Dielectric ceramic, process for producing the same, and laminated ceramic capacitor

A technology of ceramic capacitors and dielectrics, which is applied in the field of laminated ceramic capacitors, can solve the problems of poor durability under high temperature load, lower dielectric constant, lower reliability, etc., and achieve improved sinterability, improved reduction resistance, and improved reliability Effect

Active Publication Date: 2007-08-29
MURATA MFG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0012] However, the problems in the above-mentioned Patent Documents 1 and 2 are that when the thickness of the dielectric layer is more than 20 μm, good insulation and durability under high-temperature load can be ensured, but if the thickness of the dielectric layer is reduced to about 1 to 3 μm, These insulation properties and durability under high-temperature loads deteriorate, resulting in reduced reliability.
[0013] In addition, the problem in Patent Document 2 is that the die...

Method used

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  • Dielectric ceramic, process for producing the same, and laminated ceramic capacitor
  • Dielectric ceramic, process for producing the same, and laminated ceramic capacitor

Examples

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Embodiment 1

[0094] First, prepare BaCO with an average particle size of 50 nm as a ceramic raw material 3 , CaCO 3 、TiO 2 and V 2 o 5 , These ceramic raw materials were weighed according to a prescribed amount, and after putting the weighed objects into a ball mill, they were kneaded and pulverized by a wet method for 24 hours. Next, heat treatment is carried out at a temperature of 1000-1150°C, and the chemical composition formula (Ba 0.90 Ca 0.10 )(Ti 0.999 V 0.001 )O 3 Main components of Examples 1-3 and Comparative Examples 1-3 shown.

[0095] Then, the X-ray spectrum of each of these main components was measured by XRD (X-Ray Diffraction: X-ray diffraction device), and the half width ΔH (°) ​​was measured.

[0096] Then, prepare Y containing Y as the first additive component 2 o 3 , MnCO containing Mn as the second added component 3 , SiO containing Si as the third added component 2 .

[0097] And, with respect to 100 moles of the main component, weigh Y respectively 2...

Embodiment 2

[0119] Prepare BaCO 3 , CaCO 3 、TiO 2 , V 2 o 5 , Nb 2 o 5 、 Ta 2 o 5 、Cr 2 o 3 、MoO 3 and WO 3 , by approximately the same method and procedure as in [Example 1], the (Ba, Ca)(Ti, X)O of Examples 11 to 33 having the compounding molar ratio shown in Table 4 was prepared. 3 (X=at least one of V, Nb, Ta, Cr, Mo, and W) is the main component, and the X-ray spectrum of the main component is measured by XRD to measure the half-amplitude ΔH.

[0120] Then, prepare La as a rare earth oxide 2 o 3 , CeO 2 、Pr 5 o 11 、Nd 2 o 3 、Sm 2 o 3 、Eu 2 o 3 、Gd 2 o 3 , Tb 2 o 3 、Dy 2 o 3 、Ho 2 o 3 、Er 2 o 3 、Tm 2 o 3 , Yb 2 o 3 、Lu 2 o 3 and Y 2 o 3 , In addition, prepare MnO, NiO, Fe as metal oxides 2 o 3 , MgO, Al 2 o 3 , and then prepare SlO as a sintering aid 2 , Li 2 o 3 , B 2 o 3 、Dy 2 o 3 , MgO, SiO 2 , Li 2 o 3 Various additional components, each additional component is weighed by having the composition described in Table 2, thereafter ...

Embodiment 26

[0132]In Example 26, since the total amount of Dy and Y added as the first added component exceeds 6 moles and 4.0 moles with respect to 100 moles of the main component, the CR product is as low as 1255Ω·F at 25°C, and as low as 1255Ω·F at 125°C. As low as 3Ω·F, the insulation deteriorated, and 41 out of 100 failed products were produced in the high-temperature load test at 1000 hours, and all of them were defective products at 2000 hours.

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Abstract

The invention provides a dielectric ceramic and its manufacturing method as well as multilayer ceramic capacitor. Wherein, the dielectric ceramic of the invention comprises (Ba, Ca) (Ti, X) O3 as the main component (wherein X is an element of valence greater than that of Ti) and per 100 mol of the main component, 0.1 to 4.0 mol of each of 1st to 3rd addition components. The 1st addition component is a given rare earth element, the 2nd addition component has a given element whose valence is smaller than that of Ti, and the 3rd addition component has a sintering auxiliary containing Si. In >=90% of the main component particles (1), the sum of the solid-solution ratios exhibiting the states of solid solution of individual addition components (2) in the main component particles (1) is <= 10% in terms of sectional area ratio. The molar ratio of Ca loaded is in the range of 0 to 0.20 (preferably 0.02 to 0.20), and the molar ratio (y) of element X loaded in B-site is in the range of 0.0001 to 0.005. As a result, even when the thickness of the dielectric layer is reduced to about 1 to 3 micrometers, a high specific inductive capacity can be exhibited, and excellent insulation and high-temperature load life can be attained without detriment to the temperature characteristic of electrostatic capacity.

Description

technical field [0001] The present invention relates to a dielectric ceramic, a method for preparing a dielectric ceramic, and a laminated ceramic capacitor, and in particular, to a dielectric ceramic suitable for a dielectric material of a small-sized, large-capacity laminated ceramic capacitor, a method for preparing a dielectric ceramic, and a method for preparing a dielectric ceramic using the dielectric ceramic. into multilayer ceramic capacitors. Background technique [0002] With the development of electronic technology in recent years, the miniaturization and increase in capacity of multilayer ceramic capacitors have been promoted. In this multilayer ceramic capacitor, the dielectric layer is thinned by embedding internal electrodes inside the ceramic sintered body. , Multi-layer, realize miniaturization and increase in capacity of multilayer ceramic capacitors. [0003] Furthermore, there has been proposed a dielectric ceramic composition which is composed of (Ba ...

Claims

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Application Information

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IPC IPC(8): C04B35/468H01B3/12H01G4/12
CPCC04B2235/3239C04B2235/3206C04B2235/3409C04B35/6303C04B2235/3215C04B35/4682C04B2235/3229C04B2235/3217H01G4/1227C04B2235/6582C04B2235/3213B32B2311/12C04B2235/3279C04B2235/96C04B2235/6584C04B2237/346C04B2235/3203C04B2235/3262C04B2235/3224C04B2235/3272C04B2237/407C04B2235/3418C04B2235/365B32B2311/22C04B2235/3208C04B2235/3251C04B2237/405C04B2235/3227C04B2235/6588C04B2235/3436C04B2235/3241C04B2235/3258C04B2235/3225C04B2235/3256C04B2235/3275H01B3/12H01G4/30
Inventor 加藤成中村友幸武藤和夫笹林武久佐野晴信
Owner MURATA MFG CO LTD
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