TY - JOUR
T1 - Mössbauer studies on particle volume distribution of α-FeOOH in rust formed on weathering steel
AU - Okada, Takuya
AU - Ishii, Yasuyuki
AU - Mizoguchi, Tadashi
AU - Tamura, Ichiro
AU - Kobayashi, Yoshio
AU - Takagi, Yasuo
AU - Suzuki, Shigeru
AU - Kihira, Hiroshi
AU - Itou, Minoru
AU - Usami, Akira
AU - Tanabe, Kouji
AU - Masuda, Kazuhiro
PY - 2000
Y1 - 2000
N2 - Rust formed on weathering steel and that on mild steel were studied by Mössbauer spectroscopy at various temperatures from room temperature to 12 K. The observed spectra were decomposed into the contribution of fine antiferromagnetic particles of α-FeOOH (85 at.%, TN = 403 K) and that of γ-FeOOH (15 at.%, TN = 73 K). Volume distributions of α-FeOOH particles obtained by analyzing the superparamagnetic relaxation effect on Mössbauer spectra show the following distinct characteristics: While 83 vol% of α-FeOOH particles in the rust on mild steel are larger than 7.5 × 10-24 m3 and the rest of them (17 vol%) are smaller than 3.0 × 10-24 m3, the rust on weathering steel shows a continuous and wide volume distribution down to the ultrafine particle region (smaller than 3.0 × 10-24 m3) without a missing region, and 53 vol% of particles are smaller than 7.5 × 10-24 m3. It is understood that this continuous volume distribution of α-FeOOH particles in the rust on weathering steel is favorable for accommodating a closely packed structure in the protective rust layer on weathering steel.
AB - Rust formed on weathering steel and that on mild steel were studied by Mössbauer spectroscopy at various temperatures from room temperature to 12 K. The observed spectra were decomposed into the contribution of fine antiferromagnetic particles of α-FeOOH (85 at.%, TN = 403 K) and that of γ-FeOOH (15 at.%, TN = 73 K). Volume distributions of α-FeOOH particles obtained by analyzing the superparamagnetic relaxation effect on Mössbauer spectra show the following distinct characteristics: While 83 vol% of α-FeOOH particles in the rust on mild steel are larger than 7.5 × 10-24 m3 and the rest of them (17 vol%) are smaller than 3.0 × 10-24 m3, the rust on weathering steel shows a continuous and wide volume distribution down to the ultrafine particle region (smaller than 3.0 × 10-24 m3) without a missing region, and 53 vol% of particles are smaller than 7.5 × 10-24 m3. It is understood that this continuous volume distribution of α-FeOOH particles in the rust on weathering steel is favorable for accommodating a closely packed structure in the protective rust layer on weathering steel.
KW - Collective excitation
KW - Mössbauer spectroscopy
KW - Particle volume distribution
KW - Rust
KW - Superparamagnetic relaxation
KW - Weathering steel
KW - α-FeOOH
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U2 - 10.1143/jjap.39.3382
DO - 10.1143/jjap.39.3382
M3 - Article
AN - SCOPUS:0034204908
VL - 39
SP - 3382
EP - 3391
JO - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
JF - Japanese Journal of Applied Physics, Part 1: Regular Papers & Short Notes
SN - 0021-4922
IS - 6 A
ER -