Pyrochlore thin films and process for making

An article comprising:

• (1) a substrate;
• and
• (2) a thin film comprising a pyrochlore coated on said substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73, wherein said thin film is tunable.

An article comprising:

• (1) a platinum coated substrate;
• and
• (2) a thin film comprising a pyrochlore coated on said substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73, wherein said thin film is tunable.

An article comprising:

• (1) a platinum coated silicon wafer substrate;
• and
• (2) a thin film comprising a pyrochlore coated on said substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73, wherein said thin film is tunable.

An article comprising:

• (1) a platinum coated silicon wafer substrate which is Pt/Ti/SiO2/Si;
• and
• (2) a thin film comprising a pyrochlore coated on said substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73, wherein said thin film is tunable.

A thin film comprising a pyrochlore having an electric field tunable dielectric constant, said pyrochlore being represented by the formula:

• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73;
• and wherein said pyrochlore is prepared by a process comprising the steps of:
• (a) coating a substrate with a precursor composition comprising a bismuth containing metal organic compound, a zinc containing metal organic compound and a niobium containing metal organic compound, an organic solvent, an organic acid and an organic base;
• (b) heating to remove organic components;
• and
• (c) annealing at a temperature and for a length of time sufficient to produce said pyrochlore thin film.

An article comprising:

• (1) a substrate selected from the group consisting of:
• alumina, indium-tin oxide, low temperature low-fire ceramic, strontium titanate and lanthanum nickelate;
• and
• (2) a thin film comprising a pyrochlore coated on said substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73.

An article comprising:

• (1) a metal coated substrate;
• and
• (2) a thin film comprising a pyrochlore coated on said metal coated substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73.

An article comprising:

• (1) a platinum coated substrate;
• and
• (2) a thin film comprising a pyrochlore coated on said platinum coated substrate, wherein said pyrochlore is represented by the formula:
• (Bi3xZn2−3x)(ZnxNb2−x)O7
• wherein x is from about 0.45 to about 0.73.