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Effects of La2O3 additions on properties of Ba0.6Sr0.4TiO3–MgO ceramics for phase shifter applications by Xiaohong Wang; Wenzhong Lu; Jian Liu; Yanling Zhou; Dongxiang Zhou is a Materials Science article available to read on EtoBox.

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Influence of La 2 O 3 additions on the microwave dielectric properties of Ba 0.6 Sr 0.4 TiO 3 (BST) mixed with magnesium oxide (w = 60%) composites was investigated. With increasing quantities of lanthanum oxide x (wt%), the lattice constant of BST-MgO material decreases to a minimum at x = 0.4 and then increases up to a maximum at x = 1.0. The XRD patterns analysis reveal that the solubility of MgO in BST is influenced by the amount of La 2 O 3 doping. SEM observations show that the BST grain sizes decrease with increasing amounts of La 2 O 3 . The dielectric properties of BST-MgO-La 2 O 3 indicate that La 2 O 3 additives shift the Curie point towards lower temperatures. Optimum doping amount of La 2 O 3 can reduce the high frequency loss tangents of BST-MgO compound which also can ensure the moderate dielectric constant and tunability. Excessive doping of La 2 O 3 tends to significantly lower dielectric constant and deteriorate tunability. When the doping amount of La 2 O 3 is 0.2 wt%, BST-MgO composite has the following properties: dielectric constant = 94.05, tan δ = 0.012 (at 2.853 GHz) and the dielectric constant tunability = 16.26% (under electric field 3.57 kV/mm), which is

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Author

Xiaohong Wang; Wenzhong Lu; Jian Liu; Yanling Zhou; Dongxiang Zhou

Publisher

Elsevier Science; Elsevier ; Elsevier BV (ISSN 0955-2219)

Published

2006

Language

EN

Field

Materials Science (Physical Sciences)