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First and second differentials of the ultrasonic parameter as an effective tool to identify phase transitions in R1-xAxMnO3 perovskites

  • Singer Muthu Kumaran and Venkatachalam Rajendran
Published/Copyright: May 31, 2013
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International Journal of Materials Research
From the journal International Journal of Materials Research Volume 103 Issue 12

Abstract

In order to examine the existence of different phase transitions, the ultrasonic longitudinal modulus (L) and its first (ΔL/ΔT) and second (Δ2L/Δ2T) differentials have been established for two different perovskite manganites over a wide range of temperatures, La0.67Sr0.33MnO3 from 460 to 300 K and Nd0.67Sr0.33MnO3 300 to 150 K. The anomalies in L and its differentials at TC (≈378 K) in La0.67Sr0.33MnO3 are due to the ferromagnetic metal transition; the changes at TC (≈234 K), TCO (≈194 K) in Nd0.67Sr0.33MnO3 represent the ferromagnetic transition and charge ordering transition respectively. The existing phase transitions are due to a strong electron-phonon interaction arising from the Jahn-Teller effect and spin-phonon interaction from the linear magnetostriction effect. The first (ΔL/ΔT) and second (Δ2L/Δ2T) differentials of L are identified as an effective approach for the clear identification/detection of different phase transitions in the above systems over a wide range of temperatures.

Keywords: Ultrasonic parameters; Phase transitions; R1-xAxMnO3 perovskites
* Correspondence address, Singer Muthu Kumaran, Assistant Professor, Department of Physics, H.H. The Rajah's College, Pudukkottai, Tamilnadu, India. Tel.: +91-04322-221558, Fax: +91-04322-230490, E-mail:

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Received: 2011-7-2
Accepted: 2012-6-12
Published Online: 2013-05-31
Published in Print: 2012-12-01

© 2012, Carl Hanser Verlag, München

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https://doi.org/10.3139/146.110811
Keywords for this article
Ultrasonic parameters; Phase transitions; R1-xAxMnO3 perovskites

Articles in the same Issue

  1. Contents
  2. Contents
  3. Original Contributions
  4. Effect of texture on grain growth in an interstitial-free steel sheet
  5. Nanoindentation of pseudoelastic NiTi containing Ni4Ti3 precipitates
  6. Isochronal annealing of a deformed Fe-7.5 mass.% Si-steel
  7. Modelling of three powder compaction laws for cold die pressing
  8. Surface tension and density of liquid Sn–Ag–Cu alloys
  9. Thermodynamics of liquid Au–Sb–Sn
  10. Phase relations in the ZrO2-Sm2O3-Y2O3-Al2O3 system: experimental investigation and thermodynamic modelling
  11. Contributions of phase composition and defect structure to the long term stability of Li/MgO catalysts
  12. First and second differentials of the ultrasonic parameter as an effective tool to identify phase transitions in R1-xAxMnO3 perovskites
  13. Surface oxide layer formation on Au-Pt-Pd-Si alloys for dental resin restorations
  14. On the high temperature stability of γ-Al2O3/Ti0.33Al0.67N coated WC–Co cutting inserts
  15. Optimizing composition for (Nd, Pr)–Nb–Fe–B hard magnetic nanocomposites
  16. Simple ionic-liquid assisted method for preparation of Cd1-xZnxS nanoparticles with improved photocatalytic activity
  17. A low-cost route for synthesizing tungsten disulfide film composites from abundant sprayed oxides: Technique and characterization
  18. Anodic behavior of Al–Zn–In sacrificial anodes at different concentration of zinc and indium
  19. Short Communications
  20. Effect of molybdenum addition on fracture toughness and hardness of Fe2B in Fe–B–C cast alloy
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  22. DGM News
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