### Abstract

Near room temperature, magnetocaloric effect in pristine and Bi-doped Pr_{0.6}Sr_{0.4}MnO_{3} manganites has been studied using in-field heat capacity measurements. The Debye temperature (θ_{D}) for the pristine sample was estimated to be 522 K and its value increases to 530 K for the Bi-doped sample with x=0.05. The entropy associated with paramagnetic (PM) to ferromagnetic (FM) transition is found to be 2.4 J/mol K and 2.3 J/mol K for x=0 and 0.05 compositions respectively. The estimated values of adiabatic temperature ∆T_{ad} for the samples with x=0 and x=0.05 are respectively 2.2 K and 1.9 K for 0-6 Tesla. The maximum isothermal change in entropy, ∆S_{M} for the sample Pr_{0.6}Sr_{0.4}MnO_{3} with transition temperature 306 K is found to be 2.7 J/kg-K with application of external magnetic field of 2 T and for Bi-doped sample (with x=0.05) the isothermal change in entropy reduces to 2.0 J/kg-K. The calculated maximum values of the isothermal entropy changes, ∆S_{M} for the pristine sample, vary in the range 1.7–3.9 J/kg-K for a magnetic field change of 1–6 T. The present results suggest that these compounds can be possible candidates as magnetic refrigerants. This results in a large relative cooling power (RCP) around 93.5 J kg^{−1} K for the pristine sample under an application of magnetic field of 2 T. On contrary, with Bi-doping, RCP decreases to 56 J kg^{−1} K at external field of 2 T.

Original language | English |
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Pages (from-to) | 65-69 |

Number of pages | 5 |

Journal | Solid State Communications |

Volume | 245 |

DOIs | |

Publication status | Published - 01-11-2016 |

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### All Science Journal Classification (ASJC) codes

- Chemistry(all)
- Condensed Matter Physics
- Materials Chemistry

### Cite this

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**Magnetocaloric effect in pristine and Bi-doped Pr _{0.6}Sr_{0.4}MnO_{3} manganite.** / Daivajna, Mamatha D.; Rao, Ashok.

Research output: Contribution to journal › Article

TY - JOUR

T1 - Magnetocaloric effect in pristine and Bi-doped Pr0.6Sr0.4MnO3 manganite

AU - Daivajna, Mamatha D.

AU - Rao, Ashok

PY - 2016/11/1

Y1 - 2016/11/1

N2 - Near room temperature, magnetocaloric effect in pristine and Bi-doped Pr0.6Sr0.4MnO3 manganites has been studied using in-field heat capacity measurements. The Debye temperature (θD) for the pristine sample was estimated to be 522 K and its value increases to 530 K for the Bi-doped sample with x=0.05. The entropy associated with paramagnetic (PM) to ferromagnetic (FM) transition is found to be 2.4 J/mol K and 2.3 J/mol K for x=0 and 0.05 compositions respectively. The estimated values of adiabatic temperature ∆Tad for the samples with x=0 and x=0.05 are respectively 2.2 K and 1.9 K for 0-6 Tesla. The maximum isothermal change in entropy, ∆SM for the sample Pr0.6Sr0.4MnO3 with transition temperature 306 K is found to be 2.7 J/kg-K with application of external magnetic field of 2 T and for Bi-doped sample (with x=0.05) the isothermal change in entropy reduces to 2.0 J/kg-K. The calculated maximum values of the isothermal entropy changes, ∆SM for the pristine sample, vary in the range 1.7–3.9 J/kg-K for a magnetic field change of 1–6 T. The present results suggest that these compounds can be possible candidates as magnetic refrigerants. This results in a large relative cooling power (RCP) around 93.5 J kg−1 K for the pristine sample under an application of magnetic field of 2 T. On contrary, with Bi-doping, RCP decreases to 56 J kg−1 K at external field of 2 T.

AB - Near room temperature, magnetocaloric effect in pristine and Bi-doped Pr0.6Sr0.4MnO3 manganites has been studied using in-field heat capacity measurements. The Debye temperature (θD) for the pristine sample was estimated to be 522 K and its value increases to 530 K for the Bi-doped sample with x=0.05. The entropy associated with paramagnetic (PM) to ferromagnetic (FM) transition is found to be 2.4 J/mol K and 2.3 J/mol K for x=0 and 0.05 compositions respectively. The estimated values of adiabatic temperature ∆Tad for the samples with x=0 and x=0.05 are respectively 2.2 K and 1.9 K for 0-6 Tesla. The maximum isothermal change in entropy, ∆SM for the sample Pr0.6Sr0.4MnO3 with transition temperature 306 K is found to be 2.7 J/kg-K with application of external magnetic field of 2 T and for Bi-doped sample (with x=0.05) the isothermal change in entropy reduces to 2.0 J/kg-K. The calculated maximum values of the isothermal entropy changes, ∆SM for the pristine sample, vary in the range 1.7–3.9 J/kg-K for a magnetic field change of 1–6 T. The present results suggest that these compounds can be possible candidates as magnetic refrigerants. This results in a large relative cooling power (RCP) around 93.5 J kg−1 K for the pristine sample under an application of magnetic field of 2 T. On contrary, with Bi-doping, RCP decreases to 56 J kg−1 K at external field of 2 T.

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U2 - 10.1016/j.ssc.2016.07.019

DO - 10.1016/j.ssc.2016.07.019

M3 - Article

VL - 245

SP - 65

EP - 69

JO - Solid State Communications

JF - Solid State Communications

SN - 0038-1098

ER -