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Journal of Advanced Ceramics 2013, 2(4): 301-307 https://doi.org/10.1007/s40145-013-0074-9
Research Article | Open Access | Issue | Published: 04 December 2013

Synthesis of bulk lanthanum polyphosphate and other rare earth phosphates through hydrothermal hot-pressing

Show Author's Information Hiroaki ONODA*( ),  Taro YAMASAKI
Department of Informatics and Environmental Sciences, Faculty of Life and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cho, Sakyo-ku, Kyoto 606-8522, Japan
Keywords:
lanthanum polyphosphate, hydrothermal hot-pressing (HHP) process, machinable strength, vibration strength, microwave heating
Cite this article:
ONODA H, YAMASAKI T. Synthesis of bulk lanthanum polyphosphate and other rare earth phosphates through hydrothermal hot-pressing. Journal of Advanced Ceramics, 2013, 2(4): 301-307. https://doi.org/10.1007/s40145-013-0074-9
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Abstract Full text About this article

Bulk samples of lanthanum polyphosphate were synthesized through a hydrothermal hot-pressing (HHP) process. In this process, pressing temperature, pressure and volume of water were varied in order to improve the density and strength of the resulting materials. The strength of the bulk samples was estimated through drilling and ultrasonic treatments. In order to improve the strength of the materials, the use of microwave irradiation was examined. Lanthanum polyphosphate formed porous bulk samples with a filling factor of approximately 70%, which was calculated from real and theoretical densities. With respect to machinable strength, a drilled hole greater than 7.0 mm in diameter was obtained on some bulk samples, and the diameter of the samples was 14 mm. The HHP process is a useful method for obtaining bulk samples of lanthanum polyphosphate. Bulk lanthanum polyphosphate containing water crumbled easily to a powder form upon ultrasonication. However, these bulk samples retained their shape upon ultrasonication, despite containing water, after exposure to microwave irradiation, and also experienced minimal weight loss. Furthermore, to study the effect of microwave heating, bulk lanthanum orthophosphate, yttrium orthophosphate and polyphosphate were also examined.


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About this article

Synthesis of bulk lanthanum polyphosphate and other rare earth phosphates through hydrothermal hot-pressing

Show Author's information Hiroaki ONODA*( ), Taro YAMASAKI
Department of Informatics and Environmental Sciences, Faculty of Life and Environmental Sciences, Kyoto Prefectural University, 1-5, Shimogamo Nakaragi-cho, Sakyo-ku, Kyoto 606-8522, Japan

Abstract

Bulk samples of lanthanum polyphosphate were synthesized through a hydrothermal hot-pressing (HHP) process. In this process, pressing temperature, pressure and volume of water were varied in order to improve the density and strength of the resulting materials. The strength of the bulk samples was estimated through drilling and ultrasonic treatments. In order to improve the strength of the materials, the use of microwave irradiation was examined. Lanthanum polyphosphate formed porous bulk samples with a filling factor of approximately 70%, which was calculated from real and theoretical densities. With respect to machinable strength, a drilled hole greater than 7.0 mm in diameter was obtained on some bulk samples, and the diameter of the samples was 14 mm. The HHP process is a useful method for obtaining bulk samples of lanthanum polyphosphate. Bulk lanthanum polyphosphate containing water crumbled easily to a powder form upon ultrasonication. However, these bulk samples retained their shape upon ultrasonication, despite containing water, after exposure to microwave irradiation, and also experienced minimal weight loss. Furthermore, to study the effect of microwave heating, bulk lanthanum orthophosphate, yttrium orthophosphate and polyphosphate were also examined.

Keywords: lanthanum polyphosphate, hydrothermal hot-pressing (HHP) process, machinable strength, vibration strength, microwave heating

References(12)

[1]
Onoda H, Tange K, Tanaka I. Influence of lanthanum addition on preparation and powder properties of cobalt phosphates. J Mater Sci 2008, 43: 5483-5488.
DOI Google Scholar
[2]
Takimura M, Nagata H, Yamasaki Y, et al. Synthesis and characterization of bulky FSM with interconnected mesopore-networks using an HHP method. J Ceram Soc Jpn 2006, 114: 554-557.
DOI Google Scholar
[3]
Nakahira A, Takimura M, Yamasaki Y. Synthesis of bulky mesoporous silica (FSM) by hydrothermal hot-pressing method. J Non-Cryst Solids 2007, 353: 4203-4207.
DOI Google Scholar
[4]
Matamoros-Veloza Z, Yanagisawa K, Rendón-Angeles JC, et al. Preparation of porous glass-ceramics under different hydrothermal hot pressing conditions. Solid State Ionics 2004, 172: 597-600.
DOI Google Scholar
[5]
Onoki T, Hosoi K, Hashida T. New technique for bonding hydroxyapatite ceramics and titanium by the hydrothermal hot-pressing method. Scripta Mater 2005, 52: 767-770.
DOI Google Scholar
[6]
Katsuyama S, Kishida A, Ito M. Synthesis of NaxCo2O4 by the hydrothermal hot-pressing and its thermoelectric properties. J Alloys Compd 2006, 414: 215-220.
DOI Google Scholar
[7]
Onoki T, Hosoi K, Hashida T, et al. Effects of titanium surface modifications on bonding behavior of hydroxyapatite ceramics and titanium by hydrothermal hot-pressing. Mat Sci Eng C 2008, 28: 207-212.
DOI Google Scholar
[8]
Onoda H, Okumoto K, Nakahira A, et al. Mechanochemical effects on the synthesis of copper orthophosphate and cyclo-tetraphosphate bulks by the hydrothermal hot pressing method. Materials 2009, 2: 1-9.
DOI Google Scholar
[9]
Onoda H, Sakai R, Nakahira A, et al. Synthesis of porous aluminum phosphate bulks by hydrothermal hot pressing process and their analytical characterizations. Inorg Mater 2009, 45: 1048-1052.
DOI Google Scholar
[10]
Onoda H, Inagaki Y, Kuwabara A, et al. Synthesis and electrical conductivity of tetra-valent cerium polyphosphate bulks. Phosphorus Res Bull 2009, 23: 20-24.
DOI Google Scholar
[11]
Min W, Miyahara D, Yokoi K, et al. Thermal and mechanical properties of sintered LaPO4–Al2O3 composites. Mater Res Bull 2001, 36: 939-945.
DOI Google Scholar
[12]
Onoda H, Yoshida A. The synthesis and properties of bulk lanthanum phosphates obtained by hydrothermal hot pressing. J Ceram Process Res 2012, 13: 622-626.
Google Scholar
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Publication history

Received: 01 April 2013
Revised: 10 July 2013
Accepted: 11 July 2013
Published: 04 December 2013
Issue date: December 2013

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© The author(s) 2013

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Open Access: This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution, and reproduction in any medium, provided the original author(s) and the source are credited.

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