Glasses Technology

What is claimed is:

1. A semiconducting glass composition consisting essentially of as given in weight percent:

with V.sub.2 O.sub.5 + MoO.sub.3 + P.sub.2 O.sub.5 being in the range of 70 to 90 weight percent, the glass being chemically stable and having a resistivity within the range of from about 2 .times. 10.sup.7 to about 6 .times. 10.sup.8 ohm.sup.. cm.

2. A semiconducting glass composition according to claim 1 wherein the ingredients are present in the following weight percentages:

3. A semiconducting glass composition according to claim 1 wherein the ingredients are present in the following weight percentages:

4. A semiconducting glass composition according to claim 1 wherein the ingredients are present in the following weight percentages:

5. A semiconducting glass composition according to claim 1 wherein the ingredients are present in the following weight percentages:

6. A semiconducting glass composition according to claim 1 wherein the ingredients are present in the following weight percentages:

7. A semiconducting glass composition according to claim 1 wherein the V.sub.2 O.sub.5 + MoO.sub.3 + P.sub.2 O.sub.5 is about 79-89%.

8. A method of manufacturing a semiconducting glass composition comprising:

thoroughly mixing the following ingredients where the ingredients are present in the following ranges as given in weight percent:

where the V.sub.2 O.sub.5 + MoO.sub.3 + P.sub.2 O.sub.5 is in the range of 70 to 90 weight percent;

gradually filling the thoroughly mixed ingredients into a crucible preheated to at least 2000.degree.F;

heating the filled crucible to above the melting temperature of the ingredients;

maintaining the temperature until all of the ingredients are melted;

stirring the resulting melt to assure homogeniety;

casting the melt in a mold preheated to a temperature above the strain point of the glass; and

annealing the case glass.

9. A glass composition consisting essentially of:

about 70 to 90 weight percent of the essential ingredients V.sub.2 O.sub.5, MoO.sub.3, and P.sub.2 O.sub.5 ;

the V.sub.2 O.sub.5 being present in an amount ranging from 27.8 to 50 weight percent of the essential ingredients;

the MoO.sub.3 being present in an amount ranging from 38.9 to 64.3 weight percent of the essential ingredients; and

the P.sub.2 O.sub.5 being present in an amount ranging from 11.3 to 28.6 weight percent of the essential ingredients;

about 2 to 10 weight percent of at least one modifying oxide selected from the group consisting of Fe.sub.3 O.sub.4 and Co.sub.3 O.sub.4 ; and

about 3 to 20 weight percent of at least one modifying oxide selected from the group consisting of BaO, Al.sub.2 O.sub.3, and CaO.

10. The invention of claim 9 wherein said modifying oxides are BaO, Al.sub.2 O.sub.3 and Fe.sub.3 O.sub.4.

11. The invention of claim 9 wherein said modifying oxides are BaO, Fe.sub.3 O.sub.4, CaO and Co.sub.3 O.sub.4.

12. The invention of claim 9 wherein said modifying oxides are Al.sub.2 O.sub.3, and Fe.sub.3 O.sub.4.

13. The invention of claim 9 wherein said modifying oxides are BaO, Fe.sub.3 O.sub.4, and CaO.

14. The invention of claim 9 wherein said modifying oxides are BaO, CaO, and Co.sub.3 O.sub.4.