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

Zhe Xiong | Zendy; Bin Tang | Zendy; Chengtao Yang | Zendy; Changlai Yuan | Zendy; Shuren Zhang | Zendy

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

Author(s) -

Zhe Xiong,

Bin Tang,

Chengtao Yang,

Changlai Yuan,

Shuren Zhang

Publication year - 2018

Publication title -

acs omega

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.779

H-Index - 40

ISSN - 2470-1343

DOI - 10.1021/acsomega.8b01311

Subject(s) - orthorhombic crystal system , ceramic , raman spectroscopy , materials science , perovskite (structure) , octahedron , analytical chemistry (journal) , dielectric , doping , oxygen , x ray photoelectron spectroscopy , crystallography , crystal structure , chemistry , metallurgy , nuclear magnetic resonance , physics , optics , optoelectronics , organic chemistry , chromatography

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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