The influence of the sintering temperature on the structural and the magnetic properties of doped manganites: La0.95Ag0.05MnO3 and La0.75Ag0.25MnO3

Irmak, A.E.; Coşkun, Atilla; Taşarkuyu, E.; Aktürk, Selçuk; Ünlü, Cumhur Gökhan; Samancıoğlu, Y.; Sarıkürkçü, Cengiz; Kaynar, M. Burak; Yücel, A.

doi:10.1016/j.jmmm.2009.11.029

Cited by 34 publications

(4 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…However, it is worth noting that nonstoichiometric systems likely affect their magnetic properties and could explain the dispersion of the reported data. Several factors apart from compositional changes affect MCE signal: grain size (75)(76)(77), chemical order (78)(79)(80), sintering temperature (81,82), and pressure application (83).…”

Section: Ferromagnetic Lanthanum Manganitesmentioning

confidence: 99%

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

Franco

Blázquez

Ingale

et al. 2012

Annu. Rev. Mater. Res.

1,003

447

View full text Add to dashboard Cite

In the past 20 years, there has been a surge in research on the magnetocaloric response of materials, due mainly to the possibility of applying this effect for magnetic refrigeration close to room temperature. This review is devoted to the main families of materials suitable for this application and to the procedures proposed to predict their response. Apart from the possible technological applications, we also discuss the use of magnetocaloric characterization to gain fundamental insight into the nature of the underlying phase transition.

show abstract

Section: Ferromagnetic Lanthanum Manganitesmentioning

confidence: 99%

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

Franco

Blázquez

Ingale

et al. 2012

Annu. Rev. Mater. Res.

1,003

447

View full text Add to dashboard Cite

show abstract

“…As is seen in the inset (b) of Fig. 1 It should be noted that the low-temperature magnetization of the non-stoichiometric manganites with x = 0.05-0.2 is lower as compared to the M FC magnetization of manganites with stoichiometric content [13].…”

Section: Magnetic Propertiesmentioning

confidence: 86%

“…The La 1-x Ag x MnO 3 manganites are the example of such group of compounds in the case of the substitution of La 3+ ions for monovalence ions [13]. ).…”

Section: Introductionmentioning

confidence: 99%

Magnetic and magnetocaloric properties of the La0.9−xAgxMn1.1O3 compounds

Zubov

Pashchenko

Nedelko

et al. 2017

Low Temperature Physics

View full text Add to dashboard Cite

The influence of Ag + ions and Mn non-stoichiometry on the magnetic properties and magnetocaloric effect in the La 0.9-x Ag x Mn 1.1 O 3 compounds has been studied. The Ag + ions content substituting for trivalent lanthanum ions was varied from x = 0.05 to 0.3. Magnetic measurements have been performed over a wide temperature (350-5 K) and magnetic field (up to 5 T) ranges. All the manganites studied show the ferromagnetic-like ordering with a first order magnetic phase transition. The magnetic entropy changes were evaluated from the isothermal curves of magnetization versus an applied magnetic field using both the thermodynamic Maxwell relation (MR) and calculation based on the Landau theory of phase transitions. The largest values of the magnetocaloric effect as well as the relative cooling power among the studied manganites are equal to 5.76 J/(kg•K) and 185 J/kg, respectively, for La 0.7 Ag 0.2 Mn 1.1 O 3 in the magnetic field change of 5 T near the Curie temperature of T C = 271 K. A good correlation between the magnetization, colossal magnetoresistance and magnetic entropy changes as a function of Ag concentration in the La 0.9-x Ag x Mn 1.1 O 3 manganites was established.

show abstract

“…That is why these studies suggest that other effects play a crucial role, such as the average A-site cationic radius r A [4][5][6][7][8], the oxygen deficiency [9][10][11][12][13] and the annealing temperature [14][15][16]. Experimentally, the physical properties of manganese oxides composition can be modified by the substitution of an ion by one or more other ions, making the preparation more difficult and expensive.…”

Section: Introductionmentioning

confidence: 99%

Preparation of New Composite Magnetocaloric Compounds by Modifying the Annealing Temperature of La0.8Ca0.2−x □ x MnO3 Perovskite

Khlifi

Bejar

Dhahri

et al. 2011

J Supercond Nov Magn

View full text Add to dashboard Cite

In this paper, a new method to broaden the range of the magnetic refrigeration temperature by changing the annealing temperature was proposed. Series of La 0.8 Ca 0.2−x x MnO 3 (0.00 ≤ x ≤ 0.20) compounds were prepared by solid-state reaction and annealed firstly at a temperature of 1473 K (S1) and then at 1073 K (S2). Morphologic and structural studies have revealed that the decrease of the annealing temperature modifies the grain size and the structure of these compounds. The magnetic measurements have shown that the annealing at low temperature (1073 K) increases the magnetization and enhances the oneelectron bandwidth, which induces an increase of the Curie temperature for 183 K (S1) to 241 K (S2) for the x = 0.00 sample. The magnetocaloric investigation has exposed that the decrease of the annealing temperature induces a change from a second-order magnetic phase transition to first-order one for S1 and S2 compounds, respectively. Also, we have found that the Relative Cooling Power (RCP) factor remains almost constant as a function of calcium-deficiency concentration (x) and the annealing temperature. Finally, we have deduced that we can use composite magnetocaloric compounds, exploiting a mixing of the same compounds annealed at two different temperatures (1473 K; S1) and (1073 K; S2), for refrigeration over the temperature range 175-264 K.

show abstract

The influence of the sintering temperature on the structural and the magnetic properties of doped manganites: La0.95Ag0.05MnO3 and La0.75Ag0.25MnO3

Cited by 34 publications

References 23 publications

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

The Magnetocaloric Effect and Magnetic Refrigeration Near Room Temperature: Materials and Models

Magnetic and magnetocaloric properties of the La0.9−xAgxMn1.1O3 compounds

Preparation of New Composite Magnetocaloric Compounds by Modifying the Annealing Temperature of La0.8Ca0.2−x □ x MnO3 Perovskite

Contact Info

Product

Resources

About