. . . "where R is a template, a has a value great enough to constitute an effective concentration of R and is within the range of from greater than zero (0) to about 3; b has a value of from zero to 500; x, y, and z represent the mole fractions, respectively, of element M, aluminum, and phosphorus wherein x has a value equal to or greater than zero (0), and y and z each have a value" .