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Multilayer ceramic capacitor
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A technology of ceramic capacitors and laminates, applied in the direction of laminated capacitors, capacitors, fixed capacitors, etc., to achieve high reliability
Pending Publication Date: 2022-02-22
MURATA MFG CO LTD
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[0009] In recent years, the demand for multilayer ceramic capacitors with high reliability has become stronger, and previously proposed technologies are insufficient to meet this demand
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[0081] The present invention will be described in more detail using the following examples and comparative examples. However, the present invention is not limited to the following examples.
[0082] (1) Manufacture of multilayer ceramic capacitors
example 1～ example 34
[0084] As the main component raw material, powdered calcium carbonate (CaCO 3 ), strontium carbonate (SrCO 3 ), titanium oxide (TiO 2 ) and zirconia (ZrO 2 ). The prepared main component raw materials were weighed, wet-mixed using a ball mill, dried and crushed to obtain a mixed powder. The obtained mixed powder was calcined in the atmosphere at 1200° C. for 2 hours, and then crushed to obtain a main component powder.
[0085] Powdered silicon dioxide (SiO 2 ), manganese carbonate (MnCO 3 ) and lithium oxide (Li 2 O). After weighing the main component powder and the additive component powder, they were wet-mixed using a ball mill, crushed and dried to obtain a dielectric layer raw material powder. In addition, dielectric layer raw material powders (main component raw materials and additive component powders) were blended so that the composition of the dielectric layer of the manufactured multilayer ceramic capacitor was as shown in Table 1. That is, since a part of Li...
example 1～ example 34
[0091] For Examples 1 to 34, various characteristics were evaluated as follows.
[0092]
[0093] The external electrodes of the laminated ceramic capacitor were removed by grinding, and the obtained laminate was dissolved by an alkaline melting method, and the solution was subjected to ICP analysis. From the obtained analysis results, the internal electrode component (Cu) was excluded, and the amount of each component contained in the dielectric layer was investigated.
[0094]
[0095] Lithium ions (Li ions) in the LT cross section of the central part in the width direction (L direction) of the laminated ceramic capacitor were analyzed by the time-of-flight secondary ion mass spectrometry (Tof-SIMS) method. + ) and copper ions (Cu + ) distribution, and obtained the secondary ion map.
[0096] When performing the analysis, the sample was pretreated under the following conditions.
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Abstract
The invention provides a multilayer ceramic capacitor with high reliability. The multilayer ceramic capacitor includes a multilayer body including a plurality of dielectric layers and a plurality of internal electrodes, wherein the dielectric layers and the internal electrodes are stacked alternately; and external electrodes provided on end surfaces of the multilayer body and electrically connected to the internal electrodes, wherein the dielectric layers each include main crystal grains including calcium (Ca) and / or strontium (Sr), and zirconium (Zr); and an additive component including lithium (Li), the internal electrodes include copper (Cu), and the dielectric layers have lithium (Li) concentrations with a standard deviation of about 1.03 atomic percent or less in the thickness direction.
Description
technical field [0001] The present invention relates to laminated ceramic capacitors. Background technique [0002] In recent years, demands for miniaturization and high density of various electronic devices have rapidly increased, and the demand for multilayer ceramic capacitors is rapidly increasing in response to the demands. In addition, multilayer ceramic capacitors are also used in applications under severe temperature environments such as automotive applications, and therefore require low cost and high reliability. Moreover, in order to meet this requirement, it is proposed to have (Ca, Sr) ZrO 3 Multilayer ceramic capacitors with ceramic-like layers and copper (Cu) internal electrodes. [0003] For example, Patent Document 1 discloses a multilayer ceramic capacitor (claim 3 of Patent Document 1), which includes a ceramic laminate in which ceramic dielectric layers and internal electrode layers are alternately laminated and has a substantially rectangular parallelep...
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