NOVELTY - Thermoelectric material comprises a body centered cubic filled skutterudite (Q).    USE - (Q) is useful: in a thermoelectric device, which is thermoelectric power generator (all claimed); and as n-type and p-type semiconductors in thermoelectric applications including applications involving waste heat recovery from engines or industrial sources, solar thermal electrical power generation and solid state memory devices.    ADVANTAGE - (Q) provides thermoelectric device, which: provides a source of electrical power when subject to a temperature gradient across the first and second heat transfer plates; provides a solid state thermoelectric cooler or heater when a DC voltage is applied across the n-type and p-type thermoelectric semiconductors; and provides high thermoelectric performance at lower cost when compared with unfilled and rare earth filled skutterudites. (Q) utilizing nickel, which lowers the material costs of the filled skutterudite, because nickel is less expensive than cobalt and a semiconducting composition can be reached with less nickel than cobalt.    DETAILED DESCRIPTION - Thermoelectric material comprises a body centered cubic filled skutterudite (Q) of formula (AxFeyNizSb12) (I), (A1x1A2x2FeyNizSb12) (II) or (A1x1A2x2A3x3FeyNizSb12) (III).    A, A1, A2, A3 = alkaline earth element;    x = not more than 1;    sum of y and z = 4; and    sum of x1 and x2 (in (II)), sum of x1, x2 and x3 (in (III)) = not more than 1.    An INDEPENDENT CLAIM is also included for a thermoelectric device comprising first and second heat transfer plates, n-type (22) and p-type (24) thermoelectric semiconductors disposed between the first (26) and second (28) heat transfer plates, the n-type and p-type thermoelectric semiconductors being electrically connected in series and thermally connected in parallel, where at least one of the n-type and p-type thermoelectric semiconductors include (Q).    DESCRIPTION OF DRAWING(S) - The figure schematically depicts a thermoelectric power generator including an alkaline earth filled nickel skutterudite antimonide thermoelectric material.    Negative-type alkaline earth filled nickel skutterudite antimonide semiconductor (n-type semiconductor) (22)    Positive-type alkaline earth filled nickel skutterudite antimonide semiconductor (p-type semiconductor) (24)    First plate or substrate (26)    Heat source (27)    Second plate or substrate (28)