Abstract
A hot spot, which is a local area glowing orange, appears in a LnBa2Cu3O7−δ (Ln: rare earth element) ceramic rod when a voltage exceeding a certain value is applied to the rod at room temperature. After the appearance of the hot spot, the current changes according to the oxygen partial pressure in ambient atmosphere, which acts as an oxygen sensor without the need for any heating system. The GdBa2Cu3O7−δ rod tended to be melted and broken by a sustained presence of the hot spot in a high oxygen partial pressure Po2 (∼100 kPa). The composite rod containing high melting point materials, such as BaAl2O4, BaZrO3 and Gd2BaCuO5, showed a remarkable high durability in O2 atmosphere. In a low Po2 (< 0.02 kPa), the current through the GdBa2Cu3O7−δ rod decreases to almost zero and the hot spot disappeared, resulting in an insensitive rod to oxygen. The composite rod containing CuO detected oxygen even in Po2 < 0.002 kPa.
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