초록

Negative thermal expansion materials, methods of preparation and uses therefor are disclosed. The materials are useful for negative thermal expansion substrates, such as those used for optical fiber gratings.

대표청구항 ▼

[ What is claimed is:] [1.] A ceramic body comprising A.sub.2 P.sub.2 WO.sub.12, and a crystalline or non-crystalline oxide phase, including a glassy phase, which contains a metal selected from the group consisting of alkaline earth metals, alkali metals, manganese, iron, cobalt, copper, zinc, alumi

[ What is claimed is:] [1.] A ceramic body comprising A.sub.2 P.sub.2 WO.sub.12, and a crystalline or non-crystalline oxide phase, including a glassy phase, which contains a metal selected from the group consisting of alkaline earth metals, alkali metals, manganese, iron, cobalt, copper, zinc, aluminum, gallium, and bismuth, wherein A is selected from the group consisting of Zr and Hf, wherein the A.sub.2 P.sub.2 WO.sub.12 is present in amount greater than about 95 weight percent and the body has a porosity less than about 5%.