Electronic device and dielectric ceramic composition and its preparing method

A technology of dielectric ceramics and composites, applied in the field of multilayer capacitors or other electronic devices, can solve problems such as insufficient dielectric constant, and achieve the effects of small temperature dependence, improved dielectric constant, and small voltage dependence

Inactive Publication Date: 2006-07-05
TDK CORPARATION
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this dielectric ceramic composition, the dielectric constant is insufficient, and the temperature

Method used

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  • Electronic device and dielectric ceramic composition and its preparing method
  • Electronic device and dielectric ceramic composition and its preparing method
  • Electronic device and dielectric ceramic composition and its preparing method

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] Manufacturing method of multilayer ceramic capacitor

[0051] The multilayer ceramic capacitor made of the dielectric ceramic composition of the present invention is made of a green chip by a general printing method or a sheet-making method using a paste, sinters the green chip, and then prints or transfers and calcines the external electrodes. The fabrication method will be described in detail below.

[0052] The dielectric layer paste may be an organic type paint obtained by mixing the dielectric layer components with an organic vehicle, and may be a water-based paint.

[0053] As for the dielectric component, the above-mentioned oxides or their mixtures or composite oxides can be used, but various compounds that form the above-mentioned oxides or composite oxides after sintering, such as carbonates, oxalates, can also be appropriately selected and mixed. , nitrates, hydroxides and organometallic compounds. The content of these compounds in the dielectric member is ...

Embodiment 1

[0091] First based on the BaTiO 3 Consists of 100 mol% Barium Titanate (A), weighing 0.5 mol% MnCO 3 . It was mixed with pure water and ground for 16 hours in a ball mill with zircon balls. Next, let the mixture dry in a high-temperature oven at 130° C. to evaporate moisture. The dried resulting powder was calcined at 1100 °C to obtain BaTiO 3 and MnO mixture. Note that the calcination is performed in a reducing atmosphere or even in air.

[0092] Based on 100 mol% pre-calcined barium titanate (A), weigh 50 mol% post-added BaTiO 3 (B), 2.5 mol% MgCO 3 , 2.5 mol% of Y 2 o 3 , 1.5 mol% CaCO 3 and 4 mol% SiO 2 . Calcined BaTiO 3 The mixture with MnO was mixed with pure water and ground for 16 hours in a ball mill with zircon balls. Then the mixture was dried in a high-temperature oven at 130° C. to evaporate moisture to obtain a dielectric component.

[0093] Note that the particle sizes of the pre-calcined barium titanate (A) and the post-added barium titanate (B) ...

Embodiment 2-4

[0125] The same procedure as in Example 1 was followed, except that FeO, CoO or NiO was used instead of MnO as shown in Table 1 to prepare capacitor samples. These samples were tested in the same manner as in Example 1. As shown in Table 1, it was confirmed that the samples had superior characteristics similar to those of Example 1 in terms of dielectric constant (ε), temperature characteristics, voltage characteristics, dielectric loss (tanσ) and insulation resistance (IR).

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Abstract

A dielectric ceramic composition comprising as main components barium titanate and a component M (wherein M is at least one type of component selected from manganese oxide, iron oxide, cobalt oxide, and nickel oxide) and having a ferroelectric phase region, wherein the concentration of the component M in the ferroelectric phase region changes from the outside toward the center. The concentration of the component M in the ferroelectric phase region is higher at the outside compared with near the center of the ferroelectric phase region. It is possible to realize a multi-layer capacitor which can satisfy both of the X7R characteristic (EIA standard) and B characteristic (EIAJ standard) of the temperature characteristic of the electrostatic capacity, has little voltage dependency of the electrostatic capacity and the insulation resistance, is superior in insulation breakdown resistance, and can use Ni or a Ni alloy as the internal electrode layer.

Description

technical field [0001] The present invention relates to a multilayer capacitor or other electronic devices, a dielectric ceramic composition suitable for use as a dielectric layer in an electronic device, and a method for manufacturing the same. Background technique [0002] Multilayer ceramic capacitors are widely used as compact high-capacity and highly reliable electronic devices. The quantities used in every piece of electrical and electronic equipment have been increasing. In recent years, as demands for miniaturization and improved performance of devices have increased, further reduction in size, increase in capacity, reduction in price, and improvement in reliability of multilayer ceramic capacitors have been urgently required. [0003] A key technology to reduce the price is to use relatively cheap Ni or Ni alloy instead of expensive Pd or Pd alloy as the inner electrode. In addition, the key technology to reduce the size and increase the capacity is to reduce the ...

Claims

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Application Information

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IPC IPC(8): H01B3/12C04B35/468C04B35/622H01G4/12C04B35/46H01G4/008H01G4/30
CPCH01G4/1227C04B35/4682C04B35/468H01G4/008H01G4/12H01G4/30
Inventor 增田健
Owner TDK CORPARATION
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