Field grading members, cables having field grading members, and methods of making field grading members

A method of making a field grading member, comprising:

• receiving a particulate filler, wherein the particular filler include a plurality of cores formed of zinc oxide doped with fluoride atoms;
• depositing an oxide mixed layer on each of the plurality of cores;
• depositing a conducting oxide layer on each of the oxide mixed layers of the cores;
• and
• distributing the cores that have the oxide mixed layer and the conductive oxide layers deposited on them within a polymeric matrix to form a field grading member;
• wherein the conductive oxide layer is deposited so that it provides an electrical percolation path through the polymeric matrix triggered by strength of an electric field extending through the field grading member.