EMF STUDY ON THERMODYNAMIC INSTABILITY AND 1/8-ANOMALY OF (LA(1-X)M(X))(2)CUO4-DELTA (M=BA, SR AND CA) SOLID-SOLUTION

被引：10

作者：

IDEMOTO, Y

TOKUE, H

FUEKI, K

机构：

[1] Department of Industrial Chemistry, Faculty of Science and Technology, Science University of Tokyo, Noda-shi, Chiba, 278

来源：

PHYSICA C | 1995年 / 243卷 / 1-2期

关键词：

D O I：

10.1016/0921-4534(94)02448-0

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

The standard free energy, the standard enthalpy of formation, and the standard entropy, of a (La(1-x)M(x))(2)CuO4-delta (M = Ba, Sr and Ca) solid solution, were determined by the EMF (electromotive force) measurement using a solid state cell. The standard free energy change of solid solution formation from simple oxides was determined as a function of x. It was found that in the case of (La1-xBax)(2)CuO4-delta (LBCO) the solid solution is thermodynamically unstable in the compositional range 0.04<x<0.08 and the maximum instability energy is 3 kJ/mol. It was concluded that the thermodynamic instability results in the decreases in carrier concentration and T-c, and causes the so-called '1/8 anomaly'.

引用

页码：43 / 52

页数：10

共 15 条

[1] STRUCTURAL PHASE-TRANSFORMATIONS AND SUPERCONDUCTIVITY IN LA2-XBAXCUO4 [J].

AXE, JD ;

MOUDDEN, AH ;

HOHLWEIN, D ;

COX, DE ;

MOHANTY, KM ;

MOODENBAUGH, AR ;

XU, YW .

PHYSICAL REVIEW LETTERS, 1989, 62 (23) :2751-2754

[2]

CHANDRASEKHARAIAH MS, 1979, HIGH TEMP SCI, V11, P65

[3]

ELLIOTT JF, 1960, THERMODYNAMIC STEELM, V1, P190

[4]

FUEKI K, IN PRESS

[5]

HAA H, 1969, Z KRISTALLOGR, V129, P259

[6] DEFECT THERMODYNAMICS OF (LA1-XSRX)2CUO4-DELTA SUPERCONDUCTING OXIDE [J].

IDEMOTO, Y ;

FUEKI, K .

JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS, 1990, 29 (12) :2725-2728

[7] DETERMINATION OF THERMODYNAMIC DATA OF LN1.85CE0.15CUO4 AND LN2CUO4 (LN=ND, SM, EU) BY THE EMF METHOD [J].

IDEMOTO, Y ;

OYAGI, I ;

FUEKI, K .

PHYSICA C, 1992, 195 (3-4) :269-276

[8] THERMODYNAMIC STUDY ON THE Y-BA-CU-O SYSTEM BY THE EMF METHOD [J].

IDEMOTO, Y ;

OHYAGI, I ;

FUEKI, K .

PHYSICA C, 1992, 199 (1-2) :207-216

[9] THERMODYNAMIC STUDY ON (LA1-XSRX)2CUO4-DELTA BY THE EMF-MEASUREMENT [J].

IDEMOTO, Y ;

TOKUE, H ;

FUEKI, K .

DENKI KAGAKU, 1993, 61 (07) :753-755

[10] THERMODYNAMIC STABILITY OF (LA(1-X)M(X))(2)CUOY (M=BA, SR AND CA) SOLID-SOLUTION AND THE 1/8-ANOMALY [J].

IDEMOTO, Y ;

YASUDA, Y ;

FUEKI, K .

PHYSICA C, 1995, 243 (1-2) :35-42

← 1 2 →