Sintering behavior and microwave properties of dense 0.7CaTiO₃-0.3NdAlO₃ ceramics with sub-micron sized grains by spark plasma sintering

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• 作者：Lijin Cheng^a ; Shaowen Jiang^a ; Qing Ma^b ; Zhengang Shang^c ; Shaojun Liu^a ; ^c ; ^d ; ^{liumatthew@csu.edu.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Spark plasma sintering ; Densification ; Microwave ceramics ; Submicron sized grains ; Dielectric loss
• 刊名：Scripta Materialia
• 出版年：2016
• 出版时间：1 April 2016
• 年：2016
• 卷：115
• 期：Complete
• 页码：80-83
• 全文大小：752 K

文摘

Using 0.7CaTiO₃–0.3NdAlO₃ ceramics as a model system, dense perovskite structure microwave ceramics with submicron (190–260 nm) sized grains are firstly and successfully prepared by spark plasma sintering. It is shown that the stripe-like Al-rich secondary phases are effectively suppressed due to significantly enhanced mass transfer by increasing the diffusion driving forces during the spark plasma sintering. 0.7CaTiO₃–0.3NdAlO₃ ceramics sintered at 1250 °C with 30 MPa and annealed in oxygen at 1000 °C for 12 h has 97.9% relative density and exhibits good microwave properties with ε_r = 46, Q · f = 32,000 GHz, τ_f = − 2.4 ppm/°C.