NOVELTY - A thermoelectric composition comprises a material consisting of silver, sodium and/or potassium, tin, lead, trivalent element, and chalcogenide element.    USE - The composition, e.g. Ag0.9Pb9Sn9Sb0.6Te20 or Ag0.9Pb10Sn8Sb0.8Te20, is useful as p-type semiconductors in thermoelectric element for thermoelectric generator. This thermoelectric generator is used for generating electrical energy from heat energy (all claimed).    ADVANTAGE - The composition exhibits a figure of merit ZT of up to greater than or equal to 1.4 at 800degreesK. It produces thermoelectric devices with high efficiencies.    DETAILED DESCRIPTION - A thermoelectric composition comprises a material of formula:    (AgaX1-a)1plus minusx(SnbPb1-b)mM'1-yQ2+m.    X = Na and/or K;    M' = trivalent element selected from Sb, Bi, and/or lanthanide elements;    Q = chalcogenide element selected from S, Te, and/or Se;    a, b = greater than 0 and less than or equal to 1;    x, y = greater than 0 and less than 1; and    m = 2-30.    INDEPENDENT CLAIMS are also included for:    (1) a method of making conductive material of formula, (AgaX1-a)1plus minusx(SnbPb1-b)mM'1-yQ2+m, comprising adding stoichiometric amounts of starting materials comprising silver, sodium and/or potassium, Sn, Pb, M' and Q to a reaction vessel; heating the starting materials to melt the starting materials; and cooling the reaction mixture;    (2) a thermoelectric element comprising n-type semiconductor (10) and p-type semiconductor (11) joined electrically to form a couple, where the p-type semiconductor comprises a material of formula (AgaX1-a)1plus minusx(SnbPb1-b)mM'1-yQ2+m;    (3) thermoelectric generator comprising the above thermoelectric element; and    (4) a method for generating electrical energy from heat energy, comprising applying heat energy to thermoelectric module operating according to the Seebeck effect, where the thermoelectric module comprises a p-type semiconductor composition as above.    DESCRIPTION OF DRAWING(S) - The figure is schematic diagram of a thermoelectric couple.    N-type semiconductor (10)    P-type semiconductor (11)    Conductors (12, 15)    External circuit (14)