99Gd0．01Al2金属间化合物的声学和比热容性质研究

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Sm 0
．
99Gd0．01Al2金属间化合物的声学和比热容性质研究
苏金瑞·)王克勤z)屈继锋·)朱长飞·
1)中国科学技术大学材料科学与工程系内耗与固体缺陷实验室，合肥230026
2)中国科学技术大学理学院，合肥230026
摘要用感应悬浮冷坩锅法制备了单相性良好的Sm0．99Gdo．erAl2多晶金属间化合物．对其低温的声学和比热容性质进行
了研究，得到了样品模量和声衰减以及随温度变化的规律．研究表明，在磁相变附近，样品的声学性质有剧烈的反常现象．比热容
测量的结果表明这是一个二级相变．结合样品的磁性性质，对其声学特性进行了分析．
关键词金属间化合物Sni0．99GdoolA12，模量，声衰减，比热容
中图法分类号TG146．45，0429文献标识码A文章编号0412—1961(2003)l1一l186—03
ACoU STICAL PRoPERTIES A N D SPECIFIC H EAT
CAPACITY oF Sm o
．
99Gdo
．
01Al2IN TERM ETALLICS
SUJin~uiu NG Keqin．QUJifengu．ZHU Changfei1)
1)KeyLaboratoryofInternalFrictionandDefectsinSolids，DepartmentofMaterialsScienceandEngineering，University
ofScienceand Technology ofChina，Hehi230026
2)SchoolofScience，UniversityofScienceandTechnoloyg ofChina，Hefei230026
Correspondent：SUJinrui，fecturer,Teh(o551)3602939，Fax：(o551)s6o,94o，E．mail：jrsu@ustc．edu．cn
SupportedbyN口tionalN口ruralScienceFoundationoIChina(No．500010111andYouthFoundation
Df iversityofScienceandTechnologyofChina
M anuscript receiv。ed 2003-07-0—9
AB STR ACT Polycrystalline Sm0
．99Gd0
．olA12 with single phase structure was prepared by cold
crucible induction levitation method．The acousticalpropertiesand specific healt ofsam ple atlow
temperat．ures were studied，and the temperature dependences ofmodulus，sound attenuation and
specificheatwereobtained．Theresultsshow thattheacousticalpropertiesofsampledisplayenormous
anom aliesinthevicinityofmagneticphas etransition．Speciifcheatresultsm anifestthem agneticphsae
transition tobeasecond orderone．Analysiswasm adetotheacousticalpropertieswith consideration
ofitsmagneticproperties．
K EY、Vo R D S interm etallicsSm0
．
99Gd0
．
01A12，modulus，sound attenuation，speciifc heatcapacity