A ferroelectric ceramic glass and its manufacturing method, and, glass composition

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Disclosed is a ferroelectric glass ceramic material which has a low Curie temperature and can be fired together with a low-melting-point metal such as Ag or Cu at the same time. Specifically disclosed is a ferroelectric glass ceramic material obtained by firing a glass composition represented by x[(1 - y)BaTiO3·yLnAlO3]·uSiO2·vAl2O3 (wherein 0.35 = x = 0.75, 0 3 and a Curie temperature within a range of -100°C to 80°C.