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[0007] However, as for the management level of the firing temperature of the tunnel-type large-scale firing furnace used in the mass production of multilayer ceramic capacitors, there is a problem that the variation of the maximum temperature during firing in the firing furnace is large, so it is easy to Variations in the grain growth of BCT crystal grains occur, and many products do not satisfy the range of relative permittivity, temperature characteristics, and high-temperature load test characteristics, and the yield rate in mass production decreases
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Embodiment 1
[0089]
[0090] A multilayer ceramic capacitor was fabricated as follows. Also, the A / B site ratio in the BT powder and BCT powder used here is 1.003. In addition, the particle size of the BT and BCT powders is 0.2 to 0.4 μm. The BT powder and the BCT powder were coated with Mg, Y, and Mn, respectively. The coating amount is set to MgO=0.022 mass parts with respect to 100 mass parts of BT powder, Y 2 o 3 =0.122 parts by mass, MnO=0.023 parts by mass, with respect to 100 parts by mass of BCT powder, set MgO=0.065 parts by mass, Y 2 o 3 =0.37 parts by mass, MnO=0.069 parts by mass.
[0091] Glass powder whose composition is SiO 2 =50, BaO=20, CaO=20, Li 2 O=10 (mol %), the average particle diameter was 0.5 μm, and the amount added was 1.2 parts by mass based on 100 parts by mass of the dielectric powder. Table 1 shows the alumina content in the glass powder used in this case. In addition, the amount of added barium carbonate is also shown in Table 1. In addition, Tab...
Embodiment 2
[0122] Multilayer ceramic capacitors (sample Nos. 8 to 12 in Table 2) were produced in the same manner as in Example 1 above except that barium carbonate having the specific surface area shown in Table 2 was used. Next, for the obtained multilayer ceramic capacitor, A was measured in the same manner as in Example 1. BT / A BCT , the result is 0.8~1.2. In addition, the concentration gradient has a concentration gradient of 0.05 atomic % / nm or more.
[0123] Next, for these multilayer ceramic capacitors (sample Nos. 8 to 12 in Table 2), in the same manner as in the above-mentioned Example 1, the capacitance, relative permittivity, temperature characteristics of relative permittivity, and breakdown voltage were measured. (BDV), X7R standard, high temperature load test (MTTF, impedance method), average grain size (average value, D90) and grain boundary phase evaluation (triple point grain The presence or absence of Si-Ba-O compounds on the boundary · elemental analysis on the gr...
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Abstract
This invention provides a laminated ceramic capacitor comprising a capacitor body. The capacitor body comprises alternately stacked dielectric layers and inner electrode layers. The dielectric layer comprises a plurality of crystal grains and a grain boundary phase. The grain boundary phase comprises interfacial grain boundaries and triple point grain boundaries formed by the plurality of crystal grains adjacent to each other. An Si-Ba-O compound is formed at the triple point grain boundaries in a proportion of not less than 5% of the total number of triple point grain boundaries per unit area of the dielectric layer. Thus, a laminated ceramic capacitor, which has high specific permittivity and is excellent in temperature characteristics and high-temperature load test properties, can be provided.
Description
technical field [0001] The present invention relates to a multilayer ceramic capacitor and a manufacturing method thereof, and more particularly to a small, high-capacity and highly reliable multilayer ceramic capacitor having a dielectric layer formed by adding a glass component to a dielectric material and a manufacturing method thereof. Background technique [0002] Recently, with the popularization of mobile communication equipment such as mobile phones and the increase in speed and frequency of semiconductor devices, which are the main components of microcomputers, etc., there is an increasing demand for miniaturization and high-capacity multilayer ceramic capacitors mounted on these electronic equipment. higher. For this reason, the dielectric layers constituting the multilayer ceramic capacitor are made thinner and multilayered. [0003] For example, in Patent Document 1, regarding the dielectric powder constituting the dielectric ceramic, there are barium titanate p...
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