A kind of multiferroic solid solution ceramics and preparation method thereof

A solid solution and multiferroic technology, applied in the field of multiferroic solid solution ceramics and its preparation, can solve the problems of large ceramic loss and low magnetoelectric coupling effect, reduce loss, improve magnetic and magnetoelectric coupling effects, and low leakage Effects of current and dielectric losses

Active Publication Date: 2021-07-09
JIANGXI UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] In view of the above-mentioned situation, the present invention provides a kind of multiferroic solid solution ceramics and preparation method, to solve BiFeO 3 The problem of large loss of base multiferroic solid solution ceramics and low magnetoelectric coupling effect

Method used

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  • A kind of multiferroic solid solution ceramics and preparation method thereof
  • A kind of multiferroic solid solution ceramics and preparation method thereof
  • A kind of multiferroic solid solution ceramics and preparation method thereof

Examples

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Embodiment 1

[0026] A multiferroic solid solution ceramic, the chemical composition of the multiferroic solid solution ceramic is expressed as (1-x-y)BiFeO 3 -xLaFeO 3 -yPbFeO 2.5 , where x is LaFeO 3 Mole percent of , y is PbFeO 2.5 The mole percentage of x=0.10, y=0.30, the preparation method of this multiferroic solid solution ceramics is as follows:

[0027] Step 1, prepare analytically pure powder raw material Bi 2 o 3 (purity ≥ 99.0%), Fe 2 o 3 (purity≥99.0%), La 2 o 3 (purity ≥ 99%), PbO (purity ≥ 99%), each powder raw material is dried at 500 ° C to remove moisture;

[0028] Step 2, according to the chemical formula BiFeO 3 Weigh the corresponding proportion of Bi 2 o 3 and Fe 2 o 3 , add a certain proportion of absolute ethanol for ball milling and mixing for 6 hours, take out the mixed slurry and bake in an oven at 90°C for 6 hours, pass through an 80-mesh sieve, and put the sieved mixed powder into an alumina crucible , pre-fired at 750°C for 2 hours in an air atm...

Embodiment 2

[0036] A multiferroic solid solution ceramic, the chemical composition of the multiferroic solid solution ceramic is expressed as (1-x-y)BiFeO 3 -xLaFeO 3 -yPbFeO 2.5 , where x is LaFeO 3 Mole percent of , y is PbFeO 2.5 The mole percentage of x=0, y=0.

[0037] Steps 1-2 in the preparation method of the multiferroic solid solution ceramics in this embodiment are basically the same as Steps 1-2 in Example 1, and the main difference from Example 1 lies in the subsequent steps, and the solid solution content is different at the same time, specifically x=0, y=0, due to LaFeO 3 and PbFeO 2.5 The content of is 0, therefore, does not need step 3 and step 4 among the embodiment 1, directly carries out step 5;

[0038] Step 5, weigh the above BiFeO 3 For powder, add a certain amount of deionized water for ball milling and mixing for 6 hours, take out the mixed slurry and bake it in an oven at 120°C for 12 hours, pass through a 80-mesh sieve, and add a concentration of 5wt% pol...

Embodiment 3

[0040] A multiferroic solid solution ceramic, the chemical composition of the multiferroic solid solution ceramic is expressed as (1-x-y)BiFeO 3 -xLaFeO 3 -yPbFeO 2.5 , where x is LaFeO 3 Mole percent of , y is PbFeO 2.5 The molar percentage of x=0.1, y=0.

[0041] Steps 1-3 in the preparation method of multiferroic solid solution ceramics in this embodiment are basically the same as steps 1-3 in Example 1, the main difference from Example 1 lies in the subsequent steps, and at the same time, the solid solution content is different, specifically x=0.1, y=0, due to PbFeO 2.5 The content of is 0, therefore, does not need step 4 among the embodiment 1, directly carries out step 5;

[0042] Step 5, by stoichiometric ratio 0.90BiFeO 3 -0.10LaFeO 3 Weigh the above BiFeO 3 、LaFeO 3 For powder, add a certain proportion of deionized water for ball milling and mixing for 6 hours, take out the mixed slurry and bake it in an oven at 120°C for 12 hours, pass through a 80-mesh siev...

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Abstract

The invention provides a multiferroic solid solution ceramic and a preparation method thereof, the chemical composition of the multiferroic solid solution ceramic is expressed as (1‑x‑y)BiFeO 3 ‑xLaFeO 3 -yPbFeO 2.5 , where x is LaFeO 3 Mole percent of , y is PbFeO 2.5 The mole percentage of , 0≤x≤0.10, 0≤y≤0.35. The present invention adopts a ternary solid solution system, namely BiFeO 3 、LaFeO 3 and PbFeO 2.5 , which have different effects, among which BFO has an intrinsic magnetoelectric coupling effect, LFO can reduce the loss of BFO, stabilize the structure of BFO and make PbFeO 2.5 It is easier to dissolve in solid solution, PbFeO 2.5 Losses can be further reduced while improving magnetic and magnetoelectric coupling effects. In the present invention, BiFeO 3 Powder, LaFeO 3 Powder and PbFeO 2.5 The powder is prepared, then granulated and sintered together. This preparation method can effectively reduce the final solid solution sintering temperature, thereby reducing the volatilization of Bi and Pb elements at high temperatures.

Description

technical field [0001] The invention relates to the technical field of information storage materials, in particular to a multiferroic solid solution ceramic and a preparation method thereof. Background technique [0002] A multiferroic material is a material in which electricity, magnetism, and structural order are coupled with each other. It has two or three "ferroic" properties: ferroelectricity, ferromagnetism, and ferroelasticity. The new non-volatile memory made of multiferroic materials has higher storage density, lower power consumption and faster response than traditional memories, and is a strong competitor for the next generation of memories. Among them, BiFeO 3 (BFO) is the only one with high Curie temperature (T c ~1103K) and high Neil temperature (T N ~643K) single-phase multiferroic materials. BFO single-phase multiferroic materials have rich physical phenomena and many potential applications, and can be used in functional devices such as sensors, multi-sta...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B35/26C04B35/622
CPCC04B35/2641C04B35/622C04B2235/3227C04B2235/3296C04B2235/3298C04B2235/6562C04B2235/6567C04B2235/76C04B2235/766C04B2235/77C04B2235/786
Inventor 薛飞田娅晖
Owner JIANGXI UNIV OF TECH
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