Corrigendum to “Full X–Ku band microwave absorption by Fe(Mn)/Mn7C3/C core/shell/shell structured nanocapsules” [J. Alloys Compd. 509 (2011) 9071–9075]

An article of this title was published in the Journal of Alloys and Compounds, 509 (2011) 9071–9075. Unfortunately, a computational rror has occurred which causes the results described in part of the abstract, in part of Section 3 of the main text, in Fig. 3, in part of the onclusion, and in references in the published article to be wrong. The corrected abstract, the corrected text in Section 3, the corrected ig. 3, the corrected conclusion, and the corrected references are displayed below: In abstract, the last two sentences should be corrected as “An optimal reflection loss (RL) of −35.5 dB was observed at 12 GHz for 5.0 mm hickness layer. RL exceeding −2.5 dB was obtained at 6.6–18 GHz for 1.4 mm thickness, covering the whole X band (8–12 GHz), Ku band 12–18 GHz), and some of C band (6.6–8.0 GHz). RL exceeding −5 dB was found at 6–10.6 GHz for 2.2 mm thickness.” The last two paragraphs in Section 3 should be corrected as follows: To further examine the microwave absorption abilities of the Fe(Mn)/Mn7C3/C nanocapsules, RL as a function of absorbing thickness d nd frequency f were calculated, as shown in Fig. 3, according to Eq. (1). The optimal RL or the dip in RL corresponds to the occurrence of he maximum absorption or the minimum reflection of the microwave power for the particular thickness [34]. As shown in Fig. 3(a), an ptimal RL of −35.5 dB, corresponding to almost 100% absorption, is observed at 12 GHz for 5.0 mm thickness layer. The intensity and the requency at the reflection loss minimum depend on the properties and thickness of the materials [34]. It is worth noting that the number f dips increases with an increase in sample thickness. It can be seen that there is only one dip for 1–3 mm and the dip shifts to the lower requency side with increasing thickness of the layer, while two complete dips can be observed for 3–5 mm. The occurrence of the dips is ound to be due to a successive odd number multiple of the quarter wavelength ( ) thickness of the material or d = n /4 (n = 1, 3) [34]. The absorbing thickness of 5.0 mm is too thick for the rapid development in electronic industry. From the view point of practical use he upper limit of absorbing thickness should be 3.0 mm. As shown in Fig. 3(b), RL exceeding −2.5 dB is obtained at 6.6–18 GHz for 1.4 mm hickness, covering the whole X band (8–12 GHz), Ku band (12–18 GHz), and some of C band (6.6–8.0 GHz). Also, RL exceeding −5 dB is found t 6–10.6 GHz for 2.2 mm thickness. In addition, an optimal RL reaching −13.5 dB is seen at 7 GHz for 2.6 mm thickness. Bandwidth of RL xceeding −2.5 dB is sufficiently widened in Fe(Mn)/Mn7C3/C due to the ternary dielectric relaxation and the enhanced natural resonance rom the special core/shell/shell microstructure. The conclusion should be corrected as: Fe(Mn)/Mn7C3/C nanocapsules have been synthesized by a modified arc discharge technique, with Fe(Mn) nanoparticles as the core, n7C3 as the inner shell, and C as the outer shell. The nanocapsules have exhibited the excellent microwave absorption properties at