Method for preparing room-temperature multiferroic BiFeO3-SrTiO3 sosoloid ceramics
A room temperature multiferroic, solid solution technology, applied in the field of information functional materials, can solve problems such as no records, and achieve the effects of lowering phase formation temperature, no need for reducing atmosphere, and short cycle time
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Embodiment 1
[0026] Preparation of pure BiFeO by sol-gel method using citric acid as complexing agent 3 Ceramics, the first step, weigh 0.04mol citric acid and put it into a 100mL beaker, add 20mL of deionized water, dissolve it under ultrasonic dispersion, and form a transparent solution; weigh 0.02mol bismuth nitrate and add it to the above solution to dissolve under constant stirring , after being dissolved, weigh 0.02mol ferric nitrate and add to the above solution and dissolve. Under the condition of constant stirring, the pH value was adjusted to 7 with ammonia water, and the mixed solution was aged for 5 hours. In the second step, the solution was evaporated to dryness in a water bath at 90° C. to remove moisture, and dried in an oven at 140° C. until a black xerogel was formed. The third step is to grind the dry gel and heat-treat it in the air at 550°C for 5 hours to remove the organic matter to obtain the precursor powder, then grind the precursor powder, press it, and sinter at...
Embodiment 2
[0029] Preparation of 0.9BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.1SrTiO 3Ceramics, in the first step, weigh 0.04mol of citric acid into a 100mL beaker, add 20mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of analytically pure butyl titanate with a graduated straw, Add it to the above citric acid solution under constant stirring, add it to the above citric acid solution in turn, and disperse it ultrasonically for 30 minutes to form a transparent solution; then, weigh 0.02 mol of strontium nitrate, add it to the above solution to dissolve, add deionized water to obtain 40ml solution to become A solution. In the second step, weigh 0.04mol of citric acid and put it into a 100mL beaker, add 20mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of bismuth nitrate and add it to the above solution to dissolve under constant stirring, a...
Embodiment 3
[0032] Preparation of 0.8BiFeO by Sol-Gel Method Using Citric Acid as Complexing Agent 3 -0.2SrTiO 3 Ceramics, in the first step, weigh 0.04mol of citric acid into a 100mL beaker, add 20mL of deionized water, and dissolve under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of analytically pure butyl titanate with a graduated straw, Add it to the above citric acid solution under constant stirring, add it to the above citric acid solution in turn, and disperse it ultrasonically for 30 minutes to form a transparent solution; then, weigh 0.02 mol of strontium nitrate, add it to the above solution to dissolve, add deionized water to obtain 40ml solution to become A solution. In the second step, weigh 0.04mol of citric acid and put it into a 100mL beaker, add 20mL of deionized water, and dissolve it under ultrasonic dispersion to form a transparent solution; weigh 0.02mol of bismuth nitrate and add it to the above solution to dissolve under constant stirring, ...
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