Method for preparing Gd and Co codoped high-remanent-polarization BiFeO3 thin film by sol-gel method
A sol-gel method, a technology of polarization strength, applied in chemical instruments and methods, inorganic chemistry, iron compounds, etc., can solve the problems of small coercive field, iron valence fluctuation, low resistivity, etc. Good performance, uniformity, and the effect of improving ferroelectric properties
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[0019] Example 1:
[0020] 1) Put Bi(NO 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O, Gd (NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·9H 2 O was dissolved in ethylene glycol methyl ether in a molar ratio of 1:0.97:0.05:0.03, then heated and stirred in a water bath at 80 °C for 1 h, and then added with acetic anhydride and stirred for 1 h to obtain stable BiFeO 3 Precursor; among them, BiFeO3 The total metal ion concentration in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;
[0021] 2) The precursor solution was left standing for 24 hours, and BiFeO was spin-coated on the FTO / glass substrate by spin coating. 3 A thin film was prepared from the precursor solution, and then the thin film was rapidly annealed at 550 °C for 8 min, then lowered to room temperature, and the spin coating-rapid process in step 2) was repeated until the desired thickness of crystalline BiFeO was prepared. 3 thin film, the BiFeO 3 The co...
Example Embodiment
[0022] Example 2:
[0023] 1) Put Bi(NO 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O, Gd (NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·9H 2 O was dissolved in ethylene glycol methyl ether in a molar ratio of 0.98:0.97:0.07:0.03, then heated and stirred in a water bath at 80 °C for 1 h, and then acetic anhydride was added and stirred for 1 h to obtain stable BiFeO 3 Precursor; among them, BiFeO 3 The total metal ion concentration in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;
[0024] 2) The precursor solution was left standing for 24 hours, and BiFeO was spin-coated on the FTO / glass substrate by spin coating. 3 A thin film was prepared from the precursor solution, and then the thin film was rapidly annealed at 550 °C for 8 min, then lowered to room temperature, and the spin coating-rapid process in step 2) was repeated until the desired thickness of crystalline BiFeO was prepared. 3 thin film, the BiFeO 3 Th...
Example Embodiment
[0025] Example 3:
[0026] 1) Put Bi(NO 3 ) 3 ·5H 2 O, Fe (NO 3 ) 3 ·9H 2 O, Gd (NO 3 ) 3 ·6H 2 O and Co(NO 3 ) 2 ·9H 2 O was dissolved in ethylene glycol methyl ether at a molar ratio of 0.95:0.97:0.10:0.03, then heated and stirred in a water bath at 80 °C for 1 h, and then acetic anhydride was added and stirred for 1 h to obtain stable BiFeO 3 Precursor; among them, BiFeO 3 The total metal ion concentration in the precursor solution is 0.3 mol / L, and the volume ratio of ethylene glycol methyl ether and acetic anhydride is 3:1;
[0027] 2) The precursor solution was left standing for 24 hours, and BiFeO was spin-coated on the FTO / glass substrate by spin coating. 3 A thin film was prepared from the precursor solution, and then the thin film was rapidly annealed at 550 °C for 8 min, then lowered to room temperature, and the spin coating-rapid process in step 2) was repeated until the desired thickness of crystalline BiFeO was prepared. 3 thin film, the BiFeO 3 Th...
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