the temperature dependences of the dielectric permittivity (") for the different frequency of measurement’s field. From the dielectric measurements we determined the temperature of phase transition from ferroelectric to paraelectric phase. For the theoretical description of the temperature dependence of the dielectric constant, the Hamiltonian of Alcantara, Gehring and Janssen was used. To investigate the dielectric properties of the multiferroic composite this Hamiltonian was expressed under the mean-field approximation. Based on dielectric measurements and theoretical considerations, the values of the magnetoelectric coupling coefficient were specified.

TEM Characterization of Pseudotetragonal Mullite

2001 ◽  
Vol 7 (S2) ◽  
pp. 426-427
Author(s):  
Bradley R. Johnson ◽  
Waltraud M. Kriven
Keyword(s):  
Phase Diagram ◽  
Spatial Relationship ◽  
Equilibrium Structure ◽  
Lattice Parameters ◽  
Orthorhombic Structure ◽  
Containerless Processing ◽  
Rich Phase ◽  
Tem Characterization ◽  
Solution Field

Mullite (3Al2O3•2SiO2) exists in a solid solution field (∼57-63 mol% Al2O3) as the only stable compound in the Al2O3•SiO2 phase diagram at ambient pressures. Equilibrium 3:2 mullite has an orthorhombic structure with b>a (o-mullite). However, when initially crystallized from molecularly mixed, 3:2 precursors at temperatures < 1200°C, the first phase that forms has lattice parameters with a ≈b. This structure is often termed pseudotetragonal mullite (pt-mullite), since even when the ‘a’ and ‘b’ lattice parameters are identical, they are symmetrically independent. Pseudotetragonal mullite has been shown to contain approx. 70 mol% Al2O3. with increasing time and temperature, the structure gradually assimilates the residual SiO2, and the lattice parameters change, such that by 1400°C, the material has attained its equilibrium structure and composition.TEM was used to determine the spatial relationship between the crystalline phase and the residual, amorphous, SiO2-rich phase in pt-mullite. The starting materials were quenched, 3:2 mullite beads and fibers (made by containerless processing).

A permendur-piezoelectric multiferroic composite for low-noise ultrasensitive magnetic field sensors

2012 ◽  
Vol 100 (17) ◽  
pp. 173506 ◽  
Author(s):  
G. Sreenivasulu ◽  
U. Laletin ◽  
V. M. Petrov ◽  
V. V. Petrov ◽  
G. Srinivasan
Keyword(s):  
Magnetic Field ◽  
Low Noise ◽  
Magnetic Field Sensors ◽  
Multiferroic Composite

Containerless processing for preparation of akermanite bioceramic spheres with homogeneous structure, tailored bioactivity and degradation

2013 ◽  
Vol 1 (7) ◽  
pp. 1019-1026 ◽  
Author(s):  
Chengtie Wu ◽  
Minghui Zhang ◽  
Dong Zhai ◽  
Jianding Yu ◽  
Yan Liu ◽  
...  
Keyword(s):  
Homogeneous Structure ◽  
Containerless Processing

Overview of Containerless Processing Technologies

1981 ◽  
Vol 9 ◽  
Author(s):  
M. Barmatz
Keyword(s):  
Space Shuttle ◽  
Physical Contact ◽  
Materials Processing ◽  
Containerless Processing ◽  
Processing Technologies ◽  
Air Jets ◽  
Developmental Progress ◽  
Processing Techniques ◽  
And Control ◽  
Near Future

ABSTRACTIn the near future, a large segment of the scientific community will have an opportunity to perform materials processing experiments on the Space Shuttle in the reduced gravity environment of space. Many of these experiments will require containerless processing techniques that provide manipulation and control of weightless (molten) materials without physical contact with container walls or other holding devices. A variety of containerless processing technologies are now being developed for space and ground-based materials processing facilities. The utilization of air jets or high intensity acoustic, electromagnetic or electrostatic fields can produce forces that support and manipulate materials. Most of the present containerless research is directed toward the development of high temperature systems capable of melting and resolidifying materials. This paper will review the materials processing capabilities and level of developmental progress of each technique. An introduction to available NASA test facilities will also be given.

Phase transitions and magneto-electric properties of 70 wt. % Pb(Fe0.5Nb0.5)O3–30 wt. % Co0.6Zn0.4Fe1.7Mn0.3O4 multiferroic composite

2021 ◽  
Vol 130 (11) ◽  
pp. 114101
Author(s):  
Krishnamayee Bhoi ◽  
Smaranika Dash ◽  
Sita Dugu ◽  
Dhiren K. Pradhan ◽  
M. M. Rahaman ◽  
...  
Keyword(s):  
Phase Transitions ◽  
Electric Properties ◽  
Multiferroic Composite
Sign in / Sign up

Export Citation Format

Share Document