研究目的
Investigation of the ternary system Bi2O3–TiO2–MgO, synthesis of materials in the Ti4++Bi3+ ratio to establish structural of a sillenite type using XRD and to investigate the effect MgO addition on the electrical conductivity.
研究成果
The sillenite phase has been successfully synthesized inside the ternary system Bi2O3–TiO2–MgO. The electrical properties of the synthesized compositions can be described with an impedance model including constant phase element and Warburg impedances. The highest conductivity is observed for Bi0.9Ti0.1O1.55 (σ = 1.39E?07 at 600?°C). The results obtained for electrical measurements show that these materials are good insulators and can be used for industrial applications.
研究不足
The low conductivity of the compositions is due to the decrease of the number of defects of oxygen and the presence probably single phases of Ti4+ and Mg2+ stop the circulation of the phases of oxygen.
1：Experimental Design and Method Selection:
Solid state reaction was used for synthesis. The structural refinements were undertaken from the powder data using the Rietveld method by means of FullProf program.
2：Sample Selection and Data Sources:
Powder crystalline samples were prepared from mixtures of Bi2O3, TiO2 and MgO in stoichiometric proportion.
3：List of Experimental Equipment and Materials:
Philips X’Pert PRO diffractometer, Zeiss Gemini supra 40 VP SEM, SOLARTRON SI 1260 electrical impedance spectrometer.
4：Experimental Procedures and Operational Workflow:
The raw materials were grounded in an agate mortar and then took at temperatures 700, 750 and 800?°C for 24?h for each thermal treatment with several intermediate grindings and followed by quenching.
5：Data Analysis Methods:
The study of the structure is conducted by analyzing the profile of X-ray diffraction diagrams of powder with the program FullProf using the pseudo-Voight function.
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