Thermophysical properties of pyrochlore and fluorite phases in the Ln2Zr2O7-Y2O3 systems (Ln = La, Nd, Sm): 1. Pure pyrochlores and phases in the La2Zr2O7-Y2O3 system

被引：20

作者：

Fabrichnaya, O. ^{[1
]}

Wulf, R. ^{[1
]}

Kriegel, M. J. ^{[1
]}

Savinykh, G. ^{[1
]}

Dopita, M. ^{[1
]}

Seidel, J. ^{[1
]}

Heitz, H. C. ^{[1
]}

Nashed, O. ^{[1
]}

Gross, U. ^{[1
]}

Seifert, H. J. ^{[2
]}

机构：

[1] Tech Univ Bergakad Freiberg, D-09596 Freiberg, Germany

[2] Karlsruhe Inst Technol, Inst Appl Mat, D-76021 Karlsruhe, Germany

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2014年 / 586卷

关键词：

Coating materials; Heat capacity; Heat conduction; Calorimetry; Scanning electron microscopy; THERMAL-CONDUCTIVITY; LANTHANUM; ND2ZR2O7; GADOLINIUM; EVOLUTION; EXPANSION;

D O I：

10.1016/j.jallcom.2013.10.060

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：

Thermal diffusivity was measured by the laser flash method for pyrochlores La2Zr2O7, Nd2Zr2O7, Sm2Zr2O7 synthesized by co-precipitation method and then sintered by conventional sintering at 1600 degrees C and by spark plasma sintering/field assisted sintering technique (SPS/FAST). Thermal conductivity was calculated using heat capacity data available in literature and the results of the present study on thermal diffusivity measurements together with densities determined by Archimedes method. It was demonstrated that samples sintered using the SPS have substantially higher thermal diffusivities and conductivities. It was shown that both thermal diffusivity and conductivity decreases with ionic radius decrease based on the results obtained for SPS prepared samples of Ln(2)Zr(2)O(7) (Ln = La, Nd, Sm). Heat capacity, thermal diffusivity and Archimedes density were measured for phases with pyrochlore and fluorite structure in the La2Zr2O7-Y2O3 system for the first time. It was shown that heat capacity increased while thermal diffusivity and thermal conductivity decreased with increase of Y2O3 content. (C) 2013 Elsevier B. V. All rights reserved.

引用

页码：118 / 128

页数：11

共 33 条

[1] Properties of plasma sprayed La2Zr2O7 coating fabricated from powder synthesized by a single-step solution combustion method [J].

Aruna, S. T. ;

Sanjeeviraja, C. ;

Balaji, N. ;

Manikandanath, N. T. .

SURFACE & COATINGS TECHNOLOGY, 2013, 219 :131-138

[2] Effects of doping on thermal conductivity of pyrochlore oxides for advanced thermal barrier coatings [J].

Bansal, Narottam P. ;

Zhu, Dongming .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2007, 459 (1-2) :192-195

[3] New double-ceramic-layer thermal barrier coatings based on zirconia-rare earth composite oxides [J].

Cao, XQ ;

Vassen, R ;

Tietz, F ;

Stoever, D .

JOURNAL OF THE EUROPEAN CERAMIC SOCIETY, 2006, 26 (03) :247-251

[4] Coprecipitation synthesis and thermal conductivity of La2Zr2O7 [J].

Chen, Hongfei ;

Gao, Yanfeng ;

Liu, Yun ;

Luo, Hongjie .

JOURNAL OF ALLOYS AND COMPOUNDS, 2009, 480 (02) :843-848

[5] Calorimetric investigation of the La2Zr2O7, Nd2Zr2O7, Sm2Zr2O7 and LaYO3 compounds and CALPHAD assessment of the La2O3-Y2O3 system [J].

Fabrichnaya, O. ;

Kriegel, M. J. ;

Seidel, J. ;

Savinykh, G. ;

Ogorodova, L. P. ;

Kiseleva, I. A. ;

Seifert, H. J. .

THERMOCHIMICA ACTA, 2011, 526 (1-2) :50-57

[6] Experimental investigation and thermodynamic modelling in the ZrO2-La2O3-Y2O3 system [J].

Fabrichnaya, O. ;

Savinykh, G. ;

Schreiber, G. ;

Dopita, M. ;

Seifert, H. J. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2010, 493 (1-2) :263-271

[7] Phase relations in the ZrO2-Sm2O3-Y2O3-Al2O3 system: experimental investigation and thermodynamic modelling [J].

Fabrichnaya, Olga ;

Savinykh, Galina ;

Zienert, Tilo ;

Schreiber, Gerhard ;

Seifert, Hans J. .

INTERNATIONAL JOURNAL OF MATERIALS RESEARCH, 2012, 103 (12) :1469-1487

[8] Phase Relations in the ZrO2-Nd2O3-Y2O3 System: Experimental Study and Advanced Thermodynamic Modeling [J].

Fabrichnaya, Olga ;

Savinykh, Galina ;

Schreiber, Gerhard ;

Seifert, Hans J. .

JOURNAL OF PHASE EQUILIBRIA AND DIFFUSION, 2011, 32 (04) :284-297

[9] Thermal conductivity of zirconia-based ceramics for thermal barrier coating [J].

Leclercq, B ;

Mévrel, R ;

Liedtke, V ;

Hohenauer, W .

MATERIALWISSENSCHAFT UND WERKSTOFFTECHNIK, 2003, 34 (04) :406-409

[10] Thermal conductivity and thermal expansion coefficients of the lanthanum rare-earth-element zirconate system [J].

Lehmann, H ;

Pitzer, D ;

Pracht, G ;

Vassen, R ;

Stöver, D .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2003, 86 (08) :1338-1344

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