Dielectric ceramics and multi-layer ceramic capacitor
A technology of ceramic capacitors and dielectric ceramics, applied in the direction of multilayer capacitors, capacitors, fixed capacitors, etc., can solve problems such as reliability reduction, and achieve the effect of improving reliability
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Embodiment 1
[0032] Prepare BaCO 3 、TiO 2 , ZrO 2 、Gd 2 o 3 , MgO as the starting material to obtain the sintered body of the composition of Table 1. In addition, in Table 1, Ba, Ti, and Zr are represented by the ratio when Ti+Zr is 100.
[0033] [Table 1]
[0034] Sample No
[0035] *outside the scope of the invention
[0036] Using a ball mill, the prepared BaCO 3 、TiO 2 , ZrO 2 Wet mixing was carried out, and after drying, it was calcined at 1100°C to obtain a barium titanate-based solid solution. Next, Gd was added to this barium titanate-based solid solution so that the composition shown in Table 1 was obtained. 2 o 3 , MgO, MnO, and SiO 2 , using a ball mill for wet mixing, drying and pre-calcining at 900°C to obtain dielectric ceramic powder. In addition, in Table 1, the sintering aid is represented by the weight part with respect to 100 weight part of barium titanate based solid solutions.
[0037] Polyvinyl butyral, an organic solvent, and a plasticizer a...
Embodiment 2
[0042] In the same manner as in Example 1, a dielectric ceramic powder was formed to obtain a sintered body having the composition shown in Table 3. Here, the effect was verified by increasing the amount of Re added.
[0043] [table 3]
[0044] Sample No
[0045] * outside the scope of the invention
[0046] The dielectric ceramic powder was formed into a multilayer ceramic capacitor in the same manner as in Example 1, and εr, tanδ, temperature characteristics, and average life were measured, and are summarized in Table 4.
[0047] [Table 4]
[0048] Sample No
[0049] According to the above results, if the composition ratio of Re, that is, a is in the range of 0.05≤a≤0.25, high reliability, temperature characteristics of the dielectric constant satisfying the X6S characteristic, and a dielectric constant in the range of 250 to 850 can be obtained. The inner dielectric ceramic and the Ni inner electrode multilayer ceramic capacitor.
Embodiment 3
[0051] Dielectric ceramic powder was formed in the same manner as in Example 1 to obtain a sintered body having the composition shown in Table 5. Here, the effect was verified by increasing the amount of M added.
[0052] [table 5]
[0053] Sample No
[0054] * outside the scope of the invention
[0055] The dielectric ceramic powder was formed into a multilayer ceramic capacitor in the same manner as in Example 1, and εr, tanδ, temperature characteristics, and average life were measured, and are summarized in Table 6.
[0056] [Table 6]
[0057]
[0058] According to the above results, if the composition ratio of M, that is, b is in the range of 0.05≤b≤0.25, high reliability, temperature characteristics of the dielectric constant satisfying the X6S characteristic, and a dielectric constant in the range of 250 to 850 can be obtained. The inner dielectric ceramic and the Ni inner electrode multilayer ceramic capacitor.
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Abstract
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