Structural changes of (K,Gd)2Ta2O7 pyrochlore at high pressure

被引：3

作者：

Zhang, F. X. ^{[1
]}

Lang, M. ^{[1
]}

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

Ewing, R. C. ^{[1
]}

Nyman, M. ^{[2
]}

机构：

[1] Univ Michigan, Dept Geol Sci, Ann Arbor, MI 48109 USA

[2] Sandia Natl Labs, Albuquerque, NM 87185 USA

来源：

JOURNAL OF SOLID STATE CHEMISTRY | 2011年 / 184卷 / 09期

基金：

美国能源部;

关键词：

Tantalate pyrochlore; High pressure; XRD; Raman; INDUCED AMORPHIZATION; NUCLEAR-WASTE; IRRADIATION; PLUTONIUM; IMMOBILIZATION; A(2)B(2)O(7); CERAMICS; DISORDER; LA2ZR2O7; OXIDES;

D O I：

10.1016/j.jssc.2011.06.040

中图分类号：

O61 [无机化学];

学科分类号：

070301 ; 081704 ;

摘要：

The structure of K-bearing tantalate pyrochlore (K2-xGdx)Ta2O6+x(x similar to 0.4) was studied at high pressures using in situ X-ray diffraction and Raman scattering methods. Experimental results indicated that (K2-xGdx)Ta2O6+x(x similar to 0.4) retains the pyrochlore structure up to 40 GPa, but partial amorphization occurred at pressures above 23 GPa. The amorphous phase was also confirmed in the quenched sample by means of transmission electron microscopy. The tantalate pyrochlore lattice is more stable than pyrochlore compounds in other systems, such as rare earth titanates, zirconates and stannates. The structural stability of pyrochlore tantalate may be mainly related to the size ratio of cations on the 16d and 16c sites in the lattice. Published by Elsevier Inc.

引用

页码：2329 / 2332

页数：4

共 37 条

[1] Heavy-ion irradiation effects in Gd2(Ti2-xZrx)O7 pyrochlores [J].

Begg, BD ;

Hess, NJ ;

McCready, DE ;

Thevuthasan, S ;

Weber, WJ .

JOURNAL OF NUCLEAR MATERIALS, 2001, 289 (1-2) :188-193

[2] Synthesis and transport properties of substituted Tl2Mn2O7 pyrochlore [J].

Cheihk-Rouhou, W ;

Strobel, P ;

Chaillout, C ;

Loureiro, SM ;

Senis, R ;

Martinez, B ;

Obradors, X ;

Pierre, J .

JOURNAL OF MATERIALS CHEMISTRY, 1999, 9 (03) :743-748

[3] Nuclear waste disposal-pyrochlore (A2B2O7):: Nuclear waste form for the immobilization of plutonium and "minor" actinides [J].

Ewing, RC ;

Weber, WJ ;

Lian, J .

JOURNAL OF APPLIED PHYSICS, 2004, 95 (11) :5949-5971

[4] Phase relations at 1500°C in the ternary system ZrO2-Gd2O3-TiO2 [J].

Feighery, AJ ;

Irvine, JTS ;

Zheng, C .

JOURNAL OF SOLID STATE CHEMISTRY, 2001, 160 (02) :302-306

[5] Zirconia ceramics for excess weapons plutonium waste [J].

Gong, WL ;

Lutze, W ;

Ewing, RC .

JOURNAL OF NUCLEAR MATERIALS, 2000, 277 (2-3) :239-249

[6]

HAMMERSLEY AP, 1998, COMPUTER PROGRAM FIT

[7] A NOVEL TITANATE-BASED OXYGEN-ION CONDUCTOR - GD2TI2O7 [J].

KRAMERS, SA ;

TULLER, HL .

SOLID STATE IONICS, 1995, 82 (1-2) :15-23

[8] Pressure-induced structural transitions in Tb-pyrochlore oxides [J].

Kumar, RS ;

Cornelius, AL ;

Nicol, MF ;

Kam, KC ;

Cheetham, AK ;

Gardner, JS .

APPLIED PHYSICS LETTERS, 2006, 88 (03) :1-3

[9] Review of A2B2O7 pyrochlore response to irradiation and pressure [J].

Lang, Maik ;

Zhang, Fuxiang ;

Zhang, Jiaming ;

Wang, Jianwei ;

Lian, Jie ;

Weber, William J. ;

Schuster, Beatrice ;

Trautmann, Christina ;

Neumann, R. ;

Ewing, Rodney C. .

NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION B-BEAM INTERACTIONS WITH MATERIALS AND ATOMS, 2010, 268 (19) :2951-2959

[10]

Lang M, 2009, NAT MATER, V8, P793, DOI [10.1038/NMAT2528, 10.1038/nmat2528]

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