Transitions Between Lanthanum Cuprates: Crystal Structures of T′, Orthorhombic, and K2NiF4-type La2CuO4

被引：16

作者：

Hord, Roland ^{[2
]}

Cordier, Gerhard ^{[2
]}

Hofmann, Kathrin ^{[2
]}

Buckow, Alexander ^{[1
]}

Pascua, Gwendolyne ^{[3
]}

Luetkens, Hubertus ^{[3
]}

Alff, Lambert ^{[1
]}

Albert, Barbara ^{[2
]}

机构：

[1] Tech Univ Darmstadt, Inst Mat Wissensch, D-64287 Darmstadt, Germany

[2] Tech Univ Darmstadt, Eduard Zintl Inst Anorgan & Phys Chem, D-64287 Darmstadt, Germany

[3] Paul Scherrer Inst, Lab Muon Spin Spect, CH-5232 Villigen, Switzerland

来源：

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE | 2011年 / 637卷 / 09期

关键词：

Cuprates; Phase transitions; Crystal structure; T ' phases; K2NiF4-type; LOW-TEMPERATURE SYNTHESIS; OXIDE SUPERCONDUCTORS; NEUTRON-DIFFRACTION; MOLTEN HYDROXIDES; PHASE-SEPARATION; CHEMISTRY; SYSTEM;

D O I：

10.1002/zaac.201100176

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

Through low-temperature synthesis in CsOH flux, lanthanum cuprate La2CuO4 can be obtained in a metastable form, the so-called T' modification (tetragonal, I4/mmm, no. 139, a = 400.95(2) pm, c = 1254.08(7) pm). When heated, this T' phase transforms into a K2NiF4-type modification, whose crystal structure was now refined from X-ray powder data (tetragonal, I4/mmm, no. 139, a = 383.29(3) pm, c = 1331.3(2) pm at T = 1073 K). The well-known orthorhombic phase (s.g. Cmce, no. 64, a = 536.14(3) pm, b = 1315.53(8) pm, c = 540.20(3) pm) - usually obtained via conventional solid state synthesis - was observed to form upon cooling from the K2NiF4-type modification. High-temperature powder diffractometry allowed crystal structure refinements for all of the three phases.

引用

页码：1114 / 1117

页数：4

共 28 条

[1] Evaluation of the La2Ni1-xCUxO4+δ system as SOFC cathode material with 8YSZ and LSGM as electrolytes [J].

Aguadero, A. ;

Alonso, J. A. ;

Escudero, M. J. ;

Daza, L. .

SOLID STATE IONICS, 2008, 179 (11-12) :393-400

[2]

[Anonymous], 1989, ANGEW CHEM, V101, P1503

[3]

[Anonymous], 2009, PROGR TOPAS 4 2

[4] POSSIBLE HIGH-TC SUPERCONDUCTIVITY IN THE BA-LA-CU-O SYSTEM [J].

BEDNORZ, JG ;

MULLER, KA .

ZEITSCHRIFT FUR PHYSIK B-CONDENSED MATTER, 1986, 64 (02) :189-193

[5] RELATION BETWEEN STRUCTURE AND DOPING IN LA2-XSRXCUO4+DELTA - A NEUTRON-DIFFRACTION STUDY ON SINGLE-CRYSTALS [J].

BRADEN, M ;

SCHWEISS, P ;

HEGER, G ;

REICHARDT, W ;

FISK, Z ;

GAMAYUNOV, K ;

TANAKA, I ;

KOJIMA, H .

PHYSICA C, 1994, 223 (3-4) :396-416

[6] 2-PHASE STRUCTURAL REFINEMENT OF LA2CUO4.032 AT 15 K [J].

CHAILLOUT, C ;

CHENAVAS, J ;

CHEONG, SW ;

FISK, Z ;

MAREZIO, M ;

MOROSIN, B ;

SCHIRBER, JE .

PHYSICA C, 1990, 170 (1-2) :87-94

[7] COMMON INTERATOMIC POTENTIAL MODEL FOR THE LATTICE-DYNAMICS OF SEVERAL CUPRATES [J].

CHAPLOT, SL ;

REICHARDT, W ;

PINTSCHOVIUS, L ;

PYKA, N .

PHYSICAL REVIEW B, 1995, 52 (10) :7230-7242

[8]

*CRYST IMP GBR, 2006, PROGR DIAM 3 1

[9] ABOUT OXOCUPRATES .15. CRYSTAL-STRUCTURE OF RARE-EARTH OXOCUPRATES - LA2CUO4, GD2CUO4 [J].

GRANDE, B ;

MULLERBUSCHBAUM, H ;

SCHWEIZER, M .

ZEITSCHRIFT FUR ANORGANISCHE UND ALLGEMEINE CHEMIE, 1977, 428 (01) :120-124

[10] Structural phase transition and structural properties in oxygenated La2CuO4+y; y ∼ 0.02 [J].

Hidaka, M ;

Tanaka, K ;

Yoshimura, M ;

Ohba, M ;

Yamada, K ;

Wakimoto, H .

PHASE TRANSITIONS, 2001, 74 (04) :391-408

← 1 2 3 →