MOSSBAUER CHARACTERISTICS OF THE SR2COFEO6 PEROVSKITE OBTAINED BY ELECTROCHEMICAL OXIDATION

被引：34

作者：

BEZDICKA, P ^{[1
]}

FOURNES, L ^{[1
]}

WATTIAUX, A ^{[1
]}

GRENIER, JC ^{[1
]}

POUCHARD, M ^{[1
]}

机构：

[1] UNIV BORDEAUX 1,CNRS,CHIM SOLIDE LAB,351 COURS LIBERAT,F-33405 TALENCE,FRANCE

来源：

SOLID STATE COMMUNICATIONS | 1994年 / 91卷 / 07期

关键词：

D O I：

10.1016/0038-1098(94)90363-8

中图分类号：

O469 [凝聚态物理学];

学科分类号：

070205 ;

摘要：

The Sr2CoFeO6 cubic perovskite was prepared using electrochemical oxidation of the Sr2CoFeO5 brownmillerite - type compound. The starting material was prepared by quenching in liquid nitrogen from 1473 K. This preparation method produces stoichiometric Sr2CoFeO5 with random distribution of Fe and Co cations in both crystallographic sites. The starting material was characterized by powder X-ray diffraction and Fe-57 Mossbauer resonance spectroscopy. The electrochemical oxidation was carried out in the galvanostatic mode (I = 250 muA), at room temperature, using a three electrode system with a solution of 1M NaOH in equilibrium with air. The material obtained after this oxidation, Sr2CoFeO6, showed a cubic structure (a = 383.7 pm) and its Mossbauer resonance spectra revealed the presence of Fe(IV) only. The temperature dependence of the spectra between 293 and 341 K characterizes the coexistence of magnetically ordered and paramagnetic phases up to 325 K, which corroborates the ferromagnetic behaviour found at 325 K from magnetization measurements.

引用

页码：501 / 505

页数：5

共 15 条

[1] SUPERCONDUCTING BEHAVIOR OF THE T/O STRUCTURAL TYPE PHASE LA2-XNDXCUO4+DELTA (0 LESS-THAN X LESS-THAN 0.60) UNDER OXIDIZING CONDITIONS [J].

ARROUY, F ;

WATTIAUX, A ;

CROS, C ;

DEMAZEAU, G ;

GRENIER, JC ;

POUCHARD, M ;

ETOURNEAU, J .

PHYSICA C, 1991, 175 (3-4) :342-346

[2] THE CRYSTAL AND MAGNETIC-STRUCTURES OF SR2COFEO5 [J].

BATTLE, PD ;

GIBB, TC ;

LIGHTFOOT, P .

JOURNAL OF SOLID STATE CHEMISTRY, 1988, 76 (02) :334-339

[3] THE FORMATION OF NONEQUILIBRIUM MICRODOMAINS DURING THE OXIDIATION OF SR2COFEO5 [J].

BATTLE, PD ;

GIBB, TC ;

NIXON, S .

JOURNAL OF SOLID STATE CHEMISTRY, 1988, 73 (02) :330-337

[4]

Belov K. P., 1956, FIZ MET METALLOVED+, V2, P3

[5] PREPARATION AND CHARACTERIZATION OF FULLY STOICHIOMETRIC SRCOO3 BY ELECTROCHEMICAL OXIDATION [J].

BEZDICKA, P ;

WATTIAUX, A ;

GRENIER, JC ;

POUCHARD, M ;

HAGENMULLER, P .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1993, 619 (01) :7-12

[6]

BEZDICKA P, 1993, THESIS U BORDEAUX 1

[7] ELECTRON-MICROSCOPY STUDY OF ELECTROCHEMICALLY PREPARED LA2NIO4+DELTA(0.17-LESS-THAN-OR-EQUAL-TO-DELTA-LESS-THAN-OR-EQUAL-TO-0.26) [J].

DEMOURGUES, A ;

WEILL, F ;

GRENIER, JC ;

WATTIAUX, A ;

POUCHARD, M .

PHYSICA C, 1992, 192 (3-4) :425-434

[8] MOSSBAUER LATTICE-PARAMETERS OF MIXED TIN FLUORIDE ALPHA-SN2F6 [J].

FOURNES, L ;

LAGASSIE, P ;

POTIN, Y ;

GRANNEC, J ;

HAGENMULLER, P .

MATERIALS RESEARCH BULLETIN, 1986, 21 (08) :999-1009

[9] HIGH-TEMPERATURE MOSSBAUER RESONANCE, THERMAL EVOLUTION OF MOSSBAUER PARAMETERS OF SRFEO250 [J].

FOURNES, L ;

POTIN, Y ;

GRENIER, JC ;

HAGENMULLER, P .

REVUE DE PHYSIQUE APPLIQUEE, 1989, 24 (04) :463-468

[10] A NEW SUPERCONDUCTOR OBTAINED BY ELECTROCHEMICAL OXIDATION OF LA2CUO4 [J].

GRENIER, JC ;

WATTIAUX, A ;

LAGUEYTE, N ;

PARK, JC ;

MARQUESTAUT, E ;

ETOURNEAU, J ;

POUCHARD, M .

PHYSICA C, 1991, 173 (3-4) :139-144

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