Structure and microwave dielectric properties of (1–x)Nd(Zn0.5Ti0.5)O3–xCa0.61Nd0.26TiO3 ceramics

Li, Jiamao; Fan, Chuangang; Ran, Songlin

doi:10.1016/j.ceramint.2015.08.154

Cited by 14 publications

(1 citation statement)

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“…The Ca 0.61 Nd 0.26 TiO 3 (CNT) ceramic with properties of ε r ∼ 108, Q × f ∼ 17 200 GHz, and τ f ∼ +270 ppm/°C, originating from CaTiO 3 ceramic is thought to be potential and suitable MWDCs applied in the high-frequency circuit . For the needs of practical application, many literatures concentrated on tuning the τ f value of the CNT ceramic to near zero by substitution of A or B site in perovskite structure , or combining other ceramics with opposite τ f value. − Nevertheless, little attention has been attached to the improvement on Q × f values by preventing reduction of Ti 4+ to Ti 3+ . Two valence states of Ti exist in many Ti-based MWDCs sintered in an air atmosphere or under low oxygen partial pressure, such as TiO 2 , BaZn 2 Ti 4 O 11 , Ba 4.2 Sm 9.2 Ti 18 O 54 , Na 0.5 Sm 0.5 TiO 3 , and so on.…”

Section: Introductionmentioning

confidence: 99%

Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value

et al. 2018

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We investigated the structure and antireduction of Ti 4+ in orthorhombic perovskite Ca 0.61 Nd 0.26 TiO 3 (CNT) ceramic by doping with three different additives (Cr 2 O 3 , MnO 2 , and SnO 2 ). The X-ray diffraction patterns showed that the main phase of orthorhombic perovskite was formed in all the samples. In addition, the substitution of M (M = Cr 3+ , Mn 4+ , Sn 4+ ) for Ti 4+ resulted in the oxygen octahedral distortion and changes of order degree of B-site, which was confirmed by Raman spectra. The ε r and τ f values were concerned with the average ionicity of B–O bond f i (B-ave) and the linear expansion coefficient α, respectively. The X-ray photoelectron spectra indicated that three different additives could restrain the reduction of Ti 4+ , which was beneficial to the improvement of the Q × f value for CNT ceramic. High Q × f value of 16 123 GHz was obtained in the CNT + 1 mol % Cr 2 O 3 ceramic compared with Q × f value of 11 207 GHz in pure CNT ceramic.

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