Microwave dielectric procelain composition and dielectric resonator
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A technology of dielectrics and compositions, applied in resonators, waveguide devices, ceramics, etc., can solve problems such as Qu reduction
Inactive Publication Date: 2004-02-18
MARUWA
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In addition, especially in the case where the dielectric ceramic composition is to be applied to a large-scale dielectric resonator, if the entire dielectric ceramic composition does not become a sufficiently sintered homogeneous product, there is a problem that Qu will decrease, etc.
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Embodiment 1
[0031] (1) Preparation of test piece
[0032] According to the ratio shown in Table 1, TiO 2 Powder (purity: 99.99%), CaCO 3 Powder (purity: 99.9%), La 2 o 3 Powder (purity: 99.9%), Nd 2 o 3 Powder (purity: 99.9%), Sm 2 o 3 Powder (purity: 99.9%), Al 2 o 3 powder (purity: 99.95%), and Ta 2 o 5 Powder (purity: 99.2%) was mixed. Then, dry mixing (20 to 30 minutes) was performed in a mixer, and then crushing was performed once. Then, provisional sintering is performed at 1100 to 1300° C. for 2 hours in the air atmosphere. Then, an organic binder and water were added to the temporarily sintered powder, and pulverization was carried out at 90 rpm for 10 to 15 hours using zirconia balls with a diameter of 10 mm. Then, granulate by vacuum freeze-drying (vacuum degree is about 0.4 Torr, freezing temperature is -20~-40°C, drying temperature is 40~50°C, vacuum drying time is about 20 hours), and the raw material after granulation is used , with 1 ton / cm 2 stamping, formin...
Embodiment 2
[0042] (1) Production of test piece and dielectric resonator
[0043] CaCO 3 Powder (purity: 99.9%), TiO 2 Powder (purity: 99.95%), Al 2 o 3 powder (purity: 99.95%), Ln oxide powder (purity: 99.95%) described in Table 2 and Table 3, Na 2 CO 3 Powder (purity: 99.5%), Ta 2 o 5 powder (purity: 99.95%), and MnO 2 Powder (purity: 99.9%) is the raw material powder, so that the molar ratio of x, Ln and Na 2 O. Ta 2 o 5 and MnO 2 The content of the mixture is formulated as shown in Table 2 and Table 3, and after dry mixing with a stirrer for 20 to 30 minutes, primary pulverization is performed by a vibrating mill. Alumina balls were used as the grinding balls, and the pulverization time was set to 4 hours.
[0044] In the air atmosphere, at 1100-1300 ℃, temporarily sinter the obtained powder for 2 hours, add an appropriate amount of organic binder and water to the temporarily sintered powder, and carry out 10-15 hours of secondary sintering with a drum sieve pulverizer. T...
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Abstract
The present invention relates to a microwave dielectric ceramic composition exhibiting excellent dielectric characteristics, including high Qu; and to a dielectric resonator which exhibits high Qu even when of large size. The present invention provides a microwave dielectric ceramic composition containing a primary component represented by CaTiO3-(1-x)REAlO3 (0.54 <= x <= 0.82) (wherein RE is composed only of an essential element La or composed of an essential element La and one or two optional elements selected from among Nd and Sm). The present invention also provides a microwave dielectric ceramic composition containing a primary component represented by the compositional formula: xCaTiO3-(1-x)LnAlO3 (0.54 <= x <= 0.82) (wherein Ln is at least one species selected from among Y, La, Nd, Sm, etc.); and Na in an amount as reduced to Na2O of 0.02 to 0.5 parts by mass on the basis of 100 parts by mass of the primary component. The present invention also provides a dielectric resonator produced from the aforementioned microwave dielectric ceramic composition.
Description
technical field [0001] The present invention relates to a novel microwave dielectric ceramic composition (hereinafter referred to as "dielectric ceramic composition") containing a component having a specific crystal structure and a dielectric resonator formed therefrom. The dielectric porcelain composition of the present invention can be used as a microwave integrated circuit substrate, impedance matching components of various microwave circuits, etc., in addition to dielectric resonators and filters in the microwave field. Background technique [0002] Can be used to make the CaTiO 3 Al 2 o 3 , MnO 2 The method of oxides such as etc. is obtained in the microwave field and has practically sufficient relative permittivity (hereinafter, use "ε r "Indicated) and no-load quality factor (hereinafter, expressed by "Qu"), temperature coefficient of resonant frequency (hereinafter, expressed by "τ f ” indicates a dielectric ceramic composition with a small absolute value, which...
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