Dielectric ceramic composition and electronic component
A technology of ceramic composition and electronic components, applied in the direction of ceramics, inorganic insulators, etc., can solve the problems of not being able to effectively adapt to the miniaturization and complexity of circuits, not being able to fully suppress self-heating, not being able to adapt to lower prices, etc., to reach the capacity temperature Excellent characteristics and relative permittivity, excellent capacity temperature characteristics, and high relative permittivity
Inactive Publication Date: 2010-09-15
TDK CORPARATION
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Problems solved by technology
However, the dielectric loss at 1 MHz exhibited by this dielectric ceramic composition is as high as about 0.1 (10%) at best, and self-heating cannot be sufficiently suppressed.
Therefore, the dielectric ceramic composition cannot effectively adapt to the miniaturization and complexity of circuits in medium and high voltage applications.
[0009] Moreover, the dielectric ceramic composition contains bismuth and cannot meet the demand for price reduction
Method used
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[0050] Hereinafter, the present invention will be described based on further detailed examples, but the present invention is not limited to these examples.
[0051] Example
[0052] First, as the main component raw material, prepare SrCO 3 、BaCO 3 and TiO 2 . Furthermore, CaTiO was prepared as an auxiliary component raw material 3 , oxides or carbonates of element A (MnCO 3 、Cr 2 o 3 ), CuO, Fe 2 o 3 、Co 3 o 4 , NiO, ZnO, oxides of D elements (where D is La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho and Y). And, CaTiO 3 Prepared as follows. First, the CaCO 3 Raw materials and TiO 2 The raw materials were wet-mixed, and the dried raw materials were calcined in air at 1000° C. for 2 hours. The calcined raw material is further wet crushed to obtain CaTiO 3 .
[0053] Next, the raw materials of the main components were weighed to form the compositions shown in Table 1, and wet-mixed by a ball mill using water as a solvent. Next, after the obtained mixture was dried, ...
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Abstract
The dielectric ceramic composition comprising a main component including a compound satisfying a compositional formula of (SrxBa1-x)mTiO3 (''x'' in said compositional formula is 0.159!<=''x''!<=0.238, and ''m'' is 0.997!<=''m''!<=1.011), and a subcomponent comprising 11 to 25 weight % of CaTiO3, 0.10 to 0.50 weight % of at least one oxide of element selected from the group consisting of Fe, Co, Ni, Cu, and Zn in terms of FeO3 / 2, CoO4 / 3, NiO, CuO, and ZnO, 0.590 to 1.940 mol % of an oxide of element ''A'' (A is Mn and / or Cr), and an oxide of element ''D'' where ''D'' is at least one element selected from a group consisting of La, Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, and Y; wherein a ratio (A / D) of the element ''A'' with respect to element ''D'' is 2.250 to 7.450. According to the present invention, the dielectric loss (tan [delta]) at the wide frequency range can be lowered while maintaining a good capacitance temperature characteristic and the specific permittivity, without including Pb and bismuth Bi.
Description
technical field [0001] The present invention relates to a dielectric ceramic composition used for a dielectric layer of an electronic component and the like. In more detail, it relates to a dielectric ceramic composition which does not contain lead (Pb) which is an environmental load substance and bismuth (Bi) which increases resource prices, and which can be used in a wide frequency range, and an electronic component using the same. The dielectric loss is reduced, thereby having a higher dielectric constant, and at the same time, the temperature characteristic is better, and it can be provided at a cheap price. Background technique [0002] In recent years, the environmental protection movement on a global scale has been increasing, and the reduction of environmental load substances such as lead (Pb) has also been demanded in the field of electronic components. Therefore, it is desired to develop a dielectric ceramic composition that does not contain lead (Pb) and has prop...
Claims
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IPC IPC(8): C04B35/465H01B3/12
CPCC04B2235/3281C04B2235/3284C04B2235/3229C04B35/4682C04B2235/79C04B2235/3208C04B2235/3277C04B2235/3213C04B2235/3227C04B2235/3279C04B2235/3241C04B2235/3262C04B2235/3224C04B2235/3272C04B2235/3225C04B2235/3236
Inventor 梅田裕二张帆
Owner TDK CORPARATION