Single crystal study of the high-Curie-temperature ferromagnet Gd1.02Sc0.98Ge and of Gd2.38Sc2.62Ge3

被引：20
作者：
Manfrinetti, P
Pani, M
Palenzona, A
Dhar, SK
Singh, S
机构：
[1] INFM, I-16146 Genoa, Italy
[2] Dipartimento Chim & Chim Ind, I-16146 Genoa, Italy
[3] TIFR, CMP & MS, Bombay 400005, Maharashtra, India
来源：
JOURNAL OF ALLOYS AND COMPOUNDS | 2002年 / 334卷
关键词：
rare earth compounds; crystal structure; X-ray diffraction; magnetic measurements;
D O I：
10.1016/S0925-8388(01)01752-2
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：
The title ternary compounds have been thoroughly studied by X-ray diffraction, both on powders and single crystals. The already reported GdScGe does not form exactly at the equiatomic composition but with a stoichiometry slightly richer in Gd: Gd1.02Sc0.98Ge; it crystallizes with the tetragonal CeScSi-type (ordered La2Sb-type, space group 14/mmm) with a=4.261 (1) and c=15.593(5) Angstrom Gd2.38Sc2.62Ge3 is hexagonal, Mn5Si3-type (space group P6(3)/mcm), with cell parameters a=8.276(5) and c=6.116(6) Angstrom. Magnetic measurements show that Gd1.02Sc0.98Ge undergoes a ferromagnetic transition at T-c=350 K, whilst no evidence of long range magnetic ordering has been detected for Gd2.38Sc2.62Ge, from 1.5 to 60 K, as deduced by preliminary heat capacity data. (C) 2002 Elsevier Science BY All rights reserved.
引用
收藏
页码：9 / 13
页数：5
相关论文
共 11 条
[1]  
BODAK OI, 1983, INORG MATER+, V19, P987
[2]   CRYSTAL STRUCTURE AND MAGNETIC PROPERTIES OF SOME RARE EARTH GERMANIDES [J].
BUSCHOW, KHJ ;
FAST, JF .
PHYSICA STATUS SOLIDI, 1967, 21 (02) :593-+
[3]   Magnetic refrigeration materials (invited) [J].
Gschneidner, KA ;
Pecharsky, VK .
JOURNAL OF APPLIED PHYSICS, 1999, 85 (08) :5365-5368
[4]  
MOKRA IR, 1979, DOKL AKAD NAUK UKR A, V41, P314
[5]   Crystallographic data of new ternary Sm5Ge4-type R2Ti3Ge4 compounds (R=Gd-Er) [J].
Morozkin, AV ;
Seropegin, YD ;
Portnoy, VK ;
Leonov, AV ;
Sviridov, IA .
JOURNAL OF ALLOYS AND COMPOUNDS, 1998, 278 (1-2) :L8-L9
[6]   CeScSi- and CeFeSi-type structures in compounds derived from GdTiGe [J].
Morozkin, AV ;
Viting, LM ;
Sviridov, IA ;
Tskhadadze, IA .
JOURNAL OF ALLOYS AND COMPOUNDS, 2000, 297 (1-2) :168-175
[7]   A SEMI-EMPIRICAL METHOD OF ABSORPTION CORRECTION [J].
NORTH, ACT ;
PHILLIPS, DC ;
MATHEWS, FS .
ACTA CRYSTALLOGRAPHICA SECTION A-CRYSTAL PHYSICS DIFFRACTION THEORETICAL AND GENERAL CRYSTALLOGRAPHY, 1968, A 24 :351-&
[8]  
Sheldrick G.M., 1993, PROGRAM CRYSTAL STRU
[9]   The nature of magnetism in CeScSi and CeScGe [J].
Singh, S ;
Dhar, SK ;
Mitra, C ;
Paulose, P ;
Manfrinetti, P ;
Palenzona, A .
JOURNAL OF PHYSICS-CONDENSED MATTER, 2001, 13 (16) :3753-3766
[10]   High rare earth sublattice ordering temperatures in new CeFeSi-type RTiGe(R≡La-Nd, Sm) compounds [J].
Welter, R ;
Vernière, A ;
Venturini, G ;
Malaman, B .
JOURNAL OF ALLOYS AND COMPOUNDS, 1999, 283 (1-2) :54-58
12