Thermophysical properties of pyrochlore and fluorite phases in the Ln2Zr2O7-Y2O3 systems (Ln = La, Nd, Sm): 2. Comparison of conventionally sintered and SPS samples in the systems Nd2Zr2O7-Y2O3 and Sm2Zr2O7-Y2O3

被引：11

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 | 2015年 / 625卷

关键词：

Coating materials; Heat capacity; Heat conduction; Calorimetry; Scanning electron microscopy; THERMAL BARRIER COATINGS; CONDUCTIVITY; OXIDES; CERAMICS; X=0;

D O I：

10.1016/j.jallcom.2014.11.133

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 diffusivities of pyrochlore and fluorite phases in the Nd2Zr2O7-Y2O3 and Sm2Zr2O7-Y2O3 systems were measured using the laser flash method for the first time. Samples synthesized by co-precipitation were sintered by conventional sintering at 1600 degrees C or by spark plasma sintering/field assisted sintering technique (SPS). Thermal conductivity was calculated based on thermal diffusivity data, heat capacity data measured by differential scanning calorimetry (DSC) and densities measured using the Archimedes method. Thermal diffusivity and conductivity in the Nd2Zr2O7-Y2O3 system demonstrated similar dependencies on the Y2O3 content as were observed for the La2Zr2O7-Y2O3 system: the highest values were indicated for most ordered Nd2Zr2O4 pyrochlore whereas the lowest were observed for the disordered fluorite structure containing more Y2O3 than pyrochlore. However the thermal diffusivity and conductivity dependencies in the Sm2Zr2O7-Y2O3 were different - the highest values were measured for fluorite phase having higher Y2O3 content. (C) 2014 Elsevier B.V. All rights reserved.

引用

页码：200 / 207

页数：8

共 27 条

[1] Growth of Intricate ZnO Nanorod Networks on α-Fe2O3-Coated Si Substrate: Growth Mechanism and Optical Properties [J].

Cui, Yinfang ;

Wang, Cong ;

Wu, Sujuan ;

Jia, Yuping ;

Zhang, Fangfang ;

Wang, Tianmin ;

Liu, Gang .

JOURNAL OF THE AMERICAN CERAMIC SOCIETY, 2011, 94 (07) :1992-1994

[2] 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 [J].

Fabrichnaya, O. ;

Wulf, R. ;

Kriegel, M. J. ;

Savinykh, G. ;

Dopita, M. ;

Seidel, J. ;

Heitz, H. C. ;

Nashed, O. ;

Gross, U. ;

Seifert, H. J. .

JOURNAL OF ALLOYS AND COMPOUNDS, 2014, 586 :118-128

[3] 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

[4] 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

[5] 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

[6] 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

[7] 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

[8] 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

[9] Emerging materials and processes for thermal barrier systems [J].

Levi, CG .

CURRENT OPINION IN SOLID STATE & MATERIALS SCIENCE, 2004, 8 (01) :77-91

[10] Preparation and thermophysical properties of (Nd x Gd1-x )2Zr2O7 ceramics [J].

Liu, Zhan-Guo ;

Ouyang, Jia-Hu ;

Zhou, Yu .

JOURNAL OF MATERIALS SCIENCE, 2008, 43 (10) :3596-3603

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