Magnetic and magnetocaloric properties of La0.7Ca0.3Mn1−xZnxO3

T. A. Ho, Sang Ho Lim, P. T. Tho, T. L. Phan, S. C. Yu

Research output: Contribution to journalArticle

4 Citations (Scopus)

Abstract

The magnetic Mn3+ ions in La0.7Ca0.3MnO3 are partially replaced by nonmagnetic Zn2+ ions to form La0.7Ca0.3Mn1−xZnxO3 compounds (x=0.0, 0.06, 0.08, and 0.1), and their magnetic and magnetocaloric properties are investigated. The Curie temperature decreases drastically from 245 to 70 K as x increases from 0 to 0.1. An analysis using the Banerjee's criterion of the experimental results for magnetization as a function of temperature and magnetic field indicates that the first-to-second order magnetic phase transformation occurs at a threshold composition of x=0.06, which is further supported by the universal curves of the normalized entropy change versus reduced temperature. The maximum magnetic entropy change measured at a magnetic field span of 50 kOe, which occurs near the Curie temperature, decreases from 10.30 to 2.15 J/kg K with the increase of x from 0.0 to 0.1. However, the relative cooling power, an important parameter for practical applications, shows a maximum value of 404 J/kg at x=0.08, which is 1.5 times greater than that observed for the undoped sample.

Original languageEnglish
Pages (from-to)18-24
Number of pages7
JournalJournal of Magnetism and Magnetic Materials
Volume426
DOIs
Publication statusPublished - 2017 Mar 15

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Curie temperature
Entropy
Ions
entropy
Magnetic fields
magnetic properties
magnetic fields
phase transformations
Magnetization
ions
Temperature distribution
temperature distribution
Phase transitions
Cooling
cooling
magnetization
thresholds
curves
Chemical analysis
Temperature

Keywords

  • Magnetic phase transformation
  • Magnetic properties
  • Magnetocaloric effect
  • Perovskite manganites
  • Spin glass

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics

Cite this

Magnetic and magnetocaloric properties of La0.7Ca0.3Mn1−xZnxO3 . / Ho, T. A.; Lim, Sang Ho; Tho, P. T.; Phan, T. L.; Yu, S. C.

In: Journal of Magnetism and Magnetic Materials, Vol. 426, 15.03.2017, p. 18-24.

Research output: Contribution to journalArticle

Ho, T. A. ; Lim, Sang Ho ; Tho, P. T. ; Phan, T. L. ; Yu, S. C. / Magnetic and magnetocaloric properties of La0.7Ca0.3Mn1−xZnxO3 In: Journal of Magnetism and Magnetic Materials. 2017 ; Vol. 426. pp. 18-24.
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AU - Yu, S. C.

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AB - The magnetic Mn3+ ions in La0.7Ca0.3MnO3 are partially replaced by nonmagnetic Zn2+ ions to form La0.7Ca0.3Mn1−xZnxO3 compounds (x=0.0, 0.06, 0.08, and 0.1), and their magnetic and magnetocaloric properties are investigated. The Curie temperature decreases drastically from 245 to 70 K as x increases from 0 to 0.1. An analysis using the Banerjee's criterion of the experimental results for magnetization as a function of temperature and magnetic field indicates that the first-to-second order magnetic phase transformation occurs at a threshold composition of x=0.06, which is further supported by the universal curves of the normalized entropy change versus reduced temperature. The maximum magnetic entropy change measured at a magnetic field span of 50 kOe, which occurs near the Curie temperature, decreases from 10.30 to 2.15 J/kg K with the increase of x from 0.0 to 0.1. However, the relative cooling power, an important parameter for practical applications, shows a maximum value of 404 J/kg at x=0.08, which is 1.5 times greater than that observed for the undoped sample.

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