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Preparation of Li2ZrO3 by powder reaction and hydrolysis of metal alkoxides

Identifieur interne : 000E50 ( Istex/Corpus ); précédent : 000E49; suivant : 000E51

Preparation of Li2ZrO3 by powder reaction and hydrolysis of metal alkoxides

Auteurs : C. Alvani ; L. Bruzzi ; S. Casadio ; V. Rondinella ; A. Tucci ; E. H. Toscano

Source :

RBID : ISTEX:C30F4DAA429AFA0B51AB4EA436C21943251B1D13

Abstract

Three methods have been developed to produce high purity, fine grained lithium metazirconate (Li2ZrO3) powders. In the first, a solid state powder reaction starting from lithium peroxide and zirconia fine commercial powders was performed. Alternatively, two wet routes were developed, both starting from metal alkoxides: the first consists of a hydrolysis and coprecipitation; the second route is based on the hydrolysis and polycondensation of the precursors, mixed in solution and gelled. Subsequently, the powders were calcined to obtain the lithium metazirconate. Uniaxial cold pressing and pressureless sintering were used to consolidate monoliths having about 80% of the theoretical density and a pore distribution which made the material suitable for the blanket of fusion reactors.

Url:
DOI: 10.1016/0955-2219(89)90024-1

Links to Exploration step

ISTEX:C30F4DAA429AFA0B51AB4EA436C21943251B1D13

Le document en format XML

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<p>Three methods have been developed to produce high purity, fine grained lithium metazirconate (Li2ZrO3) powders. In the first, a solid state powder reaction starting from lithium peroxide and zirconia fine commercial powders was performed. Alternatively, two wet routes were developed, both starting from metal alkoxides: the first consists of a hydrolysis and coprecipitation; the second route is based on the hydrolysis and polycondensation of the precursors, mixed in solution and gelled. Subsequently, the powders were calcined to obtain the lithium metazirconate. Uniaxial cold pressing and pressureless sintering were used to consolidate monoliths having about 80% of the theoretical density and a pore distribution which made the material suitable for the blanket of fusion reactors.</p>
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<p>Zur Herstellung von hochreinen, feinkristallinen Lithiummetazirkonatpulvern (Li2ZrO3) wurden drei verschiedene Methoden entwickelt. Als erstes wurde ein Festkörperreaktionsverfahren durchgeführt, bei dem feine, kommerzielle Lithiumperoxid- und Zirkonoxid-Pulver verwendet werden. Alternativ wurden zwei naßchemische Wege untersucht, die beide von Alkoxiden ausgehen: der erste besteht aus einer Hydrolyse und Kopräzipitation, der zweite basiert auf der Hydrolyse und Polykondensation (Gelierung) der Precursoren. Anschließend wurden diese Pulver kalziniert, um Lithiummetazirkonat zu erhalten. Nach dem einaxialen Pressen konnten durch druckloses Sintern monolithische Körper von c. 80% der theoretischen Dichte hergestellt werden, die aufgrund der Porenverteilung in den gesinterten Proben für die Auskleidung von Fusionsreaktoren geeignet sind.</p>
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<p>On a développé trois méthodes de production de poudres fines de métazirconate de lithium (Li2ZrO3) de haute pureté. La première repose sur la réaction en phase solide de fines poudres commerciales de peroxyde de lithium et de zircone. Les deux autres méthodes mettent en jeu des alcoolates métalliques en solution. L'une consiste en une hydrolyse-coprécipitation. L'autre est basée sur l'hydrolyse et la polycondensation des précurseurs mélangés en solution et gélifiés. Les poudres ont ensuite été calcinées pour obtenir le métazirconate de lithium. Le pressage uniaxial à froid des poudres suivi de leur frittage naturel conduit à des matériaux d'une densité relative d'environ 80%, présentant une distribution des pores les rendant adaptés à la protection des réacteurs de fusion.</p>
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<ce:sup>c</ce:sup>
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<ce:simple-para>Three methods have been developed to produce high purity, fine grained lithium metazirconate (Li
<ce:inf>2</ce:inf>
ZrO
<ce:inf>3</ce:inf>
) powders. In the first, a solid state powder reaction starting from lithium peroxide and zirconia fine commercial powders was performed. Alternatively, two wet routes were developed, both starting from metal alkoxides: the first consists of a hydrolysis and coprecipitation; the second route is based on the hydrolysis and polycondensation of the precursors, mixed in solution and gelled. Subsequently, the powders were calcined to obtain the lithium metazirconate. Uniaxial cold pressing and pressureless sintering were used to consolidate monoliths having about 80% of the theoretical density and a pore distribution which made the material suitable for the blanket of fusion reactors.</ce:simple-para>
</ce:abstract-sec>
</ce:abstract>
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<ce:simple-para>Zur Herstellung von hochreinen, feinkristallinen Lithiummetazirkonatpulvern (Li
<ce:inf>2</ce:inf>
ZrO
<ce:inf>3</ce:inf>
) wurden drei verschiedene Methoden entwickelt. Als erstes wurde ein Festkörperreaktionsverfahren durchgeführt, bei dem feine, kommerzielle Lithiumperoxid- und Zirkonoxid-Pulver verwendet werden. Alternativ wurden zwei naßchemische Wege untersucht, die beide von Alkoxiden ausgehen: der erste besteht aus einer Hydrolyse und Kopräzipitation, der zweite basiert auf der Hydrolyse und Polykondensation (Gelierung) der Precursoren. Anschließend wurden diese Pulver kalziniert, um Lithiummetazirkonat zu erhalten. Nach dem einaxialen Pressen konnten durch druckloses Sintern monolithische Körper von
<ce:italic>c.</ce:italic>
80% der theoretischen Dichte hergestellt werden, die aufgrund der Porenverteilung in den gesinterten Proben für die Auskleidung von Fusionsreaktoren geeignet sind.</ce:simple-para>
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<ce:section-title>Résumé</ce:section-title>
<ce:abstract-sec>
<ce:simple-para>On a développé trois méthodes de production de poudres fines de métazirconate de lithium (Li
<ce:inf>2</ce:inf>
ZrO
<ce:inf>3</ce:inf>
) de haute pureté. La première repose sur la réaction en phase solide de fines poudres commerciales de peroxyde de lithium et de zircone. Les deux autres méthodes mettent en jeu des alcoolates métalliques en solution. L'une consiste en une hydrolyse-coprécipitation. L'autre est basée sur l'hydrolyse et la polycondensation des précurseurs mélangés en solution et gélifiés. Les poudres ont ensuite été calcinées pour obtenir le métazirconate de lithium. Le pressage uniaxial à froid des poudres suivi de leur frittage naturel conduit à des matériaux d'une densité relative d'environ 80%, présentant une distribution des pores les rendant adaptés à la protection des réacteurs de fusion.</ce:simple-para>
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<title>Preparation of Li2ZrO3 by powder reaction and hydrolysis of metal alkoxides</title>
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<title>Preparation of Li</title>
</titleInfo>
<name type="personal">
<namePart type="given">C.</namePart>
<namePart type="family">Alvani</namePart>
<affiliation>ENEA, CRE-Casaccia, Chemistry Division, 00060-S.M. di Galeria, Rome, Italy</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">L.</namePart>
<namePart type="family">Bruzzi</namePart>
<affiliation>University of Bologna, Viale Risorgimento 2, 40122-Bologna, Italy</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">S.</namePart>
<namePart type="family">Casadio</namePart>
<affiliation>ENEA, CRE-Casaccia, Chemistry Division, 00060-S.M. di Galeria, Rome, Italy</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">V.</namePart>
<namePart type="family">Rondinella</namePart>
<affiliation>Centro Ceramico Bologna, Via Martelli 26, 40138-Bologna, Italy</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">A.</namePart>
<namePart type="family">Tucci</namePart>
<affiliation>Centro Ceramico Bologna, Via Martelli 26, 40138-Bologna, Italy</affiliation>
<role>
<roleTerm type="text">author</roleTerm>
</role>
</name>
<name type="personal">
<namePart type="given">E.H.</namePart>
<namePart type="family">Toscano</namePart>
<affiliation>Centro Ceramico Bologna, Via Martelli 26, 40138-Bologna, Italy</affiliation>
<affiliation>∗Present address: Commission of the European Communities, European Institute for Transuranium Elements, Postfach 2340, 7500 Karlsruhe, FRG.</affiliation>
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<dateIssued encoding="w3cdtf">1989</dateIssued>
<dateValid encoding="w3cdtf">1989-11-29</dateValid>
<dateModified encoding="w3cdtf">1989-11-08</dateModified>
<copyrightDate encoding="w3cdtf">1990</copyrightDate>
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<abstract lang="en">Three methods have been developed to produce high purity, fine grained lithium metazirconate (Li2ZrO3) powders. In the first, a solid state powder reaction starting from lithium peroxide and zirconia fine commercial powders was performed. Alternatively, two wet routes were developed, both starting from metal alkoxides: the first consists of a hydrolysis and coprecipitation; the second route is based on the hydrolysis and polycondensation of the precursors, mixed in solution and gelled. Subsequently, the powders were calcined to obtain the lithium metazirconate. Uniaxial cold pressing and pressureless sintering were used to consolidate monoliths having about 80% of the theoretical density and a pore distribution which made the material suitable for the blanket of fusion reactors.</abstract>
<abstract lang="de">Zur Herstellung von hochreinen, feinkristallinen Lithiummetazirkonatpulvern (Li2ZrO3) wurden drei verschiedene Methoden entwickelt. Als erstes wurde ein Festkörperreaktionsverfahren durchgeführt, bei dem feine, kommerzielle Lithiumperoxid- und Zirkonoxid-Pulver verwendet werden. Alternativ wurden zwei naßchemische Wege untersucht, die beide von Alkoxiden ausgehen: der erste besteht aus einer Hydrolyse und Kopräzipitation, der zweite basiert auf der Hydrolyse und Polykondensation (Gelierung) der Precursoren. Anschließend wurden diese Pulver kalziniert, um Lithiummetazirkonat zu erhalten. Nach dem einaxialen Pressen konnten durch druckloses Sintern monolithische Körper von c. 80% der theoretischen Dichte hergestellt werden, die aufgrund der Porenverteilung in den gesinterten Proben für die Auskleidung von Fusionsreaktoren geeignet sind.</abstract>
<abstract lang="fr">On a développé trois méthodes de production de poudres fines de métazirconate de lithium (Li2ZrO3) de haute pureté. La première repose sur la réaction en phase solide de fines poudres commerciales de peroxyde de lithium et de zircone. Les deux autres méthodes mettent en jeu des alcoolates métalliques en solution. L'une consiste en une hydrolyse-coprécipitation. L'autre est basée sur l'hydrolyse et la polycondensation des précurseurs mélangés en solution et gélifiés. Les poudres ont ensuite été calcinées pour obtenir le métazirconate de lithium. Le pressage uniaxial à froid des poudres suivi de leur frittage naturel conduit à des matériaux d'une densité relative d'environ 80%, présentant une distribution des pores les rendant adaptés à la protection des réacteurs de fusion.</abstract>
<relatedItem type="host">
<titleInfo>
<title>Journal of the European Ceramic Society</title>
</titleInfo>
<titleInfo type="abbreviated">
<title>JECS</title>
</titleInfo>
<originInfo>
<dateIssued encoding="w3cdtf">1989</dateIssued>
</originInfo>
<identifier type="ISSN">0955-2219</identifier>
<identifier type="PII">S0955-2219(00)X0145-8</identifier>
<part>
<date>1989</date>
<detail type="volume">
<number>5</number>
<caption>vol.</caption>
</detail>
<detail type="issue">
<number>5</number>
<caption>no.</caption>
</detail>
<extent unit="issue pages">
<start>269</start>
<end>331</end>
</extent>
<extent unit="pages">
<start>295</start>
<end>302</end>
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<identifier type="DOI">10.1016/0955-2219(89)90024-1</identifier>
<identifier type="PII">0955-2219(89)90024-1</identifier>
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