Method for preparing lanthanum strontium manganite/copper calcium titanate composite magnetoelectric ceramic material by virtue of sol-gel method

Abstract

The invention belongs to the technical field of ceramic synthesis and provides a method for preparing a strontium lanthanum manganate / copper calcium titanate composite magnetoelectric ceramic materialby virtue of a sol-gel method. The method comprises the steps of respectively preparing lanthanum strontium manganite (LSMO) precursor powder, copper calcium titanate and CCTO precursor powder by virtue of the sol-gel method, mixing the LSMO precursor powder with the CCTO precursor powder, adding an adhesive, uniformly mixing, pressing to form a ceramic blank, and sintering a ceramic blank, so asto obtain a strontium lanthanum manganate / copper calcium titanate (LSMO-CCTO) composite magnetoelectric ceramic sample. The method has the beneficial effects that the raw materials are low in cost; components in the reaction process are controllable, and an impure phase is avoided; the gelling time is short; a preparation process is simple, and the dielectric property and magnetism of the ceramicsample have very strong regularity; a ceramic wafer is high in density and grain uniformity; and the process is simple and easy for industrial production, the prepared ceramic sample is high in density and grain uniformity and excellent in magnetoelectric performance.

Description

technical field

[0001] The invention belongs to the technical field of ceramic synthesis, and specifically relates to a method for preparing strontium lanthanum manganate / copper calcium titanate composite magnetoelectric ceramic materials by a sol-gel method. The prepared magnetoelectric ceramic materials have high dielectric properties and magnetic properties at the same time. characteristic. Background technique

[0002] The rapid development of the information industry has made "miniaturization, multi-function, and wireless" an inevitable trend in the development of electronic components. Electronic materials, as carriers of electronic components, are also following this trend towards high integration and multi-functionality, and single-functional materials are increasingly unable to meet the needs of technological development. Therefore, the research of multifunctional composite materials has received more and more attention in recent years.

[0003] Dielectric materia...

Examples

Embodiment 1

[0019] Example 1: A method for preparing strontium lanthanum manganate / copper calcium titanate composite magnetoelectric ceramic materials by a sol-gel method, using the sol-gel method to prepare strontium lanthanum manganate or LSMO precursor powder and copper titanate respectively Calcium and CCTO precursor powder, LSMO and CCTO precursor powder are mixed and then added with a binder, mixed evenly and pressed into a ceramic body, and the ceramic body is sintered to obtain strontium lanthanum manganate / copper calcium titanate, that is, LSMO-CCTO composite Magnetoelectric ceramic samples.

[0020] Specific steps are as follows:

[0021](1) Preparation of strontium lanthanum manganate or LSMO precursor powder: A. Weigh 29.16 g of lanthanum nitrate, 7.13 g of strontium nitrate and 50.68 g of citric acid, and use deionized water as a solvent to completely dissolve the three raw materials to obtain a white Transparent mixed solution A1; Measure 35.79 g of manganese nitrate soluti...

Embodiment 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio between LSMO and CCTO is different (x=0.2), and 2 g and 8 g are weighed respectively. After dielectric performance testing, it is found that compared with the embodiment 1. The dielectric constant of the sample decreases, and the decrease is relatively large. It was found through the magnetic performance test that compared with Example 1, the magnetic properties of the sample also decreased significantly, down to 0.28 emu / g.

Embodiment 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio between LSMO and CCTO is different (x=0.1), and 1 g and 9 g are weighed respectively. After dielectric performance testing, it is found that compared with the embodiment 1 and 2, the dielectric constant of the sample continued to decrease. It is found that compared with Examples 1 and 2, the samples show almost no magnetic characteristics after magnetic property testing.

technical field

[0001] The invention belongs to the technical field of ceramic synthesis, and specifically relates to a method for preparing strontium lanthanum manganate / copper calcium titanate composite magnetoelectric ceramic materials by a sol-gel method. The prepared magnetoelectric ceramic materials have high dielectric properties and magnetic properties at the same time. characteristic. Background technique

[0002] The rapid development of the information industry has made "miniaturization, multi-function, and wireless" an inevitable trend in the development of electronic components. Electronic materials, as carriers of electronic components, are also following this trend towards high integration and multi-functionality, and single-functional materials are increasingly unable to meet the needs of technological development. Therefore, the research of multifunctional composite materials has received more and more attention in recent years.

[0003] Dielectric materia...

Examples

Embodiment 1

[0019] Example 1: A method for preparing strontium lanthanum manganate / copper calcium titanate composite magnetoelectric ceramic materials by a sol-gel method, using the sol-gel method to prepare strontium lanthanum manganate or LSMO precursor powder and copper titanate respectively Calcium and CCTO precursor powder, LSMO and CCTO precursor powder are mixed and then added with a binder, mixed evenly and pressed into a ceramic body, and the ceramic body is sintered to obtain strontium lanthanum manganate / copper calcium titanate, that is, LSMO-CCTO composite Magnetoelectric ceramic samples.

[0020] Specific steps are as follows:

[0021](1) Preparation of strontium lanthanum manganate or LSMO precursor powder: A. Weigh 29.16 g of lanthanum nitrate, 7.13 g of strontium nitrate and 50.68 g of citric acid, and use deionized water as a solvent to completely dissolve the three raw materials to obtain a white Transparent mixed solution A1; Measure 35.79 g of manganese nitrate soluti...

Embodiment 2

[0028] Embodiment 2: The difference between this embodiment and Embodiment 1 is that the mass ratio between LSMO and CCTO is different (x=0.2), and 2 g and 8 g are weighed respectively. After dielectric performance testing, it is found that compared with the embodiment 1. The dielectric constant of the sample decreases, and the decrease is relatively large. It was found through the magnetic performance test that compared with Example 1, the magnetic properties of the sample also decreased significantly, down to 0.28 emu / g.

Embodiment 3

[0029] Embodiment 3: The difference between this embodiment and Embodiment 1 is that the mass ratio between LSMO and CCTO is different (x=0.1), and 1 g and 9 g are weighed respectively. After dielectric performance testing, it is found that compared with the embodiment 1 and 2, the dielectric constant of the sample continued to decrease. It is found that compared with Examples 1 and 2, the samples show almost no magnetic characteristics after magnetic property testing.

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