A positive linear capacity temperature change rate medium material and its preparation method

Abstract

The invention discloses a medium material with a positive linear capacity temperature change rate and a preparation method thereof. The medium material uses [(1-x)BaTiO3-xBiyNazTiO3] as a base material and adds Nb2O5, RE2O3, MnCO3, and BiBO3; wherein: x= 0.05‑0.15, y=0.4‑0.6, z=0.4‑0.6, the molar ratio of BaTiO3 and BiyNazTiO3 in [(1‑x)BaTiO3‑xBiyNazTiO3] is (1‑x):x; RE is Sm, Er or Ce One or more of them; the dielectric material suitable for positive linear capacity temperature change rate multilayer ceramic capacitor provided by the present invention has low dielectric loss, working temperature range (-55°C-150°C), and good temperature stability ( ‑15%≤ΔC / C≤15%), the temperature change within the working temperature range is a positive linear change, etc. The present invention can be used to design a capacity temperature compensation capacitor within the temperature range (-55°C-150°C), compensate for the negative effect caused by the temperature rise of the capacitor in the functional circuit, and balance the charge capacity of the entire temperature range, thereby improving the stability and reliability of the circuit sex. It has extremely high industrialization prospect and 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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