| 摘要 |
The composition of the parent Specification which consists of Sb2O4 in combination or admixture with SnO2 is modified in that the atomic ratio of tin to antimony lies between 2-1 and 16-1 and additionally the composition contains 5-50% Sb2O3, the mixture having been heated to 550-1100 DEG C. Examples are given. |
