### Abstract

The magnetic Mn^{3+} ions in La_{0.7}Ca_{0.3}MnO_{3} are partially replaced by nonmagnetic Zn^{2+} ions to form La_{0.7}Ca_{0.3}Mn_{1−x}Zn_{x}O_{3} 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 language | English |
---|---|

Pages (from-to) | 18-24 |

Number of pages | 7 |

Journal | Journal of Magnetism and Magnetic Materials |

Volume | 426 |

DOIs | |

Publication status | Published - 2017 Mar 15 |

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### 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

_{0.7}Ca

_{0.3}Mn

_{1−x}Zn

_{x}O

_{3}

*Journal of Magnetism and Magnetic Materials*,

*426*, 18-24. https://doi.org/10.1016/j.jmmm.2016.11.050

**Magnetic and magnetocaloric properties of La _{0.7}Ca_{0.3}Mn_{1−x}Zn_{x}O_{3} .** / Ho, T. A.; Lim, Sang Ho; Tho, P. T.; Phan, T. L.; Yu, S. C.

Research output: Contribution to journal › Article

_{0.7}Ca

_{0.3}Mn

_{1−x}Zn

_{x}O

_{3}',

*Journal of Magnetism and Magnetic Materials*, vol. 426, pp. 18-24. https://doi.org/10.1016/j.jmmm.2016.11.050

_{0.7}Ca

_{0.3}Mn

_{1−x}Zn

_{x}O

_{3}Journal of Magnetism and Magnetic Materials. 2017 Mar 15;426:18-24. https://doi.org/10.1016/j.jmmm.2016.11.050

}

TY - JOUR

T1 - Magnetic and magnetocaloric properties of La0.7Ca0.3Mn1−xZnxO3

AU - Ho, T. A.

AU - Lim, Sang Ho

AU - Tho, P. T.

AU - Phan, T. L.

AU - Yu, S. C.

PY - 2017/3/15

Y1 - 2017/3/15

N2 - 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.

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.

KW - Magnetic phase transformation

KW - Magnetic properties

KW - Magnetocaloric effect

KW - Perovskite manganites

KW - Spin glass

UR - http://www.scopus.com/inward/record.url?scp=84995596090&partnerID=8YFLogxK

UR - http://www.scopus.com/inward/citedby.url?scp=84995596090&partnerID=8YFLogxK

U2 - 10.1016/j.jmmm.2016.11.050

DO - 10.1016/j.jmmm.2016.11.050

M3 - Article

AN - SCOPUS:84995596090

VL - 426

SP - 18

EP - 24

JO - Journal of Magnetism and Magnetic Materials

JF - Journal of Magnetism and Magnetic Materials

SN - 0304-8853

ER -