Reaction characteristics of La0.84Sr0.16CrO3 formation
We studied the kinetics of La0.84Sr0.16CrO3 formation from a precursor consisting of La and Sr chromium oxides and carbonates made by spray roasting. Pure LaCrO3 becomes cubic at temperatures exceeding 1900 °C. Strontium doping lowers the transition temperature, for example, that of La0.84Sr0.16CrO3...
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| Veröffentlicht in: | Journal of materials science 1999-07, Vol.34 (13), p.3035-3041 |
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| container_issue | 13 |
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| container_title | Journal of materials science |
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| creator | WAGNER, A. L JACOBSON, A. J RICHARDSON, J. T LUSS, D |
| description | We studied the kinetics of La0.84Sr0.16CrO3 formation from a precursor consisting of La and Sr chromium oxides and carbonates made by spray roasting. Pure LaCrO3 becomes cubic at temperatures exceeding 1900 °C. Strontium doping lowers the transition temperature, for example, that of La0.84Sr0.16CrO3 is 1700 °C. This transition is gradual and occurs over a 700 °C range upon heating and cooling. Low temperature (LT) air calcination (450 °C) of the precursor yields a mixture of LaCrO4 and SrCrO4, which following 20 h of heating at 1440 °C produces a homogeneous powder. Secondary electron images of this precursor reveal dense spheres with 95% of the theoretical density of La0.84Sr0.16CrO3. High temperature (HT) calcination (800 °C) yields a mixture of LaCrO3 and SrCrO4, which following 40 h of heating at 1500 °C produces a uniform product. The LT and HT calcination causes oxygen loss. |
| doi_str_mv | 10.1023/A:1004676210960 |
| format | Article |
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L ; JACOBSON, A. J ; RICHARDSON, J. T ; LUSS, D</creator><contributor>WCA</contributor><creatorcontrib>WAGNER, A. L ; JACOBSON, A. J ; RICHARDSON, J. T ; LUSS, D ; WCA</creatorcontrib><description>We studied the kinetics of La0.84Sr0.16CrO3 formation from a precursor consisting of La and Sr chromium oxides and carbonates made by spray roasting. Pure LaCrO3 becomes cubic at temperatures exceeding 1900 °C. Strontium doping lowers the transition temperature, for example, that of La0.84Sr0.16CrO3 is 1700 °C. This transition is gradual and occurs over a 700 °C range upon heating and cooling. Low temperature (LT) air calcination (450 °C) of the precursor yields a mixture of LaCrO4 and SrCrO4, which following 20 h of heating at 1440 °C produces a homogeneous powder. Secondary electron images of this precursor reveal dense spheres with 95% of the theoretical density of La0.84Sr0.16CrO3. High temperature (HT) calcination (800 °C) yields a mixture of LaCrO3 and SrCrO4, which following 40 h of heating at 1500 °C produces a uniform product. The LT and HT calcination causes oxygen loss.</description><identifier>ISSN: 0022-2461</identifier><identifier>EISSN: 1573-4803</identifier><identifier>DOI: 10.1023/A:1004676210960</identifier><identifier>CODEN: JMTSAS</identifier><language>eng</language><publisher>Heidelberg: Springer</publisher><subject>Carbonates ; Chemistry ; Chromium oxides ; Electron imaging ; Exact sciences and technology ; Heating ; High temperature ; Inorganic chemistry and origins of life ; Kinetics and mechanism of reactions ; Materials science ; Precursors ; Reaction kinetics ; Roasting ; Strontium ; Theoretical density ; Transition temperature</subject><ispartof>Journal of materials science, 1999-07, Vol.34 (13), p.3035-3041</ispartof><rights>1999 INIST-CNRS</rights><rights>Journal of Materials Science is a copyright of Springer, (1999). 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Pure LaCrO3 becomes cubic at temperatures exceeding 1900 °C. Strontium doping lowers the transition temperature, for example, that of La0.84Sr0.16CrO3 is 1700 °C. This transition is gradual and occurs over a 700 °C range upon heating and cooling. Low temperature (LT) air calcination (450 °C) of the precursor yields a mixture of LaCrO4 and SrCrO4, which following 20 h of heating at 1440 °C produces a homogeneous powder. Secondary electron images of this precursor reveal dense spheres with 95% of the theoretical density of La0.84Sr0.16CrO3. High temperature (HT) calcination (800 °C) yields a mixture of LaCrO3 and SrCrO4, which following 40 h of heating at 1500 °C produces a uniform product. The LT and HT calcination causes oxygen loss.</description><subject>Carbonates</subject><subject>Chemistry</subject><subject>Chromium oxides</subject><subject>Electron imaging</subject><subject>Exact sciences and technology</subject><subject>Heating</subject><subject>High temperature</subject><subject>Inorganic chemistry and origins of life</subject><subject>Kinetics and mechanism of reactions</subject><subject>Materials science</subject><subject>Precursors</subject><subject>Reaction kinetics</subject><subject>Roasting</subject><subject>Strontium</subject><subject>Theoretical density</subject><subject>Transition temperature</subject><issn>0022-2461</issn><issn>1573-4803</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1999</creationdate><recordtype>article</recordtype><sourceid>AFKRA</sourceid><sourceid>BENPR</sourceid><sourceid>CCPQU</sourceid><sourceid>DWQXO</sourceid><recordid>eNpdzstLw0AQBvBFFKyPs9eA4i11Zt_xVoovKBR8nMNks4spaVJ304P_vSv25GkGvh8zH2NXCHMELu4W9wggtdEcodJwxGaojCilBXHMZgCcl1xqPGVnKW0AQBmOM6ZfPbmpG4fCfVLMq49dmjqXijEUK4K5lW8xf9DLuBZFGOOWfvUFOwnUJ395mOfs4_HhfflcrtZPL8vFqtxxiVPZch9EaIxDFK2RuaCXjSMuWkkteBckSRKETU4rbnLW2sYL7ZRyaFwjztnt391dHL_2Pk31tkvO9z0NftynmhtEq7TJ8Pof3Iz7OORuNeeqspVQ2mZ1c1CUHPUh0uC6VO9it6X4XaPVQmslfgDW62Cd</recordid><startdate>19990701</startdate><enddate>19990701</enddate><creator>WAGNER, A. 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Low temperature (LT) air calcination (450 °C) of the precursor yields a mixture of LaCrO4 and SrCrO4, which following 20 h of heating at 1440 °C produces a homogeneous powder. Secondary electron images of this precursor reveal dense spheres with 95% of the theoretical density of La0.84Sr0.16CrO3. High temperature (HT) calcination (800 °C) yields a mixture of LaCrO3 and SrCrO4, which following 40 h of heating at 1500 °C produces a uniform product. The LT and HT calcination causes oxygen loss.</abstract><cop>Heidelberg</cop><pub>Springer</pub><doi>10.1023/A:1004676210960</doi><tpages>7</tpages></addata></record> |
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| subjects | Carbonates Chemistry Chromium oxides Electron imaging Exact sciences and technology Heating High temperature Inorganic chemistry and origins of life Kinetics and mechanism of reactions Materials science Precursors Reaction kinetics Roasting Strontium Theoretical density Transition temperature |
| title | Reaction characteristics of La0.84Sr0.16CrO3 formation |
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