Method for producing a capacitor element comprising a dielectric ceramic film, slip for producing a dielectric ceramic film, and capacitor element comprising a dielectric ceramic film

A method (1) for producing a capacitor element comprising a dielectric ceramic film (9), the method comprising:

• producing, in a slip production step (2), a slip from a ceramic powder and an organic medium,
• wherein the ceramic powder comprises
• oxides, including at least Bi2O3, TiO2, ZrO2, and Al2O3, or precursors thereof, and
• carbonates, including at least Na2CO3, BaCO3, and CaCO3, or precursors thereof,
• in a stoichiometric ratio in order to synthesize (1−x)[0.8 (0.94 Na0.5Bi0.5TiO3·0.06 BaTiO3)·0.2 CaZrO3]·x BiAlO3,
• where x=0.5, 1, 1.5, 2, 4 and 8 mol %;
• casting the slip as a film in a film-casting step (3);
• applying an electrode (10) to the cast film in an electrode-application step (4);
• and
• sintering the cast film provided with the electrode (10) in a sintering step (5) at an elevated temperature in order to remove organic material from a structure and to convert the cast film into the dielectric ceramic films (9),
• wherein the dielectric ceramic film (9) comprises at least (1−x)[0.8 (0.94 Na0.5Bi0.5TiO3·0.06 BaTiO3)·0.2 CaZrO3]·x BiAlO3, where x=0.5, 1, 1.5, 2, 4 and 8 mol %, and
• wherein the organic medium comprises
• at least one liquid solvent which contains at least 1-butanol,
• at least one plasticiser which contains acetyl tributyl citrate,
• at least one dispersing agent, and
• at least one binder.

A slip for producing a dielectric ceramic film (9), comprising:

• a ceramic powder;
• and
• an organic medium,
• wherein the ceramic powder comprises
• oxides, including at least Bi2O3, TiO2, ZrO2, and Al2O3, or precursors thereof, and carbonates, including at least Na2CO3, BaCO3, and CaCO3, or precursors thereof, and
• wherein the organic medium comprises
• at least one solvent which comprises at least 1-butanol,
• at least one plasticiser which comprises at least acetyl tributyl citrate,
• at least one dispersing agent, and
• at least one binder.