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 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
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 journal › Article
}
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 -