Polymorphism under pressure of the disilicates of the heavier lanthanoids Ln 2Si2O7 ( Ln = Tm, Yb, Lu)
Identifieur interne : 002711 ( Istex/Corpus ); précédent : 002710; suivant : 002712Polymorphism under pressure of the disilicates of the heavier lanthanoids Ln 2Si2O7 ( Ln = Tm, Yb, Lu)
Auteurs : G. Bocquillon ; C. Chateau ; C. Loriers ; J. LoriersSource :
- Journal of Solid State Chemistry [ 0022-4596 ] ; 1977.
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Abstract
Abstract: A study of the phase diagram of thulium, ytterbium, and lutecium disilicates Ln2Si2O7 in the ranges 0–70 kbar and 20–1600°C shows the extended polymorphism under high pressure of these compounds of which only one form was previously known at ambient pressure. The monoclinic D form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic B form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal X form so far unknown in the disilicate series and isostructural with Er2Ge2O7 is obtained for the three compounds. Compared to the B form it is a low temperature, low pressure form. The crystal data of the nine high pressure phases are given.
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DOI: 10.1016/0022-4596(77)90060-3
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Briand 92190 Bellevue, France</mods:affiliation></affiliation></author><author><name sortKey="Loriers, J" sort="Loriers, J" uniqKey="Loriers J" first="J." last="Loriers">J. Loriers</name><affiliation><mods:affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. 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Briand 92190 Bellevue, France</mods:affiliation></affiliation></author><author><name sortKey="Chateau, C" sort="Chateau, C" uniqKey="Chateau C" first="C." last="Chateau">C. Chateau</name><affiliation><mods:affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</mods:affiliation></affiliation></author><author><name sortKey="Loriers, C" sort="Loriers, C" uniqKey="Loriers C" first="C." last="Loriers">C. Loriers</name><affiliation><mods:affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</mods:affiliation></affiliation></author><author><name sortKey="Loriers, J" sort="Loriers, J" uniqKey="Loriers J" first="J." last="Loriers">J. Loriers</name><affiliation><mods:affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. 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The monoclinic D form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic B form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal X form so far unknown in the disilicate series and isostructural with Er2Ge2O7 is obtained for the three compounds. Compared to the B form it is a low temperature, low pressure form. The crystal data of the nine high pressure phases are given.</div></front></TEI><istex><corpusName>elsevier</corpusName><keywords><teeft><json:string>disilicates</json:string><json:string>kbar</json:string><json:string>bocquillon</json:string><json:string>polymorphism</json:string><json:string>felsche</json:string><json:string>smolin</json:string><json:string>loriers</json:string><json:string>lanthanoid</json:string><json:string>atmospheric pressure</json:string><json:string>rare earth</json:string><json:string>powder diffraction patterns</json:string><json:string>crystal data</json:string></teeft></keywords><author><json:item><name>G. Bocquillon</name><affiliations><json:string>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</json:string></affiliations></json:item><json:item><name>C. Chateau</name><affiliations><json:string>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</json:string></affiliations></json:item><json:item><name>C. Loriers</name><affiliations><json:string>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</json:string></affiliations></json:item><json:item><name>J. Loriers</name><affiliations><json:string>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</json:string></affiliations></json:item></author><language><json:string>eng</json:string></language><originalGenre><json:string>Full-length article</json:string></originalGenre><abstract>A study of the phase diagram of thulium, ytterbium, and lutecium disilicates Ln2Si2O7 in the ranges 0–70 kbar and 20–1600°C shows the extended polymorphism under high pressure of these compounds of which only one form was previously known at ambient pressure. The monoclinic D form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic B form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal X form so far unknown in the disilicate series and isostructural with Er2Ge2O7 is obtained for the three compounds. Compared to the B form it is a low temperature, low pressure form. 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A. Briand 92190 Bellevue, France</affiliation></author><author xml:id="author-0001"><persName><forename type="first">C.</forename><surname>Chateau</surname></persName><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation></author><author xml:id="author-0002"><persName><forename type="first">C.</forename><surname>Loriers</surname></persName><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation></author><author xml:id="author-0003"><persName><forename type="first">J.</forename><surname>Loriers</surname></persName><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation></author><idno type="istex">AFD84BAAA7D1E9E4CEC7E02F7C87E20E8539FD88</idno><idno type="DOI">10.1016/0022-4596(77)90060-3</idno><idno type="PII">0022-4596(77)90060-3</idno></analytic><monogr><title level="j">Journal of Solid State Chemistry</title><title level="j" type="abbrev">YJSSC</title><idno type="pISSN">0022-4596</idno><idno type="PII">S0022-4596(00)X0189-2</idno><imprint><publisher>ELSEVIER</publisher><date type="published" when="1977"></date><biblScope unit="volume">20</biblScope><biblScope unit="issue">2</biblScope><biblScope unit="page" from="135">135</biblScope><biblScope unit="page" to="141">141</biblScope></imprint></monogr></biblStruct></sourceDesc></fileDesc><profileDesc><creation><date>1977</date></creation><langUsage><language ident="en">en</language></langUsage><abstract xml:lang="en"><p>A study of the phase diagram of thulium, ytterbium, and lutecium disilicates Ln2Si2O7 in the ranges 0–70 kbar and 20–1600°C shows the extended polymorphism under high pressure of these compounds of which only one form was previously known at ambient pressure. The monoclinic D form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic B form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal X form so far unknown in the disilicate series and isostructural with Er2Ge2O7 is obtained for the three compounds. Compared to the B form it is a low temperature, low pressure form. 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A. Briand 92190 Bellevue, France</ce:textfn></ce:affiliation></ce:author-group><ce:date-received day="29" month="12" year="1975"></ce:date-received><ce:date-revised day="10" month="9" year="1976"></ce:date-revised><ce:abstract><ce:section-title>Abstract</ce:section-title><ce:abstract-sec><ce:simple-para>A study of the phase diagram of thulium, ytterbium, and lutecium disilicates <ce:italic>Ln</ce:italic><ce:inf>2</ce:inf>Si<ce:inf>2</ce:inf>O<ce:inf>7</ce:inf> in the ranges 0–70 kbar and 20–1600°C shows the extended polymorphism under high pressure of these compounds of which only one form was previously known at ambient pressure. The monoclinic <ce:italic>D</ce:italic> form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic <ce:italic>B</ce:italic> form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal <ce:italic>X</ce:italic> form so far unknown in the disilicate series and isostructural with Er<ce:inf>2</ce:inf>Ge<ce:inf>2</ce:inf>O<ce:inf>7</ce:inf> is obtained for the three compounds. Compared to the <ce:italic>B</ce:italic> form it is a low temperature, low pressure form. The crystal data of the nine high pressure phases are given.</ce:simple-para></ce:abstract-sec></ce:abstract></head></converted-article></istex:document></istex:metadataXml><mods version="3.6"><titleInfo><title>Polymorphism under pressure of the disilicates of the heavier lanthanoids Ln 2Si2O7 ( Ln = Tm, Yb, Lu)</title></titleInfo><titleInfo type="alternative" contentType="CDATA"><title>Polymorphism under pressure of the disilicates of the heavier lanthanoids</title></titleInfo><name type="personal"><namePart type="given">G.</namePart><namePart type="family">Bocquillon</namePart><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Chateau</namePart><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">C.</namePart><namePart type="family">Loriers</namePart><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><name type="personal"><namePart type="given">J.</namePart><namePart type="family">Loriers</namePart><affiliation>Laboratoire de Recherche sur les Terres Rares, C.N.R.S., 1 pl. A. Briand 92190 Bellevue, France</affiliation><role><roleTerm type="text">author</roleTerm></role></name><typeOfResource>text</typeOfResource><genre type="research-article" displayLabel="Full-length article" authority="ISTEX" authorityURI="https://content-type.data.istex.fr" valueURI="https://content-type.data.istex.fr/ark:/67375/XTP-1JC4F85T-7">research-article</genre><originInfo><publisher>ELSEVIER</publisher><dateIssued encoding="w3cdtf">1977</dateIssued><dateModified encoding="w3cdtf">1976-09-10</dateModified><copyrightDate encoding="w3cdtf">1977</copyrightDate></originInfo><language><languageTerm type="code" authority="iso639-2b">eng</languageTerm><languageTerm type="code" authority="rfc3066">en</languageTerm></language><abstract lang="en">Abstract: A study of the phase diagram of thulium, ytterbium, and lutecium disilicates Ln2Si2O7 in the ranges 0–70 kbar and 20–1600°C shows the extended polymorphism under high pressure of these compounds of which only one form was previously known at ambient pressure. The monoclinic D form appears at temperatures much lower than for the neighboring members of the series and its stability field is restricted to a rather narrow pressure interval around 20 kbar. The triclinic B form appears at pressures which increase from 20 to 40 kbar from Tm to Lu. A new tetragonal X form so far unknown in the disilicate series and isostructural with Er2Ge2O7 is obtained for the three compounds. Compared to the B form it is a low temperature, low pressure form. 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