Development of microcoulometry for measuring oxygen content in copper oxides

摘要

A microcoulometry system was developed and employed for measuring the oxygen content in copper oxides using a reduced amount of material. To achieve this reduction in sample size, Ar flow rate, and coulometric current were optimized. When using 5.0 mg of YBa_2Cu_3O_(6.71), which is about one-tenth of the amount used in conventional coulometry, the oxygen content was determined to be 6.68 ± 0.03 in the optimized conditions that Ar flow rate, and coulometric current were 0.11/min and 1.0 mA, respectively. This method will be useful for measuring the oxygen content of oxide samples smaller than 10 mg, i.e., oxide materials produced in small quantities for electronic applications.