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Effects of anisotropic strain on perovskite LaMnO3+δ nanoparticles embedded in mesoporous silica
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View: Figures


Image of FIG. 1.
FIG. 1.

(Color online) Schematics of nanoparticles synthesized in one-dimensional pores of SBA-15 at ambient pressure (a) and under high pressure (b). Arrows show the direction of the stress. The arrows outside SBA-15 show the direction of the hydrostatic pressure applied to SBA-15 containing the nanoparticles. The nanoparticles are subjected to anisotropic stress by the silica walls of SBA-15, as shown by the arrows in contact with the nanoparticles.

Image of FIG. 2.
FIG. 2.

(Color online) Background-subtracted powder XRD patterns of LMO nanoparticles in SBA-15 under high pressure at room temperature. The incident X-ray wavelength was 1.0329 Å. The part of the XRD patterns under high pressure were removed because of the presence of spike noise. The simulated pattern corresponds to the crystal structure with a rhombohedral symmetry.

Image of FIG. 3.
FIG. 3.

Pressure dependence of lattice constants, a and c, of LMO nanoparticles in SBA-15.

Image of FIG. 4.
FIG. 4.

(Color online) Pressure dependence of lattice strain in LMO nanoparticles in SBA-15. The values were estimated from the slope of the straight line in the Williamson-Hall plot, as shown in the inset.

Image of FIG. 5.
FIG. 5.

(Color online) (a) Temperature dependence of in-phase χ’ of ac susceptibility for LMO nanoparticles in SBA-15 under various pressures. (b) Pressure dependence of T C and T N for LMO nanoparticles. Inset shows the temperature dependence of the derivative dχ’/dT at ambient pressure, and the two arrows show T C and T N.


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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Effects of anisotropic strain on perovskite LaMnO3+δ nanoparticles embedded in mesoporous silica