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PURPOSE : A pyrochlore crystal structured ceramic material and a manufacturing method thereof are provided to show low thermal conductivity of 1.3~1.6 W/mK while preventing a rapid decrease in thermal expansion coefficient within a temperature range of 200~400°C.CONSTITUTION : A pyrochlore crystal structured ceramic material has a pyrochlore crystal structure of A2B2O7 and a composition of LaaY2-aCe2O7(0© KIPO 2009