A low-permittivity microwave dielectric ceramic with zero-frequency temperature coefficient and ultra-low loss and its preparation method
A technology of microwave dielectric ceramics and low dielectric constant, which is applied in the field of microwave dielectric ceramics, can solve problems such as being unable to meet actual needs and application requirements, and achieves continuously adjustable resonant frequency temperature coefficient, low dielectric constant, and satisfying The effect of communication needs
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[0027] As an example of the preparation method of microwave dielectric ceramics, high-purity (purity>99%) MgO, SiO 2 and Ta 2 o 5 As a raw material, it is calcined at 1000-1250°C (preferably 1000-1200°C) for 4-12 hours to synthesize Mg 2 SiO 4 Powder and MgTa 2 o 6 For powder, press xMg again 2 SiO 4 -(1-x)MgTa 2 o 6 Weighing the stoichiometric composition, adding B at a mass fraction of y wt% at the same time, adding a binder after crushing to granulate and shape to obtain a green body; sintering the obtained green body at 1350-1450°C for 4-16 hours to obtain the microwave dielectric ceramics.
[0028] The microwave dielectric properties of the prepared ceramics were tested. The diameter and thickness of the samples were measured using a micrometer. With the help of AgilentE8363A PNA network analyzer, the dielectric constant and dielectric loss of the prepared cylindrical ceramic materials were measured by the cavity method, and the test samples were placed in the ...
Embodiment 1
[0032] (1) MgO, Ta 2 o 5 , SiO 2 Molar ratio MgO:Ta respectively 2 o 5 = 1:1 and MgO:SiO 2 = 2:1 weighing, adding zirconia balls and deionized water. Ball mill for 1 to 2 hours, dry the ball-milled raw material in a drying oven, and then calcinate at 1100°C for 4 hours to synthesize MgTa 2 o 6 and Mg 2 SiO 4 ;
[0033] (2) The synthesized Mg 2 SiO 4 and MgTa 2 o 6 According to the mole fraction ratio of 0.4:0.6, 0.5:0.5, 0.6:0.4, 0.7:0.3, 0.8:0.2, weigh and put it into a ball mill jar with zirconia balls and deionized water, mill for 1 to 2 hours, and dry it to Adding mass fraction to the powder is 3% PVA (polyvinyl alcohol) to granulate as a binder, and press it into a cylindrical green body;
[0034] (4) Sinter the cylindrical green body at 1350°C for 8 hours to obtain the required composite microwave dielectric ceramics;
[0035] (5) Test the microwave dielectric properties of the composite microwave dielectric ceramic prepared in step (4) with a network anal...
Embodiment 2
[0039] Follow example 1, select x=0.6 component on the basis of example 1, add B substance content in (2) step and be 1wt%, all the other steps are identical with example 1, test result sees table 2 for details.
[0040] Table 2 is the experimental result involved in embodiment 2:
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