Synthesis and characterization of single crystalline Gd5(Si,Ge1-x)4 by the Bridgman method

被引：25

作者：

Lograsso, TA ^{[1
]}

Schlagel, DL ^{[1
]}

Pecharsky, AO ^{[1
]}

机构：

[1] Iowa State Univ, Mat & Engn Phys Program, Ames Lab, Ames, IA 50011 USA

来源：

JOURNAL OF ALLOYS AND COMPOUNDS | 2005年 / 393卷 / 1-2期

关键词：

Gd5Si2Ge2; magnetocaloric; magnetically ordered materials; crystal growth; magnetic measurements;

D O I：

10.1016/j.jallcom.2004.09.068

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：

Single crystals of Gd-5(SiGe1-x)(4) have been prepared by the Bridgman method using tungsten crucibles. The tungsten crucible was found to be chemically inert with respect to Gd, Si, Ge but did have limited solubility in liquid Gd5Si2Ge2, resulting in the precipitation of pure tungsten throughout the bulk crystal. Overall, the bulk crystal solidified in the monoclinic phase and a slight increase in Si content and decrease in Ge content at the growth proceeded was found. This increase in Si:Ge ratio resulted in a slight increase in lattice parameter of the monoclinic phase and an increase in the magnetostructural transformation temperature of Delta T=10 K. AC susceptibility measurements indicated a small fraction of orthorhombic phase was present throughout the ingot which accounts for the decrease in MCE values along the length of the ingot. (c) 2004 Elsevier B.V. All rights reserved.

引用

页码：141 / 146

页数：6

共 27 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]

DELANEY DW, 1997, NEW HORIZONS QUASICR, P45

[3] Transformations in the Gd5(Si1.95Ge2.05) alloy induced by the temperature and magnetic-field cycling through the first-order magnetic-martensitic phase transition -: art. no. 064426 [J].

Levin, EM ;

Pecharsky, AO ;

Pecharsky, VK ;

Gschneidner, KA .

PHYSICAL REVIEW B, 2001, 63 (06)

[4] Magnetic-field and temperature dependencies of the electrical resistance near the magnetic and crystallographic first-order phase transition of Gd-5(Si2Ge2) [J].

Levin, EM ;

Pecharsky, VK ;

Gschneidner, KA .

PHYSICAL REVIEW B, 1999, 60 (11) :7993-7997

[5] Magnetic field and temperature-induced first-order transition in Gd5(Si1.5Ge2.5):: a study of the electrical resistance behavior [J].

Levin, EM ;

Pecharsky, VK ;

Gschneidner, KA ;

Tomlinson, P .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 2000, 210 (1-3) :181-188

[6] Pressure-induced three-dimensional ferromagnetic correlations in the giant magnetocaloric compound Gd5Ge4 -: art. no. 207202 [J].

Magen, C ;

Arnold, Z ;

Morellon, L ;

Skorokhod, Y ;

Algarabel, PA ;

Ibarra, MR ;

Kamarad, J .

PHYSICAL REVIEW LETTERS, 2003, 91 (20)

[7] Magnetoelastic behaviour of Gd5Ge4 [J].

Magen, C ;

Morellon, L ;

Algarabel, PA ;

Marquina, C ;

Ibarra, MR .

JOURNAL OF PHYSICS-CONDENSED MATTER, 2003, 15 (14) :2389-2397

[8] Nature of the first-order antiferromagnetic-ferromagnetic transition in the Ge-rich magnetocaloric compounds Gd5(SixGe1-x)4 [J].

Morellon, L ;

Blasco, J ;

Algarabel, PA ;

Ibarra, MR .

PHYSICAL REVIEW B, 2000, 62 (02) :1022-1026

[9] Magnetic-martensitic transition of Tb5Si2Ge2 studied with neutron powder diffraction -: art. no. 024417 [J].

Morellon, L ;

Ritter, C ;

Magen, C ;

Algarabel, PA ;

Ibarra, MR .

PHYSICAL REVIEW B, 2003, 68 (02)

[10] Giant magnetoresistance near the magnetostructural transition in Gd5(Si1.8Ge2.2) [J].

Morellon, L ;

Stankiewicz, J ;

García-Landa, B ;

Algarabel, PA ;

Ibarra, MR .

APPLIED PHYSICS LETTERS, 1998, 73 (23) :3462-3464

← 1 2 3 →