Heat treatable coated article with anti-migration barrier between dielectric and solar control layer portion, and methods of making same

A heat treated coated article comprising:

• first and second dielectric layers each comprising silicon nitride supported by a substrate;
• a layer comprising at least first and second metal oxide portions located between the first and second dielectric layers, wherein the first and second metal oxide portions are separated from one another by a central layer portion that is less oxidized than either of the first and second metal oxide portions;
• and
• wherein the coated article has a ΔE* value no greater than 5.0 after heat treatment.

A heat treated coated article comprising:

• first and second dielectric layers supported by a substrate, each of said first and second dielectric layers comprising silicon nitride;
• a layer comprising at least first and second metal oxynitride portions located between the first and second dielectric layers, wherein the first and second metal oxynitride portions are separated from one another by a central layer portion that is less oxidized than either of the first and second metal oxynitride portions;
• and
• wherein the coated article has a ΔE* value no greater than 5.0 after heat treatment.

A heat treated coated article comprising:

• first and second dielectric layers each comprising silicon nitride;
• a layer structure supported by a substrate and located between the first and second dielectric layers, the layer structure being made using a single sputtering target so as to be oxidation graded to include first and second oxide portions which are each at least partially oxidized and which sandwich therebetween a central portion that is more metallic than the first and second oxide portions,
• wherein the first and second oxide portions are each from 50-100% oxidized and the central portion is from 0-10% oxidized;
• and
• wherein the coated article has a ΔE* value no greater than 5.0 after heat treatment.

A heat treated coated article comprising:

• first and second dielectric layers each comprising a nitride supported by a substrate;
• a layer structure provided between the first and second dielectric layers, the layer structure including first and second metal oxide inclusive layer portions and a metal layer portion located between the first and second metal oxide inclusive layer portions;
• wherein the metal oxide inclusive layer portions each comprise oxides of the same metal as in the metal layer portion;
• and
• wherein the coated article has a ΔE* value no greater than 5.0 after heat treatment.

A heat treated coated article comprising:

• first and second dielectric layers each comprising silicon nitride and being supported by a substrate;
• an oxidation graded layer located between the first and second dielectric layers, the oxidation graded layer having a top side and a bottom side;
• wherein the oxidation graded layer is oxidation graded to become gradually less oxidized from the bottom side of the layer to a central portion of the layer and then to become gradually more oxidized from the central portion of the layer to the top side of the layer;
• and
• wherein the coated article has a ΔE* value no greater than 5.0 after heat treatment.