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[0005] On the other hand, after thinning the dielectric layer, since a voltage with a high electric field strength is applied to the dielectric layer, it may cause a decrease in the dielectric constant and a deterioration in temperature characteristics, and due to long-term driving at high temperature The insulation resistance is reduced, and defective products are easily produced, resulting in reduced reliability.
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Embodiment 1
[0102] [production of sample]
[0103] [Sample No. 1]
[0104] Prepare BaCO 3 、TiO 2 and NiO as ceramic raw materials, and weigh these ceramic raw materials so that the molar ratio m of Ba and Ti is 1.010, and relative to 100 mole parts of BaTiO 3 , the mole fraction a of NiO is 1.0.
[0105] Next, this weighed object was put into a ball mill together with PSZ balls and pure water, wet mixed and pulverized for 48 hours, and then calcined at a temperature of 1100° C. to produce a calcined powder.
[0106] Next, prepare Dy 2 o 3 , MnCO 3 , MgCO 3 and SiO 2 as an additive material. Then, these additive materials are weighed so that the dielectric ceramic satisfies the following general formula (B).
[0108] Next, these additive materials were put into a ball mill together with the above-mentioned calcined powder, wet-mixed in the ball mill for 24 hours, and then evaporated and dried to obt...
Embodiment 2
[0148] [production of sample]
[0149] [Sample No. 11 to 18]
[0150] A ceramic raw materialpowder having the same composition as Sample No. 1 was produced to obtain a ceramic laminate.
[0151] Next, the ceramic laminate was subjected to a binder removal treatment at a temperature of 300° C., and further, after controlling the oxygenpartial pressure to 10 -10 ~10 -12 H in MPa 2 -N 2 -H 2 In a reducing environment composed of O gas, firing treatment was performed on each sample at different temperatures in the range of 1140 to 1280° C. for about 2 hours to obtain multilayer ceramic capacitors with sample numbers 11 to 18.
[0152] [Sample No. 19-26]
[0153] Multilayer ceramic capacitors of sample numbers 19 to 26 having different firing temperatures were obtained by the same method and procedure as sample numbers 11 to 18 except that NiO was not added.
[0155] For each sample of sample numbers 11 to 26, the struct...
Embodiment 3
[0174] [production of sample]
[0175] Prepare BaCO 3 、TiO 2 and NiO as ceramic raw materials, and these ceramic raw materials are weighed so that the molar ratio m of Ba and Ti and relative to 100 mole parts of BaTiO 3 The mole fraction a of NiO was the value shown in Table 5, and the calcined powder was produced in the same method and procedure as in [Example 1].
[0176] Next, prepare R oxide containing rare earth element R (La 2 o 3 , CeO 2 、Pr 6 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 , Y 2 o 3 ), M oxides containing metal elements M (MnO, Fe 2 o 3 , CuO, CoO, V 2 o 5 、WO 3 、Cr 2 o 3 、MoO 2 、Al 2 o 3 ), MgO and SiO 2 as an additive material.
[0177] Next, these additive materials were weighed so that b, c, d, and e represented by the following general formula (C) of the dielectric ceramics had the values shown in Table 5.
[0178] 100Ba m TiO 3 +aNi...
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Abstract
A dielectricceramic contains a BaTiO3-based compound as a main ingredient, and can be represented by the general formula: 100AmBO3+aNiO+bROn+cMOv+dMgO+eXOw where R represents a rare earth element such as Dy, M represents a metal element such as Mn, and X represents a sintering aid component containing Si. Ni is uniformly solid-solved in crystal grains, and the solid-solution region of the rare earth element in the crystal grains is an average 10% or less in terms of a cross section ratio. 0.96≰m≰1.030, 0.05≰a≰3, 0.1≰b≰1.5, 0.1≰c≰1.0, 0.1≰d≰1.5, and 0.05≰e≰3.5 are satisfied. A laminated ceramiccapacitor has dielectriclayers formed of the dielectricceramic. As a result, a dielectric ceramic, and a laminated ceramic capacitor having excellent AC voltage characteristics, capable of keeping desired dielectric characteristics and excellent temperature characteristics, and having excellent withstand voltage and capable of ensuring reliability can be realized.
Description
[0001] This application is a divisional application, the application number of its parent application: 200880108059.5 (PCT / JP2008 / 063587), the filing date: 2008.7.29, the invention name: dielectric ceramics and laminated ceramic capacitors technical field [0002] The present invention relates to a dielectric ceramic (dielectric ceramic) and a multilayer ceramic capacitor. More specifically, the present invention relates to a dielectric ceramic suitable for a dielectric material of a small-sized and large-capacity multilayer ceramic capacitor, and to using the dielectric ceramic. Manufactured multilayer ceramic capacitors. Background technique [0003] Multilayer ceramic capacitors are electronic components used in circuits of various electronic devices, and with miniaturization of electronic devices, miniaturization of multilayer ceramic capacitors is required. [0004] This type of multilayer ceramic capacitor is formed by laminating dielectric layers with internal electro...
Claims
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