TY - JOUR
T1 - High-resolution electron microscopy for incommensurate structure of KxRhO2 crystal
AU - Yubuta, Kunio
AU - Shibasaki, Soichiro
AU - Terasaki, Ichiro
AU - Kajitani, Tsuyoshi
PY - 2009/11/1
Y1 - 2009/11/1
N2 - An incommensurate, (3 + 2)-dimensional structure is locally observed in a K0.49RhO2 crystal synthesized by the flux growth method. The averaged potassium to rhodium ratio of the grown crystals was determined as 0.49 using an electron probe microanalyzer operated in the wave dispersive spectroscopy mode. The potassium content of the incommensurate phase was determined as 0.25 by the transmission electron microscopy-energy dispersive spectroscopy method. Satellite reflections of an incommensurate phase having two modulation vectors, q*1=0.15a*0+0. 21b*0 and q*2-0.21a*0+0. 36b*0 (ao is the unit cell for λ-Na xCoO2-type structure), are indexed successfully. High-resolution electron microscopy (HREM) images show dark streaks running parallel in the a-b plane. The separations and directions of the dark streaks have a close relationship between the q-vector of satellite spots. A HREM image taken with the electron beam parallel to [100] direction shows planer clusters between CdI2-type RhO2 layers. These clusters correspond to the intercalated potassium ions.
AB - An incommensurate, (3 + 2)-dimensional structure is locally observed in a K0.49RhO2 crystal synthesized by the flux growth method. The averaged potassium to rhodium ratio of the grown crystals was determined as 0.49 using an electron probe microanalyzer operated in the wave dispersive spectroscopy mode. The potassium content of the incommensurate phase was determined as 0.25 by the transmission electron microscopy-energy dispersive spectroscopy method. Satellite reflections of an incommensurate phase having two modulation vectors, q*1=0.15a*0+0. 21b*0 and q*2-0.21a*0+0. 36b*0 (ao is the unit cell for λ-Na xCoO2-type structure), are indexed successfully. High-resolution electron microscopy (HREM) images show dark streaks running parallel in the a-b plane. The separations and directions of the dark streaks have a close relationship between the q-vector of satellite spots. A HREM image taken with the electron beam parallel to [100] direction shows planer clusters between CdI2-type RhO2 layers. These clusters correspond to the intercalated potassium ions.
KW - Electron diffraction
KW - High-resolution transmission electron microscopy
KW - Incommensurate phase
KW - Layered oxide
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U2 - 10.1080/14786430903092401
DO - 10.1080/14786430903092401
M3 - Article
AN - SCOPUS:74949104001
VL - 89
SP - 2813
EP - 2822
JO - Philosophical Magazine
JF - Philosophical Magazine
SN - 1478-6435
IS - 31
ER -