RUTHENIUM OXIDE AND METHOD FOR PRODUCING RUTHENIUM OXIDE

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[Problem] To provide a ruthenium compound which shows large negative thermal expansion. [Solution] A ruthenium oxide of the present disclosure is represented by general formula (1) Ca2-xRxRu1-yMyO4+z (in formula (1), R represents at least one element selected from among alkaline earth metals and rare earth elements; M represents at least one element selected from among Sc, Ti, V, Cr, Mn, Fe, Co, Ni, Cu, Zn and Ga; 0 ≤ x < 0.2; 0 ≤ y < 0.3; and -1 < z < -0.02).