. . " equal to 0; (c) b, c, d, l, m and s each being equal to 0, a being about 1 to 3, i being from 0.1 to 3, j being from 0.1 to 3, and J being one or more of La and Ce; (cc) same as (c) above except h being equal to 0; (d) a, b, c, j and s each being equal to 0, d being from 1 to 3, i being from 0.1 to 3, m being from 1 to 2, and I being one or more of Na, K, Rb, and Cs; (dd) same as (d) above except" . .