| 501 / | HD | COMPOSITIONS: CERAMIC |
| 1 | DF | CERAMIC COMPOSITIONS {15} |
| 134 | DF | .~ Titanate, zirconate, stannate, niobate, or tantalate or oxide of titanium, zirconium, tin, niobium, or tantalum containing (e.g., dielectrics, etc.) {1} |
| 135 | DF | .~.~ Alkaline earth or magnesium containing {1} |
| 136 | DF | .~.~.~ Titanate containing {1} |
| 137 | | .~.~.~.~ Barium titanate {2} |
| 138 | DF | .~.~.~.~.~> And divalent metal oxide other than alkaline earth oxide or magnesium oxide |
| 139 | DF | .~.~.~.~.~> And trivalent metal oxide |