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首页> 外文期刊>Materials Science and Engineering >Sintering behavior, microstructure and microwave dielectric properties of Li_(2+x)TiO_3(0≤x≤0.2)
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Sintering behavior, microstructure and microwave dielectric properties of Li_(2+x)TiO_3(0≤x≤0.2)

机译：Li_（2 + x）TiO_3（0≤x≤0.2）的烧结行为，微观结构和微波介电性能

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摘要

Sintering behavior, microstructure and microwave dielectric properties of Li_(2+x)TiO_3(0≤x≤0.2) ceramics have been studied by X-ray diffraction (XRD), scan electron microscopy (SEM), Raman spectra, dilatometery and microwave resonant measurement in this research. Homogeneous non-stoichiometric composition with rock salt structure existed for Li_(2+x)TiO_3(0≤x≤0.2) ceramics. The sintering temperature was successfully reduced and highly densified sample could be obtained with appropriate excessive amount of lithium (x=0.08). A transient reactive liquid phase sintering mechanism was proposed. The preferred orientation of grain growth and micro-cracks existed in the Li_2TiO_3 (x=0) sample disappeared in the lithium excessive samples with x > 0.08. The microwave dielectric properties varied significantly with the excessive amount of lithium. Optimized microwave dielectric properties were obtained for the x = 0.08 composition: ε_r=24.6, Q×∫= 66,000 GHz, and τ_f = 22.1 ppm/℃
机译：通过X射线衍射（XRD），扫描电子显微镜（SEM），拉曼光谱，膨胀计和微波共振研究了Li_（2 + x）TiO_3（0≤x≤0.2）陶瓷的烧结行为，微观结构和微波介电性能。本研究中的测量。 Li_（2 + x）TiO_3（0≤x≤0.2）陶瓷中存在具有盐分结构的均相非化学计量组成。成功降低了烧结温度，并且可以通过添加适量过量的锂（x = 0.08）获得高致密化的样品。提出了一种瞬态反应液相烧结机理。 Li_2TiO_3（x = 0）样品中存在的晶粒长大和微裂纹的优选取向在锂过量样品中消失，x> 0.08。微波介电性能随锂的过量而显着变化。对于x = 0.08的成分，获得了优化的微波介电性能：ε_r= 24.6，Q×∫= 66,000 GHz和τ_f= 22.1 ppm /℃

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