Dependence of the magnetocaloric effect on oxygen stoichiometry in polycrystalline La2/3Ba1/3MnO3-δ

被引：92

作者：

Zhong, W ^{[1
]}

Chen, W

Au, CT

Du, YW

机构：

[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Peoples R China

[2] Heibei Normal Univ, Dept Phys, Shijiazhuang 050091, Peoples R China

[3] Hong Kong Baptist Univ, Dept Chem, Kowloon, Hong Kong, Peoples R China

[4] Hong Kong Baptist Univ, Ctr Surface Anal & Res, Kowloon, Hong Kong, Peoples R China

来源：

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS | 2003年 / 261卷 / 1-2期

基金：

中国国家自然科学基金;

关键词：

sol-gel synthesis; perovskite manganites; oxygen stoichiometry; magnetocaloric effect;

D O I：

10.1016/S0304-8853(02)01479-8

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Polycrystalline perovskites La2/3Ba1/3MnO3-delta with different oxygen deficiency delta(0less than or equal todeltaless than or equal to0.10) have been prepared by a modified sol-gel method and their Curie temperatures and magnetocaloric effect have been studied. A close relationship is confirmed to hold between the Curie temperature and the oxygen stoichiometry. The maximum magnetic entropy change is in the order of 2.7 J/kg K and peaks at Curie temperature for La2/3Ba1/3MnO3 upon 10kOe applied field change. For the samples with oxygen deficiency, a reduction of the maximum magnetic entropy change has been observed. (C) 2002 Elsevier Science B.V. All rights reserved.

引用

页码：238 / 243

页数：6

共 30 条

[1] Effects of the oxygen nonstoichiometry on the physical properties of La0.7Sr0.3MnO3-δ□δ manganites (0≤δ≤0.15) [J].

Abdelmoula, N ;

Guidara, K ;

Cheikh-Rouhou, A ;

Dhahri, E ;

Joubert, JC .

JOURNAL OF SOLID STATE CHEMISTRY, 2000, 151 (01) :139-144

[2] Magnetocaloric effect in La0.65Ca0.35Ti1-xMnxO3 ceramic perovskites [J].

Bohigas, X ;

del Barco, E ;

Sales, M ;

Tejada, J .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 196 :455-457

[3] Cation size-temperature phase diagram of the manganites Ln(0.5)Sr(0.5)MnO(3) [J].

Damay, F ;

Maignan, A ;

Martin, C ;

Raveau, B .

JOURNAL OF APPLIED PHYSICS, 1997, 81 (03) :1372-1377

[4] Cation disorder and size effects upon magnetic transitions in Ln0.5A0.5MnO3 manganites [J].

Damay, F ;

Martin, C ;

Maignan, A ;

Raveau, B .

JOURNAL OF APPLIED PHYSICS, 1997, 82 (12) :6181-6185

[5] EFFECTS OF DOUBLE EXCHANGE IN MAGNETIC CRYSTALS [J].

DEGENNES, PG .

PHYSICAL REVIEW, 1960, 118 (01) :141-154

[6] Large magnetic entropy change in perovskite-type manganese oxides [J].

Guo, ZB ;

Du, YW ;

Zhu, JS ;

Huang, H ;

Ding, WP ;

Feng, D .

PHYSICAL REVIEW LETTERS, 1997, 78 (06) :1142-1145

[7] Influence of oxygen vacancies on magnetoresistance properties of bulk La0.67Ca0.33MnO3-δ [J].

Hossain, AKMA ;

Cohen, LF ;

Kodenkandeth, T ;

MacManus-Driscoll, J ;

Alford, NM .

JOURNAL OF MAGNETISM AND MAGNETIC MATERIALS, 1999, 195 (01) :31-36

[8] TEMPERATURE PROGRAMMED REDUCTION [J].

HURST, NW ;

GENTRY, SJ ;

JONES, A ;

MCNICOL, BD .

CATALYSIS REVIEWS-SCIENCE AND ENGINEERING, 1982, 24 (02) :233-309

[9] LATTICE EFFECTS ON THE MAGNETORESISTANCE IN DOPED LAMNO3 [J].

HWANG, HY ;

CHEONG, SW ;

RADAELLI, PG ;

MAREZIO, M ;

BATLOGG, B .

PHYSICAL REVIEW LETTERS, 1995, 75 (05) :914-917

[10] LARGE MAGNETORESISTANCE IN POLYCRYSTALLINE LA-Y-CA-MN-O [J].

JIN, S ;

OBRYAN, HM ;

TIEFEL, TH ;

MCCORMACK, M ;

RHODES, WW .

APPLIED PHYSICS LETTERS, 1995, 66 (03) :382-384

← 1 2 3 →