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...

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Problems solved by technology

The above methods all have their own advantages and disadvantages. For example, the solid phase reaction method is simple and easy to implement, but impurities are easily introduced during the ball milling process; the molten salt method needs to use salt to clean the sample in the preparation process, and it is also easy to affect the purity of the target product; the sol-gel method compares It is suitable for the preparation and doping of multiple oxides. The composite of CCTO and LSMO contains various cationic elements such as Ca, Cu, Ti, La, Sr, Mn, etc. After a large number of experimental studies, it is found that sol-gel preparation of CCTO and LSMO There is a large gap in the experimental conditions such as the required solvent, pH value, and post-sintering, so it is impossible to use the sol-gel method for one-step preparation

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