Structure and electromagnetic properties of La0.7Ca0.3-xKxMnO3 polycrystalline ceramics
Source abstract
Abstract
Abstract In this study, La0.7Ca0.3-xKxMnO3 (LCKMO) polycrystalline ceramics were synthesized by sol–gel method. Their structures, surface morphologies, and electromagnetic transmission characteristics were studied and discussed. X-ray diffraction results showed that all prepared specimens highly crystalized as single phase with orthorhombic perovskite structure and Pnma space group. Characterization by scanning electron microscopy revealed that grain size increased with the increase in the K+ content. Electrical resistivity as function of temperature (ρ-T) was investigated through standard four-probe method. With the increase in the K+ content, metal–insulator transition temperature (Tp) and the Curie temperature (TC) shifted to higher temperatures, while the resistivity (ρ) reduced. Careful analysis of data indicated that peak temperature coefficient of resistance (TCR) and magnetoresistance (MR) were affected by K+ substitution. At x = 0.02, peak TCR and MR values reached 6.03%·K−1 and 30.26%, respectively. Characteristics of resultant ceramics were explained based on double exchange interaction. Overall, LCKMO materials act as promising candidates for broad range of applications in magnetic devices and infrared detectors at room temperature.
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Research context
OpenAlex topics: Magnetic and transport properties of perovskites and related materials · Multiferroics and related materials · Advanced Condensed Matter Physics
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
References (38)
Show source-provided references
1. Colossal magnetoresistive manganites10.1016/S0304-8853(99)00352-2 ↗
2. Colossal magnetoresistance in Ln1-xAxMnO3 perovskites10.1071/P98070 ↗
3. CMR manganites: physics, thin films and devices10.1088/0022-3727/36/8/201 ↗
4. Electronic structure of CMR manganites (invited)10.1063/1.364536 ↗
5. Modelling colossal magnetoresistance manganites10.1088/0953-8984/19/12/125211 ↗
6. Search for room temperature high-TCR manganite/silver composites10.1016/j.jmmm.2008.01.039 ↗
7. Three models of magnetic ordering in typical magnetic materials10.1016/j.physrep.2018.06.009 ↗
8. Spin-dependent and spin-independent channels of electrical transport in perovskite manganites10.1039/C7RA12878A ↗
9. Study of magnetic structure and electrical-transport properties of La1-yBayMn1-xFexO3 (y = 0.15, 0.40) perovskite manganites10.1016/j.jallcom.2018.06.057 ↗
10. Studies on low-field and room-temperature magnetoresistance in La2/3(Ca1-xSrx)1/3MnO3 perovskites10.1007/s10948-012-1798-4 ↗
11. Structural, magnetic and magnetotransport behavior of La0.7SrxCa0.3−xMnO3 compounds10.1016/j.physb.2011.10.006 ↗
12. Interaction between thedShells in the transition metals10.1103/PhysRev.81.440 ↗
13. Influence of Sm-doping on the structural, magnetic, and electrical properties of La0.8−xSmxSr0.2 MnO3 (0 < x < 0.45) manganites10.1016/j.jallcom.2013.06.067 ↗
14. Influence of grain boundaries on resistivity of manganites La1-xKxMnO310.1134/S1063783412030110 ↗
15. Structural, electrical, and magnetic properties of high-temperature-sintered La1-xNaxMnO3 (0.05 < x < 0.35) compounds10.1007/s11664-014-3514-6 ↗
16. Relationship between the magnetoresistance and the magnetocaloric effect in La1-xAgxMnO3 manganites10.1134/S1063783412010118 ↗
17. Anomalous thermopower in bismuth doped La–Li–Mn–O manganite10.1016/j.physleta.2014.10.040 ↗
18. Conductivity and magnetoresistance of La1−xSrxMnO3 and La1−xSrxMn1−yMgyO3 single crystals10.1016/S0304-8853(96)00562-8 ↗
19. Grain morphology and size disorder effect on the transport and magnetotransport in Sol–Gel grown nanostructured manganites10.1016/j.apsusc.2012.05.149 ↗
20. Structure, magnetic and electrical transport properties of the perovskites La0.67−xEuxSr0.33MnO310.1016/j.jmmm.2012.08.024 ↗
21. A comparative study of La0.65Ca0.2 (Na0.5K0.5)0.15MnO3 compound synthesized by solid-state and sol-gel process10.1016/j.jallcom.2016.11.166 ↗
22. Structure, electrical and magnetic properties of La0.67Ca0.33−xKxMnO3 polycrystalline ceramic10.1007/s10854-017-8089-6 ↗
23. Enhancement of temperature coefficient of resistivity in La0.67Ca0.33MnO3 polycrystalline ceramics10.1016/j.ceramint.2013.10.105 ↗
24. Improvement in electronic and magnetic transport of La0.67Ca0.33MnO3 manganites by optimizing sintering temperature
25. Enhanced room-temperature MR and TCR in polycrystalline La0.67(Ca0.33−xSrx)MnO3 ceramics by oxygen assisted sintering10.1016/j.ceramint.2017.10.209 ↗
26. Improvement of room-temperature TCR and MR in polycrystalline La0.67(Ca0.27Sr0.06)MnO3 ceramics by Ag2O doping10.1016/j.ceramint.2018.02.234 ↗
27. Transport properties of La0.6Y0.1Ca0.3MnO3 compounds with different interfaces10.1016/S0955-2219(03)00446-1 ↗
28. Preparation of La0.67Ca0.33MnO3:Agx polycrystalline by sol–gel method10.1007/s10971-014-3290-z ↗
29. Tuning room temperature Tp and MR of La1-y(Cay-xSrx)MnO3 polycrystalline ceramics by Sr doping10.1016/j.ceramint.2016.12.121 ↗
30. Temperature-dependent infrared properties of Ca doped (La,Sr)MnO3 compositions with potential thermal control application10.1016/j.applthermaleng.2012.07.046 ↗
31. Synthesis and low field transport properties in a ZnO-doped La0.67Ca0.33MnO3 composite10.1016/j.mseb.2005.11.023 ↗
32. Effect of bismuth doping on the physical properties of La–Li–Mn–O manganite
33. Colossal magnetoresistance of ferromagnetic manganites: structural tuning and mechanisms10.1103/PhysRevLett.76.1122 ↗
34. Structure, magnetic and transport properties of La0.7Ca0.3-xSrxMnO3 thin films by sol-gel method10.1016/j.ceramint.2015.03.291 ↗
35. Electrical conductivity and low field magnetoresistance in polycrystalline La1−xKxMnO3 pellets prepared by pyrophoric method10.1016/j.ssc.2005.01.023 ↗
36. Influence of A-site cation mismatch on structural, magnetic and electrical properties of lanthanum manganites10.1016/j.jallcom.2006.03.081 ↗
37. Investigation on structural, magneto-transport, magnetic and thermal properties of La0.8Ca0.2-xBaxMnO3 (0≤x≤0.2) manganites10.1016/j.jallcom.2015.03.231 ↗
38. Structural properties, magnetic interactions, magnetocaloric effect and critical behaviour of cobalt doped La0.7Te0.3MnO310.1039/C5RA13408K ↗