Microwave medium material of vacancy composite perovskite and preparation method
A technology of microwave dielectric material and composite perovskite, which is applied in the field of A-vacancy composite perovskite microwave dielectric material and its preparation, to achieve the effect of increasing Q value and reducing the temperature coefficient of resonance frequency
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Embodiment 1
[0033] Embodiment one: microwave dielectric material La (2-x) / 3 Na x TiO 3 (x=0.02,0.04,0.06,0.08,0.1,0.2,0.3,0.4,0.5) preparation method:
[0034] According to the chemical formula La (2-x) / 3 Na x TiO 3 (x=0.02, 0.04, 0.06, 0.08, 0.1, 0.2, 0.3, 0.4, 0.5), accurately weighed analytical reagent: TiO 2 (99.9wt%); La 2 o 3 (99.9wt%); Na 2 CO 3 (99.9wt%), pour in the resin ball mill tank, add deionized water and ZrO 2 Grinding balls; the weight ratio of the three is: material: ball: deionized water = 1:2:1; ball milling in the ball mill for 24 hours to ensure uniform mixing; After drying at 1100°C for 2 hours, the synthesized powder was ground with a mortar and passed through an 80-mesh sieve, then poured into a ball mill jar for secondary ball milling, and ball milled for 24 hours: material, The ratio of balls to water is 1:2:0.8; the material is discharged, and the slurry is dried and passed through a 40-mesh sieve to obtain a powder with uniform particle size; 7-10wt...
Embodiment 2
[0036] Embodiment two: adopt the method identical with embodiment one, can obtain chemical formula and be: (Nd 2 / 3-x Li 3x )TiO 3 (x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5) microwave dielectric materials, and the above materials are tested, the test results are shown in Figure 5, Figure 6, Figure 7, Figure 8. The above test results show that: when 0.2≤x≤0.5, the sintered sample exhibits a single perovskite phase, and when x≤0.1, a small amount of impurity Nd appears 2 Ti 2 o 7 and Nd 2 Ti 4 o 11 . Nd (2-x) / 3 Li x TiO 3 The degree of ordering of the A-sites decreases with the increase of x. Dielectric constant ε r As x increases, it first increases and then decreases, and has a maximum value at x=0.2. The Q×f value decreases with the increase of x, and the resonant frequency temperature coefficient τ f are negative, and τ f The absolute value increases as x increases. When x=0.2 and the sintering temperature is 1300°C, Nd (2-x) / 3 Li x TiO 3 Has good microwave dielectri...
Embodiment 3
[0037] Embodiment three: adopt the method identical with embodiment one, can obtain chemical formula and be: (Sm 2-x / 3 Li x )TiO 3(x=0.0, 0.1, 0.2, 0.3, 0.4, 0.5) microwave dielectric materials, and the above materials are tested, the test results are shown in Figure 9, Figure 10, Figure 11, Figure 12. The results show that the sample with x=0 cannot form a single-phase ceramic after sintering at 1325°C, but decomposes into Sm 2 Ti 2 o 7 phase and rutile phase TiO 2 . When 0≤x(2-x) / 3 Li x TiO 3 It is a multi-phase composite ceramic structure, and when 0.3≤x≤0.5, it is a single perovskite phase. Dielectric constant ε r As x increases, it first increases and then decreases, and the maximum value is 60.2 when x=0.3. The Q×f value increases with the increase of x. Resonant frequency temperature coefficient τ f Decreases with the increase of x, from positive value to negative value, when x=0.1, τ f The absolute value has a minimum value (τ f = -5ppm / °C). When x=0.3, ...
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