Abstract
An Aurivillius phase, Bi2SrTa2O9, which consists of perovskite-like slabs and bismuth oxide sheets, was treated with 3 M hydrochloric acid for 72 h, and the resultant product was characterized. Scanning electron microscopy investigation indicated that no morphological change occurred during the acid treatment. X-ray diffraction (XRD) analysis revealed that the product exhibited tetragonal symmetry with a = 0.39l ± 0.004 nm and c = 0.98 ± 0.01 nm, and the a parameter is consistent with a typical value for cubic perovskite oxides. High-resolution electron microscopy (HREM) observations along both [001] and [010] showed that the structure of the perovskite-like slabs in Bi2SrTa2O9 was retained after the acid treatment. The compositional analyses revealed the loss of a large portion of bismuth and a part of strontium (present in the bismuth oxide sheets due to B ↔ Sr disorder) and the introduction of protons. These observations indicate that the bismuth oxide sheets in Bi2SrTa2O9 were selectively leached and that protons were introduced into the interlayer space to form a protonated layered perovskite, H1.8[Sr0.8Bi0.2Ta2O7]. Though diffraction techniques (XRD and electron diffraction) demonstrated that an average structure of H1.8[Sr0.8Bi0.2Ta2O7] consisted of perovskite-like slabs stacked without displacement, HREM observation along [010] demonstrated that both a simple stacking sequence without displacement (P-type) and a stacking sequence with a relative displacement by (a + b)/2 (I-type) were present in H1.8[Sr0.8Bi0.2Ta2O7].
| Original language | English |
|---|---|
| Pages (from-to) | 5768-5771 |
| Number of pages | 4 |
| Journal | Inorganic Chemistry |
| Volume | 40 |
| Issue number | 23 |
| DOIs | |
| Publication status | Published - 2001 Nov 5 |
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Preparation and HREM characterization of a protonated form of a layered perovskite tantalate from an aurivillius phase Bi2SrTa2O9 via acid treatment. / Tsunoda, Y.; Shirata, M.; Sugimoto, W.; Liu, Z.; Terasaki, O.; Kuroda, Kazuyuki; Sugahara, Yoshiyuki.
In: Inorganic Chemistry, Vol. 40, No. 23, 05.11.2001, p. 5768-5771.Research output: Contribution to journal › Article
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TY - JOUR
T1 - Preparation and HREM characterization of a protonated form of a layered perovskite tantalate from an aurivillius phase Bi2SrTa2O9 via acid treatment
AU - Tsunoda, Y.
AU - Shirata, M.
AU - Sugimoto, W.
AU - Liu, Z.
AU - Terasaki, O.
AU - Kuroda, Kazuyuki
AU - Sugahara, Yoshiyuki
PY - 2001/11/5
Y1 - 2001/11/5
N2 - An Aurivillius phase, Bi2SrTa2O9, which consists of perovskite-like slabs and bismuth oxide sheets, was treated with 3 M hydrochloric acid for 72 h, and the resultant product was characterized. Scanning electron microscopy investigation indicated that no morphological change occurred during the acid treatment. X-ray diffraction (XRD) analysis revealed that the product exhibited tetragonal symmetry with a = 0.39l ± 0.004 nm and c = 0.98 ± 0.01 nm, and the a parameter is consistent with a typical value for cubic perovskite oxides. High-resolution electron microscopy (HREM) observations along both [001] and [010] showed that the structure of the perovskite-like slabs in Bi2SrTa2O9 was retained after the acid treatment. The compositional analyses revealed the loss of a large portion of bismuth and a part of strontium (present in the bismuth oxide sheets due to B ↔ Sr disorder) and the introduction of protons. These observations indicate that the bismuth oxide sheets in Bi2SrTa2O9 were selectively leached and that protons were introduced into the interlayer space to form a protonated layered perovskite, H1.8[Sr0.8Bi0.2Ta2O7]. Though diffraction techniques (XRD and electron diffraction) demonstrated that an average structure of H1.8[Sr0.8Bi0.2Ta2O7] consisted of perovskite-like slabs stacked without displacement, HREM observation along [010] demonstrated that both a simple stacking sequence without displacement (P-type) and a stacking sequence with a relative displacement by (a + b)/2 (I-type) were present in H1.8[Sr0.8Bi0.2Ta2O7].
AB - An Aurivillius phase, Bi2SrTa2O9, which consists of perovskite-like slabs and bismuth oxide sheets, was treated with 3 M hydrochloric acid for 72 h, and the resultant product was characterized. Scanning electron microscopy investigation indicated that no morphological change occurred during the acid treatment. X-ray diffraction (XRD) analysis revealed that the product exhibited tetragonal symmetry with a = 0.39l ± 0.004 nm and c = 0.98 ± 0.01 nm, and the a parameter is consistent with a typical value for cubic perovskite oxides. High-resolution electron microscopy (HREM) observations along both [001] and [010] showed that the structure of the perovskite-like slabs in Bi2SrTa2O9 was retained after the acid treatment. The compositional analyses revealed the loss of a large portion of bismuth and a part of strontium (present in the bismuth oxide sheets due to B ↔ Sr disorder) and the introduction of protons. These observations indicate that the bismuth oxide sheets in Bi2SrTa2O9 were selectively leached and that protons were introduced into the interlayer space to form a protonated layered perovskite, H1.8[Sr0.8Bi0.2Ta2O7]. Though diffraction techniques (XRD and electron diffraction) demonstrated that an average structure of H1.8[Sr0.8Bi0.2Ta2O7] consisted of perovskite-like slabs stacked without displacement, HREM observation along [010] demonstrated that both a simple stacking sequence without displacement (P-type) and a stacking sequence with a relative displacement by (a + b)/2 (I-type) were present in H1.8[Sr0.8Bi0.2Ta2O7].
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U2 - 10.1021/ic010266m
DO - 10.1021/ic010266m
M3 - Article
VL - 40
SP - 5768
EP - 5771
JO - Inorganic Chemistry
JF - Inorganic Chemistry
SN - 0020-1669
IS - 23
ER -