Spectrophotometric Determination of the Average Valence of Bismuth in a High-Tc Superconductor with o-Tolidine.
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- WATANABE Kunihiro
- Faculty of Science and Technology, Science University of Tokyo
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- ISHIKAWA Makoto
- Faculty of Science and Technology, Science University of Tokyo
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- OOKUBO Shingo
- Faculty of Science and Technology, Science University of Tokyo
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- ITAGAKI Masayuki
- Faculty of Science and Technology, Science University of Tokyo
Bibliographic Information
- Other Title
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- Spectrophotometric Determination of the
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Abstract
A determination was made of the average valence of bismuth in the Bi-Sr-Ca-Cu-O superconductor using the o-tolidine spectrophotometric method to lessen the amount of sample required. The chlorine liberated by a reaction between Bi(V) and hydrochloric acid was stoichiometrically equivalent to Bi(V) in the sample. Bi(V) was determined over the range of 0.01-0.10mg based on the absorbance observed with the oxidant of o-tolidine. The total bismuth was determined by spectrophotometry after the extraction of Bi(III) with Zephiramine and iodide ions into chloroform. By a Bi(V) determination with o-tolidine, the amount of consumed sample could be decreased down 0.5mg. Although Cu(III) did not hinder the determination of Bi(V), Pb(IV) did. In the 2212 Bi-Sr-Ca-Cu-O sample having a high Tc of 90K, the average valences of bismuth was confirmed to be from 3.12 to 3.17.
Journal
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- Analytical Sciences
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Analytical Sciences 13 (2), 213-216, 1997
The Japan Society for Analytical Chemistry
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Details 詳細情報について
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- CRID
- 1390282679230388736
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- NII Article ID
- 130003528148
- 10002411053
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- NII Book ID
- AA10500785
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- COI
- 1:CAS:528:DyaK2sXis12nu70%3D
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- ISSN
- 13482246
- 09106340
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- NDL BIB ID
- 4196978
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- Text Lang
- en
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- Data Source
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- JaLC
- NDL
- Crossref
- CiNii Articles
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- Abstract License Flag
- Disallowed