Low-emissivity glass including spacer layers compatible with heat treatment

A low emissivity panel comprising:

• a first reflective layer;
• a second reflective layer;
• a spacer layer disposed between the first reflective layer and the second reflective layer, wherein the spacer layer has a thickness of between about 20 nm and 90 nm and a substantially uniform composition throughout the thickness thereof, and wherein the spacer layer comprises a bi-metal oxide, the bi-metal oxide comprising tin and one of bismuth and niobium;
• and
• a barrier layer disposed between the first reflective layer and the spacer layer, wherein the barrier layer comprises one of a nickel chromium titanium aluminum alloy or a nickel chromium titanium aluminum oxide, wherein the one of the nickel chromium titanium aluminum alloy or the nickel chromium titanium aluminum oxide comprises between about 5% and about 10% by weight nickel, between about 25% and about 30% by weight chromium, between about 30% and about 35% by weight titanium, and between about 30% and about 35% by weight aluminum.