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采用化学络合法将Nb_2O_5转化为可溶性铌盐作为铌源,分别用Li_2CO_3与Ti(OC_4H_9)_4作为Li源与Ti源,采用溶胶-凝胶法成功合成出Li_(1.075)Nb_(0.625)Ti_(0.45)O_3纳米粉体。采用XRD与SEM对粉体的相结构及微观形貌进行了分析,结果表明,当煅烧温度高于600℃时,可以获得结晶完整的,具有板状结构的Li_(1.075)Nb_(0.625)Ti_(0.45)O_3颗粒,其厚度为30~80 nm,宽度为100~300 nm。对煅烧后粉体所制备的Li_(1.075)Nb_(0.625)Ti_(0.45)O_3陶瓷样品的烧结性能与介电性能进行了研究,结果表明,随着烧结温度的提高,样品的密度与介电常数增大,当采用600℃煅烧的粉体时,在不添加任何烧结助剂的条件下,陶瓷样品在950℃烧结后能够达到96%的相对密度,介电常数为70,品质因数达到9200 GHz。
Li_ (1.075) Nb_ (0.625) Ti_ (1.05) Nb_2O_5 was successfully synthesized by sol-gel method using Li_2CO_3 and Ti (OC_4H_9) _4 as the source of Li and Ti, (0.45) O_3 nanopowder. The phase structure and the morphology of the powders were characterized by XRD and SEM. The results show that when the calcination temperature is higher than 600 ℃, the crystal structure of Li 1.075 Nb 0.625 Ti 6 (0.45) O_3 particles with a thickness of 30-80 nm and a width of 100-300 nm. The sintering properties and dielectric properties of Li 1.075 Nb 0.625 Ti 0.45 O 3 ceramics prepared by calcination were studied. The results show that with the increase of sintering temperature, When the sintering temperature is 600 ℃, the ceramic samples can reach the relative density of 96% after sintering at 950 ℃ with the dielectric constant of 70 and the quality factor of 9200 GHz.