NO Intercalation Properties of Double-Layered Cuprate, La2-xBaxSrCu2O6. Effect of Treatment with Water Vapor
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- 作者：Masato Machida ; Hirotaka Murakami ; Takeshi Kitsubayashi ; and Tsuyoshi Kijima
- 刊名：Chemistry of Materials
- 出版年：1996
- 出版时间：January 1996
- 年：1996
- 卷：8
- 期：1
- 页码：197 - 203
- 全文大小：484K
- 年卷期：v.8,no.1(January 1996)
- ISSN：1520-5002
文摘
The NO intercalation properties of substituted double-layeredcuprates,La2-xBaxSrCu2O6,have been studied by means of XRD, ED, HREM, and FT-IR. The NOabsorbability wasstrongly influenced not only by the amount of Ba substitution but alsoby the pretreatmentwith saturated water vapor at 60 
C. The Ba substitution leadsto 
2a × 2a and 3a ×3asuperstructures, which are associated with the ordering of Ba andoxygen vacancies,respectively. The sample with the superstructure showed rapid NOuptake at 250 C onlyafter water vapor treatment. The XRD measurement demonstrates atwo-stage latticeexpansion along the c axis after reactions with water vaporand subsequently with NO.The parallel HREM study suggests that the expanded structure isdue to the insertion ofH2O and NO species into interlayers between bottom planesof CuO5 pyramids. Aging thesample in water vapor leads to the formation of interlayer hydroxylgroups, which areeffective in promoting NO intercalation by expanding the interlayerspacing between theCuO5 sheets.
C. The Ba substitution leadsto 2a × 2a and 3a ×3asuperstructures, which are associated with the ordering of Ba andoxygen vacancies,respectively. The sample with the superstructure showed rapid NOuptake at 250 C onlyafter water vapor treatment. The XRD measurement demonstrates atwo-stage latticeexpansion along the c axis after reactions with water vaporand subsequently with NO.The parallel HREM study suggests that the expanded structure isdue to the insertion ofH2O and NO species into interlayers between bottom planesof CuO5 pyramids. Aging thesample in water vapor leads to the formation of interlayer hydroxylgroups, which areeffective in promoting NO intercalation by expanding the interlayerspacing between theCuO5 sheets.