Magnetic properties of a metal-organic chain system [Co (bpdc) (H 2O) 2] · H 2O (bpdc=biphenyldicarboxylate)

Tan Yuen, C. L. Lin, J. A. Zan, Long Pan, Jing Li

Research output: Contribution to journalArticle

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Abstract

The magnetic properties of a recently discovered metal-organic magnetic chain compound, [Co (bpdc) (H2 O)2] · H2 O, were investigated using measurements of magnetic susceptibility M (T) H, isothermal magnetization M (H), and heat capacity C (T). The room temperature crystal structure of [Co (bpdc) (H2 O)2] · H2 O is monoclinic, space group C2c, with lattice parameters a=6.950 Å, b=31.585 Å, c=6.226 Å, and Β=95.84°. The M (T) H data above 40 K were fit to Curie-Weiss law with an effective moment of 5.37 μB and a Curie-Weiss temperature of +26 K. A spontaneous antiferromagnetic ordering with a transition temperature of 5.5 K was observed in the low field M (T) H data. In addition, a metamagnetic transition at 500 G was found in M (H), measured at 2 K. The sizable anomaly observed in C (T) confirms the magnetic phase transition and the transition temperature. The total magnetic entropy removal at 5.5 K is 800 mJmol K. The nature of the magnetic properties is discussed in terms of the ferromagnetic intrachain exchange interaction between the Co(II) ions through the bridging hydrogen atoms along the magnetic chain and the antiferromagnetic Co-Co interchain coupling.

Original languageEnglish
Article number10B315
JournalJournal of Applied Physics
Volume97
Issue number10
DOIs
Publication statusPublished - May 15 2005

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transition temperature
magnetic properties
Curie-Weiss law
metals
lattice parameters
hydrogen atoms
specific heat
entropy
anomalies
moments
magnetic permeability
magnetization
crystal structure
room temperature
ions
interactions
temperature

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)
  • Physics and Astronomy(all)

Cite this

Magnetic properties of a metal-organic chain system [Co (bpdc) (H 2O) 2] · H 2O (bpdc=biphenyldicarboxylate). / Yuen, Tan; Lin, C. L.; Zan, J. A.; Pan, Long; Li, Jing.

In: Journal of Applied Physics, Vol. 97, No. 10, 10B315, 15.05.2005.

Research output: Contribution to journalArticle

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abstract = "The magnetic properties of a recently discovered metal-organic magnetic chain compound, [Co (bpdc) (H2 O)2] · H2 O, were investigated using measurements of magnetic susceptibility M (T) H, isothermal magnetization M (H), and heat capacity C (T). The room temperature crystal structure of [Co (bpdc) (H2 O)2] · H2 O is monoclinic, space group C2c, with lattice parameters a=6.950 {\AA}, b=31.585 {\AA}, c=6.226 {\AA}, and Β=95.84°. The M (T) H data above 40 K were fit to Curie-Weiss law with an effective moment of 5.37 μB and a Curie-Weiss temperature of +26 K. A spontaneous antiferromagnetic ordering with a transition temperature of 5.5 K was observed in the low field M (T) H data. In addition, a metamagnetic transition at 500 G was found in M (H), measured at 2 K. The sizable anomaly observed in C (T) confirms the magnetic phase transition and the transition temperature. The total magnetic entropy removal at 5.5 K is 800 mJmol K. The nature of the magnetic properties is discussed in terms of the ferromagnetic intrachain exchange interaction between the Co(II) ions through the bridging hydrogen atoms along the magnetic chain and the antiferromagnetic Co-Co interchain coupling.",
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AB - The magnetic properties of a recently discovered metal-organic magnetic chain compound, [Co (bpdc) (H2 O)2] · H2 O, were investigated using measurements of magnetic susceptibility M (T) H, isothermal magnetization M (H), and heat capacity C (T). The room temperature crystal structure of [Co (bpdc) (H2 O)2] · H2 O is monoclinic, space group C2c, with lattice parameters a=6.950 Å, b=31.585 Å, c=6.226 Å, and Β=95.84°. The M (T) H data above 40 K were fit to Curie-Weiss law with an effective moment of 5.37 μB and a Curie-Weiss temperature of +26 K. A spontaneous antiferromagnetic ordering with a transition temperature of 5.5 K was observed in the low field M (T) H data. In addition, a metamagnetic transition at 500 G was found in M (H), measured at 2 K. The sizable anomaly observed in C (T) confirms the magnetic phase transition and the transition temperature. The total magnetic entropy removal at 5.5 K is 800 mJmol K. The nature of the magnetic properties is discussed in terms of the ferromagnetic intrachain exchange interaction between the Co(II) ions through the bridging hydrogen atoms along the magnetic chain and the antiferromagnetic Co-Co interchain coupling.

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