Structure and microwave dielectric properties of (1-x)Nd(Zn_0.5Ti_0.5)O₃-xCa_0.61Nd_0.26TiO₃ ceramics

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• 作者：Jiamao Li ; ^{agdjiamaolee@126.com" class="auth_mail" title="E-mail the corresponding author} ; Chuangang Fan ; Songlin Ran
• 关键词：D. Perovskite ; Nd(Zn0.5Ti0.5)O3 ; Ca0.61Nd0.26TiO3 ; Structure ; Microwave dielectric properties
• 刊名：Ceramics International
• 出版年：2016
• 出版时间：January 2016
• 年：2016
• 卷：42
• 期：1
• 页码：607-614
• 全文大小：1315 K

文摘

Structure and microwave dielectric properties of (1−x)Nd(Zn_0.5Ti_0.5)O₃–xCa_0.61Nd_0.26TiO₃ (0.2≤x≤0.8) ceramics prepared by the conventional solid-state reaction route were investigated in detail. It was found that the crystal structure and microwave dielectric properties depended strongly on Ca_0.61Nd_0.26TiO₃ content. In the whole investigated compositional range, the complete solid solutions with perovskite structure were formed together with a small amount of Zn₂TiO₄ secondary phase. However, a phase transformation from monoclinic to orthorhombic structure was also observed when x>0.6, accompanying with the disappearance of cation ordering. With the increase of Ca_0.61Nd_0.26TiO₃ addition, both the grain size and the dielectric constant (ε_r) increased. The quality factor (Q×f) was closely related to the grain size and cation ordering of the ceramics. The drastic drop in the temperature coefficient of resonant frequency (τ_f) might be attributed to the elimination of cation ordering. After being sintered at 1375 °C for 4 h, 0.4Nd(Zn_0.5Ti_0.5)O₃–0.6Ca_0.61Nd_0.26TiO₃ exhibited high density, uniform microstructure and excellent microwave dielectric properties of ε_r=56.3, Q×f= 54,400 GHz and τ_f=+0.3 ppm/°C.