Phase separation driven by mobile cations in (Na1-xKx)0.35Co[Fe(CN)6]0.74•zH2O

被引：3

作者：

Abe, Y. ^{[1
]}

Kim, J. E. ^{[2
]}

Matsuda, T. ^{[1
]}

Shibata, T. ^{[1
]}

Tanida, H. ^{[2
]}

Uruga, T. ^{[2
]}

Moritomo, Y. ^{[1
]}

机构：

[1] Univ Tsukuba, Grad Sch Pure & Appl Sci, Tsukuba, Ibaraki 3058571, Japan

[2] JASRI SPring 8, Sayo, Hyogo 6795198, Japan

来源：

PHYSICAL REVIEW B | 2009年 / 80卷 / 13期

关键词：

TRANSITION; MAGNETORESISTANCE; LA1-XCAXMNO3; TEMPERATURE; CYANIDES;

D O I：

10.1103/PhysRevB.80.134101

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Cation substitution effects on structural and optical properties are investigated for films of Prussian-blue-type cyanides, (Na1-xKx)(0.35)Co[Fe(CN)(6)](0.74)zH(2)O(0.07 <= x <= 0.85). Substitution of K+ for Na+ induces a phase transition from high-spin (HS) phase with the electronic configuration of Co2+(t(2g)(5)e(g)(2))-Fe3+(t(2g)(5)) to low-spin (LS) phase with the electronic configuration of Co3+(t(2g)(6))-Fe2+(t(2g)(6)). At around room temperature, the HS phase (LS phase) is observed in the region of x <= 0.2(x >= 0.8) while two phases coexist in the intermediate-x region (0.2 <= x <= 0.8). We interpreted the two-phase region in terms of intrinsic phase separation into small-x (Na+-rich) and large-x (K+-rich) regions because the cations can migrate within the crystal to minimize the total free energy. We further confirmed that absorption spectra in the infrared, visible and Co/Fe K edge regions are quantitatively reproduced by the phase-separation model.

引用

页数：6

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