Abstract
Low-temperature formation routes of lanthanum silicate and neodymium silicate oxyapatites were analyzed by a combination of powder X-ray diffraction and thermogravimetric/differential thermal analysis by using precursors prepared from the water-based sol-gel method. Oxyapatite phase was found to form at about 1073 K in the case of lanthanum silicate and at about 1273 K in the case of neodymium silicate - temperatures much lower than those for a conventional solid-state reaction method. In each system, the oxyapatite phase was formed after decomposition of the lanthanoid oxycarbonate or metastable lanthanoid oxide. In particular, decomposition of lanthanum oxycarbonate was found to play an important role in lanthanum silicate oxyapatite formation. In addition to proposing a crystal structure for the lanthanoid oxycarbonate, we hypothesize an in-situ chemical pulverization process due to the delamination of lanthanoid oxide by carbon dioxide dissociation.
| Original language | English |
|---|---|
| Pages (from-to) | 91-96 |
| Number of pages | 6 |
| Journal | Solid State Ionics |
| Volume | 204-205 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2011 Nov 2 |
| Externally published | Yes |
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Keywords
- Chemical pulverization
- Lanthanum silicate
- Low-temperature synthesis
- Neodymium silicate
- Oxyapatite
- Sol-gel
ASJC Scopus subject areas
- Chemistry(all)
- Materials Science(all)
- Condensed Matter Physics
Cite this
Low-temperature formation of Ln silicate oxyapatite (Ln = la and Nd) by the water-based sol-gel method. / Kobayashi, Kiyoshi; Suzuki, Tohru; Uchikoshi, Tetsuo; Sakka, Yoshio.
In: Solid State Ionics, Vol. 204-205, No. 1, 02.11.2011, p. 91-96.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Low-temperature formation of Ln silicate oxyapatite (Ln = la and Nd) by the water-based sol-gel method
AU - Kobayashi, Kiyoshi
AU - Suzuki, Tohru
AU - Uchikoshi, Tetsuo
AU - Sakka, Yoshio
PY - 2011/11/2
Y1 - 2011/11/2
N2 - Low-temperature formation routes of lanthanum silicate and neodymium silicate oxyapatites were analyzed by a combination of powder X-ray diffraction and thermogravimetric/differential thermal analysis by using precursors prepared from the water-based sol-gel method. Oxyapatite phase was found to form at about 1073 K in the case of lanthanum silicate and at about 1273 K in the case of neodymium silicate - temperatures much lower than those for a conventional solid-state reaction method. In each system, the oxyapatite phase was formed after decomposition of the lanthanoid oxycarbonate or metastable lanthanoid oxide. In particular, decomposition of lanthanum oxycarbonate was found to play an important role in lanthanum silicate oxyapatite formation. In addition to proposing a crystal structure for the lanthanoid oxycarbonate, we hypothesize an in-situ chemical pulverization process due to the delamination of lanthanoid oxide by carbon dioxide dissociation.
AB - Low-temperature formation routes of lanthanum silicate and neodymium silicate oxyapatites were analyzed by a combination of powder X-ray diffraction and thermogravimetric/differential thermal analysis by using precursors prepared from the water-based sol-gel method. Oxyapatite phase was found to form at about 1073 K in the case of lanthanum silicate and at about 1273 K in the case of neodymium silicate - temperatures much lower than those for a conventional solid-state reaction method. In each system, the oxyapatite phase was formed after decomposition of the lanthanoid oxycarbonate or metastable lanthanoid oxide. In particular, decomposition of lanthanum oxycarbonate was found to play an important role in lanthanum silicate oxyapatite formation. In addition to proposing a crystal structure for the lanthanoid oxycarbonate, we hypothesize an in-situ chemical pulverization process due to the delamination of lanthanoid oxide by carbon dioxide dissociation.
KW - Chemical pulverization
KW - Lanthanum silicate
KW - Low-temperature synthesis
KW - Neodymium silicate
KW - Oxyapatite
KW - Sol-gel
UR - http://www.scopus.com/inward/record.url?scp=84855254933&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84855254933&partnerID=8YFLogxK
U2 - 10.1016/j.ssi.2011.10.011
DO - 10.1016/j.ssi.2011.10.011
M3 - Article
AN - SCOPUS:84855254933
VL - 204-205
SP - 91
EP - 96
JO - Solid State Ionics
JF - Solid State Ionics
SN - 0167-2738
IS - 1
ER -