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Title: Thermal expansion of lanthanum silicate oxyapatite (La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x}), lanthanum oxyorthosilicate (La{sub 2}SiO{sub 5}) and lanthanum sorosilicate (La{sub 2}Si{sub 2}O{sub 7})

Abstract

Four types of powder specimens of La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2} (space group P6{sub 3}/m and Z=1), La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} with 0.06{<=}x{<=}0.13 (P6{sub 3}/m and Z=1), La{sub 2}SiO{sub 5} (P2{sub 1}/c and Z=4) and La{sub 2}Si{sub 2}O{sub 7} (P2{sub 1}/c and Z=4) were examined by high-temperature X-ray powder diffractometry to determine the changes in unit-cell dimensions up to 1473 K. The anisotropy of thermal expansion was demonstrated for the former two crystals to clarify the thermal behaviors of the highly c-axis-oriented polycrystals. With La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2}, the linear expansion coefficient of the a-axis ({alpha}{sub a}) was 4.8 Multiplication-Sign 10{sup -6} K{sup -1} and that of the c-axis ({alpha}{sub c}) was 1.8 Multiplication-Sign 10{sup -6} K{sup -1} in the temperature range from 298 to 1473 K. The {alpha}{sub a}- and {alpha}{sub c}-values of La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (0.06{<=}x{<=}0.13) were, respectively, 5.9 Multiplication-Sign 10{sup -6} K{sup -1} and 2.3 Multiplication-Sign 10{sup -6} K{sup -1}. The coefficients of mean linear thermal expansion were 4.9 Multiplication-Sign 10{sup -6} K{sup -1} for La{sub 2}SiO{sub 5} and 6.0 Multiplication-Sign 10{sup -6} K{sup -1} for La{sub 2}Si{sub 2}O{sub 7}, which describe the thermal expansion behaviors of the randomly grain-oriented polycrystalline materials. -more » Graphical abstarct: Temperature dependence of the coefficients of thermal expansion (CTE). The linear CTE along the a-axes for La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2} and La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} with 0.06{<=}x{<=}0.13. The mean linear CTE for La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7}. Highlights: Black-Right-Pointing-Pointer We examined the thermal expansion of La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (x=0 and 0.06{<=}x{<=}0.13), La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7} Black-Right-Pointing-Pointer Unit-cell dimensions were determined up to 1473 K by high-temperature X-ray diffraction Black-Right-Pointing-Pointer Anisotropic expansion was clarified for La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (x=0 and 0.06{<=}x{<=}0.13) Black-Right-Pointing-Pointer Mean linear thermal expansion was determined for La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7.}.« less

Authors:
 [1]; ;  [1]
  1. Department of Environmental and Materials Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
Publication Date:
OSTI Identifier:
22149842
Resource Type:
Journal Article
Journal Name:
Journal of Solid State Chemistry
Additional Journal Information:
Journal Volume: 194; Other Information: Copyright (c) 2012 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0022-4596
Country of Publication:
United States
Language:
English
Subject:
37 INORGANIC, ORGANIC, PHYSICAL AND ANALYTICAL CHEMISTRY; ANISOTROPY; HEXAGONAL LATTICES; LANTHANUM; LANTHANUM SILICATES; LATTICE PARAMETERS; MONOCLINIC LATTICES; POLYCRYSTALS; POWDERS; SILICON OXIDES; SPACE GROUPS; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0400-1000 K; THERMAL EXPANSION; X-RAY DIFFRACTION

Citation Formats

Fukuda, Koichiro, Asaka, Toru, and Uchida, Tomohiro. Thermal expansion of lanthanum silicate oxyapatite (La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x}), lanthanum oxyorthosilicate (La{sub 2}SiO{sub 5}) and lanthanum sorosilicate (La{sub 2}Si{sub 2}O{sub 7}). United States: N. p., 2012. Web. doi:10.1016/J.JSSC.2012.04.043.
Fukuda, Koichiro, Asaka, Toru, & Uchida, Tomohiro. Thermal expansion of lanthanum silicate oxyapatite (La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x}), lanthanum oxyorthosilicate (La{sub 2}SiO{sub 5}) and lanthanum sorosilicate (La{sub 2}Si{sub 2}O{sub 7}). United States. doi:10.1016/J.JSSC.2012.04.043.
Fukuda, Koichiro, Asaka, Toru, and Uchida, Tomohiro. Mon . "Thermal expansion of lanthanum silicate oxyapatite (La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x}), lanthanum oxyorthosilicate (La{sub 2}SiO{sub 5}) and lanthanum sorosilicate (La{sub 2}Si{sub 2}O{sub 7})". United States. doi:10.1016/J.JSSC.2012.04.043.
@article{osti_22149842,
title = {Thermal expansion of lanthanum silicate oxyapatite (La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x}), lanthanum oxyorthosilicate (La{sub 2}SiO{sub 5}) and lanthanum sorosilicate (La{sub 2}Si{sub 2}O{sub 7})},
author = {Fukuda, Koichiro and Asaka, Toru and Uchida, Tomohiro},
abstractNote = {Four types of powder specimens of La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2} (space group P6{sub 3}/m and Z=1), La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} with 0.06{<=}x{<=}0.13 (P6{sub 3}/m and Z=1), La{sub 2}SiO{sub 5} (P2{sub 1}/c and Z=4) and La{sub 2}Si{sub 2}O{sub 7} (P2{sub 1}/c and Z=4) were examined by high-temperature X-ray powder diffractometry to determine the changes in unit-cell dimensions up to 1473 K. The anisotropy of thermal expansion was demonstrated for the former two crystals to clarify the thermal behaviors of the highly c-axis-oriented polycrystals. With La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2}, the linear expansion coefficient of the a-axis ({alpha}{sub a}) was 4.8 Multiplication-Sign 10{sup -6} K{sup -1} and that of the c-axis ({alpha}{sub c}) was 1.8 Multiplication-Sign 10{sup -6} K{sup -1} in the temperature range from 298 to 1473 K. The {alpha}{sub a}- and {alpha}{sub c}-values of La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (0.06{<=}x{<=}0.13) were, respectively, 5.9 Multiplication-Sign 10{sup -6} K{sup -1} and 2.3 Multiplication-Sign 10{sup -6} K{sup -1}. The coefficients of mean linear thermal expansion were 4.9 Multiplication-Sign 10{sup -6} K{sup -1} for La{sub 2}SiO{sub 5} and 6.0 Multiplication-Sign 10{sup -6} K{sup -1} for La{sub 2}Si{sub 2}O{sub 7}, which describe the thermal expansion behaviors of the randomly grain-oriented polycrystalline materials. - Graphical abstarct: Temperature dependence of the coefficients of thermal expansion (CTE). The linear CTE along the a-axes for La{sub 9.33}(SiO{sub 4}){sub 6}O{sub 2} and La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} with 0.06{<=}x{<=}0.13. The mean linear CTE for La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7}. Highlights: Black-Right-Pointing-Pointer We examined the thermal expansion of La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (x=0 and 0.06{<=}x{<=}0.13), La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7} Black-Right-Pointing-Pointer Unit-cell dimensions were determined up to 1473 K by high-temperature X-ray diffraction Black-Right-Pointing-Pointer Anisotropic expansion was clarified for La{sub 9.33+2x}(SiO{sub 4}){sub 6}O{sub 2+3x} (x=0 and 0.06{<=}x{<=}0.13) Black-Right-Pointing-Pointer Mean linear thermal expansion was determined for La{sub 2}SiO{sub 5} and La{sub 2}Si{sub 2}O{sub 7.}.},
doi = {10.1016/J.JSSC.2012.04.043},
journal = {Journal of Solid State Chemistry},
issn = {0022-4596},
number = ,
volume = 194,
place = {United States},
year = {2012},
month = {10}
}