Different Additives Doped Ca–Nd–Ti Microwave Dielectric Ceramics with Distorted Oxygen Octahedrons and High Q × f Value
| Autor: | Chengtao Yang, C. L. Yuan, Bin Tang, Zhe Xiong, Shuren Zhang |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2018 |
| Předmět: |
Materials science
General Chemical Engineering Analytical chemistry chemistry.chemical_element 02 engineering and technology 010402 general chemistry 01 natural sciences Oxygen Article lcsh:Chemistry symbols.namesake Phase (matter) Ceramic Perovskite (structure) Doping General Chemistry 021001 nanoscience & nanotechnology 0104 chemical sciences Octahedron chemistry lcsh:QD1-999 visual_art visual_art.visual_art_medium symbols Orthorhombic crystal system 0210 nano-technology Raman spectroscopy |
| Zdroj: | ACS Omega, Vol 3, Iss 9, Pp 11033-11040 (2018) ACS Omega |
| ISSN: | 2470-1343 |
| Popis: | We investigated the structure and antireduction of Ti4+ in orthorhombic perovskite Ca0.61Nd0.26TiO3 (CNT) ceramic by doping with three different additives (Cr2O3, MnO2, and SnO2). 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 = Cr3+, Mn4+, Sn4+) for Ti4+ resulted in the oxygen octahedral distortion and changes of order degree of B-site, which was confirmed by Raman spectra. The er and τf values were concerned with the average ionicity of B–O bond fi(B-ave) and the linear expansion coefficient α, respectively. The X-ray photoelectron spectra indicated that three different additives could restrain the reduction of Ti4+, 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 % Cr2O3 ceramic compared with Q × f value of 11 207 GHz in pure CNT ceramic. |
| Databáze: | OpenAIRE |
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