Abstract
It is known that Cu valence of cuprate superconductors govern transition temperature (Tc). For La2-xSrxCuOy, when x = 0.15, that is, Cu valence is 2.15, the highest Tc around 40K is achieved. The Cu valence is determined both by strontium and oxygen content. So far, coulometry and iodometry have been used for determining oxygen content. However, these chemical analyses usually require experience. The purpose of this research is to develop a novel measuring method of oxygen content in cuprate superconductors with a developed dissolved oxygen sensor. Signal received from the sensor is sent to PC automatically without any external power supply. Oxygen content obtained with the sensor was newly compared with iodometry. It was found that this method is reliable enough to determine oxygen content in La2-xSrxCuOy, and is called dissolved oxygen method.
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