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US 12,597,543 B2Granted
Method for making spinel ferrite superparamagnetic composite
AssigneeImam Abdulrahman Bin Faisal University
InventorsYassine Slimani, Munirah Abdullah Almessiere, Abdulhadi Baykal
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Abstract
A magnetoelectric multiferroic nanocomposite. The nanocomposite comprises a ferroelectric perovskite oxide and a rare-earth substituted mixed ternary transition metal ferrite of the formula A1-xBxRyFe2-yO4. The nanocomposite has a high dielectric constant, low dielectric loss, both stable over a wide frequency range. These properties may make the nanocomposite desirable for applications in microelectronic devices, sensors and antennas.
Claims18
A method of forming a nanocomposite, comprising:
- mixing ferroelectric perovskite oxide particles and rare-earth substituted mixed ternary transition metal ferrite particles to form a particle mixture, wherein the mixing includes combining a solution of Thulium oxide with a solution of transition metal nitrate salts to form the perovskite oxide particles and the rare-earth substituted mixed ternary transition metal ferrite particles;
- milling the particle mixture to form a precursor powder;
- pressing the precursor powder to form a pellet;
- and
- sintering the pellet to form the nanocomposite;
- wherein the rare-earth substituted mixed ternary transition metal ferrite particles are of formula
- A1-xBxRyFe2-yO4,
- wherein A and B represent different transition metals;
- 0<x<1;
- R is Thulium;
- 0<y<0.2;
- and
- the rare-earth substituted mixed ternary transition metal ferrite particles are superparamagnetic at 0 to 50° C. and comprise tetragonal BaTiO3 (BTO) and Co0.7Zn0.3Tm0.01Fe1.99O4 (CZTFO) spinel ferrite phases.
10 more elements
A method of forming a nanocomposite, comprising:
- mixing ferroelectric perovskite oxide particles and rare-earth substituted mixed ternary transition metal ferrite particles to form a particle mixture, wherein the mixing includes combining a solution of a rare earth oxide with a solution of transition metal nitrate salts to form the perovskite oxide particles and the rare-earth substituted mixed ternary transition metal ferrite particles;
- milling the particle mixture to form a precursor powder;
- pressing the precursor powder to form a pellet;
- and
- sintering the pellet to form the nanocomposite;
- wherein the rare-earth substituted mixed ternary transition metal ferrite particles are of formula
- A1-xBxRyFe2-yO4,
- wherein A and B represent different transition metals:
- 0<x<1;
- R is a rare-earth element;
- 0<y<0.2;
- and
- the rare-earth substituted mixed ternary transition metal ferrite particles are superparamagnetic at 0 to 50° C. and comprise tetragonal BaTiO3 (BTO) BTO and Co0.7Zn0.3Tm0.01Fe1.99O4 (CZTFO) spinel ferrite phases,
- wherein the pressing is performed at 900 to 1100 MPa.
11 more elements
A method of forming a nanocomposite, comprising:
- mixing ferroelectric perovskite oxide particles and rare-earth substituted mixed ternary transition metal ferrite particles to form a particle mixture, wherein the mixing includes combining a solution of a rare earth oxide with a solution of transition metal nitrate salts to form the perovskite oxide particles and the rare-earth substituted mixed ternary transition metal ferrite particles;
- milling the particle mixture to form a precursor powder;
- pressing the precursor powder to form a pellet;
- and
- sintering the pellet to form the nanocomposite;
- wherein the rare-earth substituted mixed ternary transition metal ferrite particles are of formula
- A1-xBxRyFe2-yO4,
- wherein A and B represent different transition metals:
- 0<x<1;
- R is a rare-earth element;
- 0<y<0.2;
- and
- the rare-earth substituted mixed ternary transition metal ferrite particles are superparamagnetic at 0 to 50° C. and comprise tetragonal BaTiO3 (BTO) and Co0.7Zn0.3Tm0.01Fe1.99O4 (CZTFO) spinel ferrite phases,
- wherein the rare-earth substituted mixed ternary transition metal ferrite particles are prepared by:
- mixing a cobalt (II) source, a zinc (II) source, an iron (III) source, and a thulium source in a solvent to form a precursor solution;
- adding a base to the precursor solution to form a reaction mixture having a pH of 11 to 12;
- ultrasonically treating the reaction mixture at a frequency of 18 to 25 kHz and a power of 50 to 100 W to form a precipitate;
- and
- drying the precipitate to form the rare-earth substituted mixed ternary transition metal ferrite particles.
16 more elements
Dependencies are inferred from the claim text.