From T to T′-La2CuO4 via Oxygen Vacancy Ordered La2CuO3.5

被引：23

作者：

Houchati, Mohamed Ikbel ^{[1
,2
,3
,4
]}

Ceretti, Monica ^{[1
]}

Ritter, Clemens ^{[5
]}

Paulus, Werner ^{[1
]}

机构：

[1] Univ Montpellier 2, Inst Chim Mol & Mat, UMR Chim & Crystallochim Mat C2M 5253, F-34095 Montpellier, France

[2] Ctr Natl Rech & Sci Mat, Lab Valorisat Mat Utiles, Soliman 8027, Tunisia

[3] Univ Sfax, Fac Sci, Chim Inorgan Lab, Sfax 3000, Tunisia

[4] Univ Rennes 1, UMR Sci Chim Rennes 6226, F-35042 Rennes, France

[5] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

来源：

CHEMISTRY OF MATERIALS | 2012年 / 24卷 / 19期

关键词：

lanthanum copper oxide; calcium hydride reduction; nonstoichiometric oxides; topotactic reaction mechanism; neutron diffraction; LOW-TEMPERATURE SYNTHESIS; IN-SITU; ELECTROCHEMICAL OXIDATION; NEUTRON-DIFFRACTION; IRON-OXIDE; X-RAY; HYDROGEN; SUPERCONDUCTIVITY;

D O I：

10.1021/cm302485q

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

T-La2CuO4 can be transformed into T'-La2CuO4 via a two-step topotactic reaction mechanism. First T-La2CuO4 is reduced by CaH2 at 200 degrees C to La2CuO3.5 which can be subsequently reoxidized to T'-La2CuO4 at 300 degrees C in air. La2CuO3.5 does not adopt the Sr2CuO3 type "S-phase" structure, as taken for granted for almost 20 years, but constitutes an oxygen deficient T'-framework, with copper in 4-fold planar and 2-fold linear dumbbell coordination. Upon heating the T-La2CuO4 phase is reobtained from T'-La2CuO4 above 650 degrees C, confirming the "T-phase" to be the thermodynamically stable modification at least at higher temperature.

引用

页码：3811 / 3815

页数：5

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