Dielectric material with positive linear capacitance temperature change rate, and preparation method thereof

Abstract

The invention discloses a dielectric material with a positive linear capacitance temperature change rate, and a preparation method thereof. According to the preparation method, [(1-x)BaTiO3-xBiyNazTiO3] is taken as a base material, and Nb2O5, RE2O3, MnCO3, and BiBO3 are added, wherein x=0.05-0.15, y=0.4=0.6, z=0.4-0.6, molar ratio of BaTiO3 to BiyNazTiO3 is (1-x):x, and RE is used for representing one or a plurality of elements selected from Sm, Er, or Ce. The dielectric material is suitable for preparing multilayer ceramic capacitors with a positive linear capacitance temperature change rate, and is low in dielectric loss; working temperature ranges from -55 to 150 DEG C, temperature stability is excellent (-15%<=delta C / C<=15%), and temperature changing accords with positive linear changing in the working temperature range. In the temperature range ranging from -55 to 150 DEG C, capacitance temperature compensating capacitors can be prepared from the dielectric material, compensating of negative effects caused by capacitor temperature increasing in functional circuits is realized, balancing of charge capacity in the whole temperature section is realized, and circuit stability and reliability are improved. The dielectric material possesses a promising industrialization prospect, and extremely high industrial application value.

Description

technical field [0001] The invention relates to the technical field of functional ceramic materials, in particular to a positive linear capacity temperature change rate dielectric material and a preparation method thereof. Background technique [0002] At present, the second type of ceramic capacitors are commonly used in circuit design. Due to the large dielectric loss of the selected ceramics, and the capacity-temperature curve within the operating temperature range is nonlinear, especially when the capacity-temperature curve of the selected ceramic capacitor has a negative temperature change , with the continuous exchange of charges in the circuit, the capacitor itself will generate heat, causing the temperature of the capacitor itself to rise, thereby causing the capacity of the capacitor to decrease. When selecting a capacitor normally, the capacitance value at room temperature is generally used as the design basis. If the capacitance value of the capacitor decreases in...

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Problems solved by technology

[0002] At present, the second type of ceramic capacitors are commonly used in circuit design. Due to the large dielectric loss of the selected ceramics, and the capacitance-temperature curve within the operating temperature range is nonlinear, especially when the capacitance-temperature curve of the selected ceramic capacitor has a negative temperature change. , with the continuous exchange of charges in the circuit, the capacitor itself will generate heat, causing the temperature of the capacitor itself to rise, thereby causing the capacity of the capacitor to decrease

When selecting capacitors normally, the capacitance value at room temperature is generally used as the design basis. If the capacitance value of the capacitor decreases in the high temperature stage, it will inevitably affect the performance of the circuit.

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