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High-performance rock salt structure dielectric material and preparation method thereof
The invention belongs to the technical field of electronic ceramic materials, and discloses a high-performance rock salt structure dielectric material and a preparation method thereof, the chemical formula is Li3Mg2Nb1-x(Ti1/2W1/2)xO6, and x is greater than or equal to 0.02 and less than or equal to 0.08. The preparation method comprises the following steps: by adopting a solid-phase synthesis method, mixing Li2CO3, MgO, Nb2O5, TiO2 and WO3 according to a stoichiometric ratio, carrying out ball milling, drying, sieving and presintering to obtain presintered powder, performing ball milling again, drying, sieving and granulating, pressing into a green body, sintering the green body, keeping the temperature, and cooling to room temperature to obtain the required microwave dielectric ceramic.According to the invention, (Ti1/2W1/2)<5+> is used for replacing Nb<5+> in Li3Mg2NbO6, the stability of a Ti-O bond and a W-O bond is higher than that of an Nb-O bond, therefore, the obtained dielectric material is high in quality factor and good in microwave dielectric property, the dielectric constant epsilon r is 12-15, the quality factor Q*f is 80000GHz-130000GHz, and the temperature coefficient tau f of resonance frequency is -23ppm/DEG C to -20ppm/DEG C, and the preparation method is simple and easy for industrial production.
本发明属于电子陶瓷材料技术领域，公开了一种高性能岩盐结构介质材料及其制备方法，化学式为LiMgNb(TiW)O，其中0.02≤x≤0.08；采用固相合成法，将LiCO、MgO、NbO、TiO、WO按化学计量比混合；经球磨、烘干、过筛后预烧得到预烧粉末；再次球磨、烘干、过筛后进行造粒，再压制成坯体；坯体烧结，保温后降至室温制得所需微波介质陶瓷。本发明采用(TiW)取代LiMgNbO中的Nb，由于Ti‑O键和W‑O键稳定性高于Nb‑O键，因此，所得介质材料品质因数较高，具有良好的微波介电性能，介电常数ε为12～15，品质因数Q×f为80000GHz～130000GHz，谐振频率温度系数τ为‑23ppm/℃～‑20ppm/℃；并且制备方法简单，易于工业化生产。
High-performance rock salt structure dielectric material and preparation method thereof
The invention belongs to the technical field of electronic ceramic materials, and discloses a high-performance rock salt structure dielectric material and a preparation method thereof, the chemical formula is Li3Mg2Nb1-x(Ti1/2W1/2)xO6, and x is greater than or equal to 0.02 and less than or equal to 0.08. The preparation method comprises the following steps: by adopting a solid-phase synthesis method, mixing Li2CO3, MgO, Nb2O5, TiO2 and WO3 according to a stoichiometric ratio, carrying out ball milling, drying, sieving and presintering to obtain presintered powder, performing ball milling again, drying, sieving and granulating, pressing into a green body, sintering the green body, keeping the temperature, and cooling to room temperature to obtain the required microwave dielectric ceramic.According to the invention, (Ti1/2W1/2)<5+> is used for replacing Nb<5+> in Li3Mg2NbO6, the stability of a Ti-O bond and a W-O bond is higher than that of an Nb-O bond, therefore, the obtained dielectric material is high in quality factor and good in microwave dielectric property, the dielectric constant epsilon r is 12-15, the quality factor Q*f is 80000GHz-130000GHz, and the temperature coefficient tau f of resonance frequency is -23ppm/DEG C to -20ppm/DEG C, and the preparation method is simple and easy for industrial production.
本发明属于电子陶瓷材料技术领域，公开了一种高性能岩盐结构介质材料及其制备方法，化学式为LiMgNb(TiW)O，其中0.02≤x≤0.08；采用固相合成法，将LiCO、MgO、NbO、TiO、WO按化学计量比混合；经球磨、烘干、过筛后预烧得到预烧粉末；再次球磨、烘干、过筛后进行造粒，再压制成坯体；坯体烧结，保温后降至室温制得所需微波介质陶瓷。本发明采用(TiW)取代LiMgNbO中的Nb，由于Ti‑O键和W‑O键稳定性高于Nb‑O键，因此，所得介质材料品质因数较高，具有良好的微波介电性能，介电常数ε为12～15，品质因数Q×f为80000GHz～130000GHz，谐振频率温度系数τ为‑23ppm/℃～‑20ppm/℃；并且制备方法简单，易于工业化生产。
High-performance rock salt structure dielectric material and preparation method thereof
一种高性能岩盐结构介质材料及其制备方法
ZHANG PING (author) / SUN KEXIN (author)
2020-06-19
Patent
Electronic Resource
Chinese
IPC:
C04B
Kalk
,
LIME
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