Semiconductor ceramic composition and method for producing the same
A ceramic composition and semiconductor technology, which is applied in the direction of resistors with positive temperature coefficients, etc., can solve problems such as environmental pollution, and achieve the effects of reducing room temperature resistance, inhibiting the formation of different phases, and inhibiting composition changes.
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
preparation example Construction
[0053] In the step of preparing BNT calcined powder in the separate calcination method, Na 2 CO 3 、 Bi 2 o 3 and TiO 2 The raw material powders are mixed to prepare mixed raw material powders. In this step, after adding too much Bi 2 o 3 (for example, in an amount greater than 5 mol %), this is disadvantageous since different phases may form during calcination and the room temperature resistance may increase.
[0054] Then, the mixed raw material powder is calcined. The calcination temperature is preferably in the range of 700°C to 950°C. The calcination time is preferably 0.5 hours to 10 hours, more preferably 2 hours to 6 hours. When the calcination temperature is lower than 700°C or the calcination time is less than 0.5 hours, 2 CO 3 Or NaO generated by decomposition may react with water in the environment or a solvent in the case of wet mixing, thereby disadvantageously causing a change in composition or a change in characteristics. On the other hand, when the c...
Embodiment 1
[0068] Preparation of BaCO 3 、TiO 2 and La 2 o 3 The starting material powder and compounded as (Ba 0.994 La 0.006 )TiO 3 , followed by mixing in distilled water. The obtained mixed material powder was calcined in air at 500°C to 1300°C for 4 hours to obtain (BaLa)TiO 3 Calcined powder. figure 1 Represents (BaLa)TiO 3 X-ray diffraction patterns of calcined powders at various calcination temperatures ranging from 500 °C to 1200 °C. Although no temperature indication is given to the X-ray diffraction pattern of the lowermost figure, this pattern corresponds to the case where the temperature indication is 500°C.
[0069] Depend on figure 1 It is clearly visible that (BaLa)TiO calcined at 1000°C or higher 3 No residual BaCO in the powder 3 and TiO 2 , and a completely single-phase (BaLa)TiO is formed in 3 .
[0070] Preparation of Na 2 CO 3 、 Bi 2 o 3 and TiO 2 The starting material powder and compounded as (Bi 0.5 Na 0.5 )TiO 3, followed by mixing in ethano...
Embodiment 2
[0076] Preparation of BaCO 3 、TiO 2 and Nb 2 o 5 The starting material powder and compounded as Ba(Ti 0.998 Nb 0.002 )O 3 , followed by mixing in pure water. The obtained mixed material powders were calcined in air at 1000 °C for 4 hours to obtain Ba(TiNb)O 3 Calcined powder.
[0077] Preparation of Na 2 CO 3 、 Bi 2 o 3 and TiO 2 The starting material powder and compounded as (Bi 0.5 Na 0.5 )TiO 3 , followed by mixing in ethanol. The obtained mixed material powders were calcined in air at 800 °C for 2 hours to obtain (BiNa)TiO 3 Calcined powder.
[0078] Ba(TiNb)O prepared in this way 3 Calcined powder and (BiNa)TiO 3 The calcined powder was compounded at a molar ratio of 73 / 7, and then the amount of BaCO shown in Table 2 was added 3 Powder and TiO 2 powder. Using pure water as a medium, they were mixed and crushed in a ball mill to obtain a mixed calcined powder having an average particle size of 1.0 μm to 2.0 μm, followed by drying. The PVA was added t...
PUM
| Property | Measurement | Unit |
|---|---|---|
| Curie point | aaaaa | aaaaa |
| density | aaaaa | aaaaa |
Abstract
Description
Claims
Application Information
Login to View More