Microstructural analysis of twinned β-Gd5Si2Ge2 -: art. no. 012106

被引：0
作者：
Meyers, J
Chumbley, S
Choe, W
Miller, GJ [1 ]
机构：
[1] Iowa State Univ, Ames Lab, US Dept Energy, Ames, IA 50011 USA
[2] Iowa State Univ, Dept Mat Sci & Engn, Ames, IA 50011 USA
[3] Iowa State Univ, Dept Chem, Ames, IA 50011 USA
来源：
PHYSICAL REVIEW B | 2002年 / 66卷 / 01期
关键词：
D O I：
暂无
中图分类号：
T [工业技术];
学科分类号：
08 ;
摘要：
The room-temperature microstructure of the giant magnetocaloric material Gd5Si2Ge2 is investigated using transmission electron microscopy and selected area diffraction. Nonmerohedral twinning is identified and its twin law, which relates one twin component to the other, is revealed. Based on selected area diffraction pattern data, we build a structural model for nonmerohedral twinning and explain its origin in terms of the irregular shear movement of two-dimensional (infinity)(2)[Gd-5(Si2Ge2)] slabs held together by (Si,Ge) dimers.
引用
收藏
页数：3
相关论文
共 14 条
[1]   Making and breaking covalent bonds across the magnetic transition in the giant magnetocaloric material Gd5(Si2Ge2) [J].
Choe, W ;
Pecharsky, VK ;
Pecharsky, AO ;
Gschneidner, KA ;
Young, VG ;
Miller, GJ .
PHYSICAL REVIEW LETTERS, 2000, 84 (20) :4617-4620
[2]   Crystal structures of nitronium tetranitratogallate and its reversible solid-state phase transition mediated by nonmerohedral twinning [J].
Colombo, DG ;
Young, VG ;
Gladfelter, WL .
INORGANIC CHEMISTRY, 2000, 39 (20) :4621-4624
[3]   Refinement of twinned structures with SHELXL97 [J].
Herbst-Irmer, R ;
Sheldrick, GM .
ACTA CRYSTALLOGRAPHICA SECTION B-STRUCTURAL SCIENCE, 1998, 54 :443-449
[4]  
Ivtchenko V.V., 2000, ADV CRYOGEN ENG, V46, P405
[5]  
MEYERS JS, 2001, 10 INT S PROC FABR A
[6]   Effect of alloying on the giant magnetocaloric effect of Gd-5(Si2Ge2) [J].
Pecharsky, VK ;
Gschneidner, KA .
JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1997, 167 (03) :L179-L184
[7]   Giant magnetocaloric effect in Gd-5(Si2Ge2) [J].
Pecharsky, VK ;
Gschneidner, KA .
PHYSICAL REVIEW LETTERS, 1997, 78 (23) :4494-4497
[8]   Phase relationships and crystallography in the pseudobinary system Gd5Si4-Gd5Ge4 [J].
Pecharsky, VK ;
Gschneider, KA .
JOURNAL OF ALLOYS AND COMPOUNDS, 1997, 260 (1-2) :98-106
[9]   Tunable magnetic regenerator alloys with a giant magnetocaloric effect for magnetic refrigeration from similar to 20 to similar to 290 K [J].
Pecharsky, VK ;
Gschneidner, KA .
APPLIED PHYSICS LETTERS, 1997, 70 (24) :3299-3301
[10]   Variable-temperature X-ray structural investigation of {Fe[HC(3,5-Me2pz)3]2}(BF4)2 (pz = pyrazolyl ring):: Observation of a thermally induced spin state change from all high spin to an equal high spin-low spin mixture, concomitant with the onset of nonmerohedral twinning [J].
Reger, DL ;
Little, CA ;
Young, VG ;
Maren, P .
INORGANIC CHEMISTRY, 2001, 40 (12) :2870-2874
12