TY - JOUR
T1 - State of two-dimensional long-period superstructure in the metastable Fe-Nd-B phase
AU - Konno, Toyohiko J.
AU - Uehara, Minoru
AU - Hirosawa, Satoshi
N1 - Funding Information:
This work was supported by a Grant-in-Aid for Scientific Research by the Ministry of Education, Culture, Sports, Science and Technology of Japan (Grant number 15074218).
PY - 2006/4/1
Y1 - 2006/4/1
N2 - We investigated using transmission electron microscopy (TEM) the state of a long-period superstructure (LPS) composed of a metastable D 0 3 phase, which emerged during crystallisation of Fe 89 Nd 7 B 4 amorphous alloys [Konno, Uehara, Hirosawa, et al ., Phil. Mag. A 79 2413 (1999)]. Diffraction studies showed that it is a two-dimensional (2D) LPS characterized by 1/4 a 0 antiphase boundaries (APBs) perpendicular to directions and 1/2 a 0 APBs perpendicular to directions, where a 0 is the unit cell parameter of the D 0 3 cell. Dark field images and high-resolution TEM showed that superperiods estimated from diffraction patterns, 3.2 and 2.4 nm, respectively, represent an average structure; and real arrangements of APBs are rather diverse in terms of both periodicity and APB planes. These observations indicate that the 2D LPS emerged in the following reaction sequence: amorphous → A2 → D 03 with 2D LPS → D 03, where all the phases are metastable.
AB - We investigated using transmission electron microscopy (TEM) the state of a long-period superstructure (LPS) composed of a metastable D 0 3 phase, which emerged during crystallisation of Fe 89 Nd 7 B 4 amorphous alloys [Konno, Uehara, Hirosawa, et al ., Phil. Mag. A 79 2413 (1999)]. Diffraction studies showed that it is a two-dimensional (2D) LPS characterized by 1/4 a 0 antiphase boundaries (APBs) perpendicular to directions and 1/2 a 0 APBs perpendicular to directions, where a 0 is the unit cell parameter of the D 0 3 cell. Dark field images and high-resolution TEM showed that superperiods estimated from diffraction patterns, 3.2 and 2.4 nm, respectively, represent an average structure; and real arrangements of APBs are rather diverse in terms of both periodicity and APB planes. These observations indicate that the 2D LPS emerged in the following reaction sequence: amorphous → A2 → D 03 with 2D LPS → D 03, where all the phases are metastable.
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U2 - 10.1080/14786430500380167
DO - 10.1080/14786430500380167
M3 - Article
AN - SCOPUS:33645105195
SN - 1478-6435
VL - 86
SP - 1427
EP - 1441
JO - Philosophical Magazine
JF - Philosophical Magazine
IS - 10
ER -