Softening method for producing ferroelectric and ferromagnetic composite material powder by home position
An in-situ preparation and composite material technology, which is applied in the field of ferrite/ferroelectric composite materials with magnetoelectric effect prepared by soft chemical method, achieves the effect of simple process, high purity and good chemical uniformity
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Embodiment 1
[0016] Example 1: 0.5Ni 0.5 co 0.028 Zn 0.472 Fe 2 o 4 -0.5Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation
[0017] Add 0.0125mol of nickel nitrate, 0.0007mol of cobalt nitrate, 0.0118mol of zinc nitrate, 0.05mol of iron nitrate, 0.025mol of barium nitrate, and 0.00125mol of zirconium nitrate into 150g of deionized water, then add 0.255mol of citric acid, and heat and stir in a water bath at 70°C After 2 hours, slowly add 0.02375 mol of tetrabutyl orthotitanate. After stirring to form a uniform solution, add ammonia water to adjust the pH to 6.5, and continue stirring for 8 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 150°C, and bake it in a drying oven at 250°C after the water is completely volatilized until it burns. After the burning, the powder is sintered in a muffle furnace at 900°C for 1.5 hours to obtain the required Powder.
[0018] Because the sum of the molar amounts of nitrates is greater than 5 times that of the metal alkoxi...
Embodiment 2
[0019] Example 2: 0.2Ni 0.5 co 0.028 Zn 0.472 Fe 2 o 4 -0.8Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation
[0020] Add 0.19mol citric acid to 150g deionized water, then add 0.005mol nickel nitrate, 0.00028mol cobalt nitrate, 0.00472mol zinc nitrate, 0.02mol iron nitrate, 0.04mol barium nitrate, 0.002mol zirconium nitrate, heat and stir in a water bath at 75°C After 2 hours, slowly add 0.038 mol of tetrabutyl orthotitanate. After stirring to form a uniform solution, add ammonia water to adjust the pH to 7, and continue stirring for 7 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 140°C, and bake it in a drying oven at 260°C after the water is completely volatilized until it burns. After burning, the powder is sintered in a muffle furnace at 850°C for 2 hours to obtain the required Powder.
[0021] Because the total molar weight of nitrate is less than 5 times of the molar weight of metal alkoxide, the molar weight of citric acid is 5 times...
Embodiment 3
[0022] Example 3: 0.5Ni 0.2 Cu 0.2 Zn 0.6 Fe 2 o 4 -0.5Ba(Zr 0.05 Ti 0.95 )O 3 Powder preparation
[0023] Add 0.005mol nickel nitrate, 0.005mol copper nitrate, 0.015mol zinc nitrate, 0.05mol iron nitrate, 0.025mol barium nitrate, 0.00125mol zirconium nitrate into 150g deionized water, then add 0.255mol citric acid, heat and stir in a water bath at 80°C After 2 hours, slowly add 0.02375 mol of tetrabutyl orthotitanate. After stirring to form a uniform solution, add ammonia water to adjust the pH to 6.5, and continue stirring for 8 hours to form a stable and uniform sol. Dry the prepared sol in a drying oven at 130°C, and bake it in a drying oven at 250°C after the water is completely volatilized until it burns. After burning, the powder is sintered in a muffle furnace at 900°C for 2 hours to obtain the required Powder.
[0024] Because the sum of the molar amounts of nitrates is greater than 5 times that of the metal alkoxides, the molar amount of citric acid is the s...
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