Method for doping manganese,tungsten and molybdenic dielectric ceramics powder ,and capacitor therefor
A technology of dielectric ceramics and powders, applied in the field of multilayer capacitors, which can solve the problems of low diffusion rate, incorporation and uneven distribution
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example 1
[0034] In order to prepare a Mn 2 MoWO 8 The composition of the colloidal phase, first by adding 6.004g (NH 4 ) 10 W 12 o 41 *5·H 2O (ammonium paratungstate, available from Merck, Darmstadt) with 4.061 g (NH 4 ) 6 Mo 7 o 24 *4·H 2 O (ammonium molybdate, available from Merck, Darmstadt) was dissolved in 400 ml H 2 O to prepare solution A. By adding NH 3 solution, adjust the pH to 7. Then, by adding 11.267g Mn(Ac) 2 *4·H 2 O (manganese acetate, available from Merck, Darmstadt) was dissolved in 100 ml H 2 O to prepare solution B. Subsequently, solution B was added to solution A with stirring, maintaining the temperature at about 50°C. By adding NH 3 solution to adjust the pH of the mixture to 7. A precipitate was obtained, which was stirred in the resulting aqueous suspension at 50° C. for 15 minutes. Subsequently, the resulting precipitate was centrifuged, washed with water and centrifuged again. The resulting precipitate was then suspended in 125 ml of etha...
example 2
[0036] Use the colloidal wolframite phase Mn that obtains in the example 1 2 MoWO 8 A dielectric ceramic powder doped with manganese, molybdenum and tungsten is prepared. provided doped with Y 2 o 3 , SiO 2 , MgO in the form of the composition disclosed in U.S. Patent No. 5,790,367 (d 50 ~0.5 μm, available from Ferro, Uden NL). A multilayer capacitor (MLCC) with 50 layers (3 μm thick each) was sintered from this powder using techniques known in the art. The sintering temperature is 1250°C, and the sintering atmosphere contains 99% N 2 and 1% H 2 , and saturated with water at 20 °C. After sintering, the N 2 and 500ppm O 2 The resulting capacitor was annealed for 1 hour in an atmosphere of the composition and at a temperature of about 1000°C.
example 3
[0042] 100g BaTiO 3 (d50 ~ 0.5μm, available from Ferro, Uden, NL) suspended in 350ml H 2 O middle.
[0043] The resulting suspension was adjusted to have a pH of 5.5 by adding 17 g of urea. Subsequently, a solution of 112 mg of ammonium paratungstate and 76 mg of ammonium molybdate dissolved in 100 ml of water and a solution of 210 mg of manganese acetate dissolved in 50 ml of water were added to the above BaTiO 3 in suspension. The suspension was heated to 95° C. within 30 minutes with stirring. The powder was filtered, washed with water and isopropanol and dried at about 110°C. The resulting powder was then calcined in air at about 650°C for 1 hour. The amount of dopant is 0.02 mole Mn / mole BaTiO 3 , 0.001 mol W / mol BaTiO 3 , 0.001 mole Mo / mole BaTiO 3 ; Equivalent to 0.001 mole Mn 2 MoWO 8 / mol BaTiO 3 .
[0044] It can be seen from electron micrographs that in BaTiO 3 A Mn-containing 2 MoWO 8 Firmly adhered layer of fine particles and layers.
[0045] Multi...
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