Transport properties of molybdenum trioxide and its suboxides
The electrical conductivity σ AC and the thermoelectric power α for the MoO 3-MoO 3− n -MoO 2 system, namely MoO 3, Mo 13O 38, Mo 9O 26, Mo 8O 23, Mo 17O 47, Mo 4O 11 and MoO 2, are measured over a wide temperature range. The conductivity value at room temperature is found to increase with departure...
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| Veröffentlicht in: | Thermochimica acta 1982-01, Vol.54 (1), p.35-45 |
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| creator | Khilla, M.A. Hanafi, Z.M. Farag, B.S. Abu-el Saud, A. |
| description | The electrical conductivity σ
AC and the thermoelectric power α for the MoO
3-MoO
3−
n
-MoO
2 system, namely MoO
3, Mo
13O
38, Mo
9O
26, Mo
8O
23, Mo
17O
47, Mo
4O
11 and MoO
2, are measured over a wide temperature range. The conductivity value at room temperature is found to increase with departure from stoichiometry. MoO
3 and its suboxides exhibit semiconducting behaviour while MoO
2 at low temperature exhibits semimetal-like character of 10
−2 Ω
−1 cm
−1 rather than a semiconducting one. Above room temperature MoO
2 gave a Δ
E value of 0.85 eV, indicating that this metal-like conduction is not taking place. Some discontinuities are present in the log σ vs. 1/
T curves for all samples. These are confirmed by DTA.
The thermoelectric power indicates that all oxides are
n-types semiconductors up to 300°C. The value at room temperature decreases with departure from stoichiometry. The most pronounced change of both σ and α is at Mo
8O
23, i.e. at
x=0.125. |
| doi_str_mv | 10.1016/0040-6031(82)85062-4 |
| format | Article |
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AC and the thermoelectric power α for the MoO
3-MoO
3−
n
-MoO
2 system, namely MoO
3, Mo
13O
38, Mo
9O
26, Mo
8O
23, Mo
17O
47, Mo
4O
11 and MoO
2, are measured over a wide temperature range. The conductivity value at room temperature is found to increase with departure from stoichiometry. MoO
3 and its suboxides exhibit semiconducting behaviour while MoO
2 at low temperature exhibits semimetal-like character of 10
−2 Ω
−1 cm
−1 rather than a semiconducting one. Above room temperature MoO
2 gave a Δ
E value of 0.85 eV, indicating that this metal-like conduction is not taking place. Some discontinuities are present in the log σ vs. 1/
T curves for all samples. These are confirmed by DTA.
The thermoelectric power indicates that all oxides are
n-types semiconductors up to 300°C. The value at room temperature decreases with departure from stoichiometry. The most pronounced change of both σ and α is at Mo
8O
23, i.e. at
x=0.125.</description><identifier>ISSN: 0040-6031</identifier><identifier>EISSN: 1872-762X</identifier><identifier>DOI: 10.1016/0040-6031(82)85062-4</identifier><language>eng</language><publisher>Elsevier B.V</publisher><ispartof>Thermochimica acta, 1982-01, Vol.54 (1), p.35-45</ispartof><rights>1982</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c335t-6c0a5703e71188a43cf1d3af3b9cbd9e59cd1d87eb120835b991c404770fd5dd3</citedby><cites>FETCH-LOGICAL-c335t-6c0a5703e71188a43cf1d3af3b9cbd9e59cd1d87eb120835b991c404770fd5dd3</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0040-6031(82)85062-4$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,27924,27925,45995</link.rule.ids></links><search><creatorcontrib>Khilla, M.A.</creatorcontrib><creatorcontrib>Hanafi, Z.M.</creatorcontrib><creatorcontrib>Farag, B.S.</creatorcontrib><creatorcontrib>Abu-el Saud, A.</creatorcontrib><title>Transport properties of molybdenum trioxide and its suboxides</title><title>Thermochimica acta</title><description>The electrical conductivity σ
AC and the thermoelectric power α for the MoO
3-MoO
3−
n
-MoO
2 system, namely MoO
3, Mo
13O
38, Mo
9O
26, Mo
8O
23, Mo
17O
47, Mo
4O
11 and MoO
2, are measured over a wide temperature range. The conductivity value at room temperature is found to increase with departure from stoichiometry. MoO
3 and its suboxides exhibit semiconducting behaviour while MoO
2 at low temperature exhibits semimetal-like character of 10
−2 Ω
−1 cm
−1 rather than a semiconducting one. Above room temperature MoO
2 gave a Δ
E value of 0.85 eV, indicating that this metal-like conduction is not taking place. Some discontinuities are present in the log σ vs. 1/
T curves for all samples. These are confirmed by DTA.
The thermoelectric power indicates that all oxides are
n-types semiconductors up to 300°C. The value at room temperature decreases with departure from stoichiometry. The most pronounced change of both σ and α is at Mo
8O
23, i.e. at
x=0.125.</description><issn>0040-6031</issn><issn>1872-762X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1982</creationdate><recordtype>article</recordtype><recordid>eNp9kE1LxDAQhoMouK7-Aw89iR6qk4826UFBFr9gwcsK3kKaTCHSNmvSivvv7e6KR08Dw_O-zDyEnFO4pkDLGwABeQmcXip2pQooWS4OyIwqyXJZsvdDMvtDjslJSh8AQJmCGbldRdOndYhDto5hjXHwmLLQZF1oN7XDfuyyIfrw7R1mpneZH1KWxnq3SKfkqDFtwrPfOSdvjw-rxXO-fH16Wdwvc8t5MeSlBVNI4CgpVcoIbhvquGl4XdnaVVhU1lGnJNaUgeJFXVXUChBSQuMK5_icXOx7pxs_R0yD7nyy2LamxzAmzThIwctyAsUetDGkFLHR6-g7Ezeagt660lsReitCK6Z3rrSYYnf7GE5PfHmMOlmPvUXnI9pBu-D_L_gB2SNwvg</recordid><startdate>19820101</startdate><enddate>19820101</enddate><creator>Khilla, M.A.</creator><creator>Hanafi, Z.M.</creator><creator>Farag, B.S.</creator><creator>Abu-el Saud, A.</creator><general>Elsevier B.V</general><scope>AAYXX</scope><scope>CITATION</scope><scope>7QQ</scope><scope>8FD</scope><scope>JG9</scope></search><sort><creationdate>19820101</creationdate><title>Transport properties of molybdenum trioxide and its suboxides</title><author>Khilla, M.A. ; Hanafi, Z.M. ; Farag, B.S. ; Abu-el Saud, A.</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c335t-6c0a5703e71188a43cf1d3af3b9cbd9e59cd1d87eb120835b991c404770fd5dd3</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1982</creationdate><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Khilla, M.A.</creatorcontrib><creatorcontrib>Hanafi, Z.M.</creatorcontrib><creatorcontrib>Farag, B.S.</creatorcontrib><creatorcontrib>Abu-el Saud, A.</creatorcontrib><collection>CrossRef</collection><collection>Ceramic Abstracts</collection><collection>Technology Research Database</collection><collection>Materials Research Database</collection><jtitle>Thermochimica acta</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Khilla, M.A.</au><au>Hanafi, Z.M.</au><au>Farag, B.S.</au><au>Abu-el Saud, A.</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Transport properties of molybdenum trioxide and its suboxides</atitle><jtitle>Thermochimica acta</jtitle><date>1982-01-01</date><risdate>1982</risdate><volume>54</volume><issue>1</issue><spage>35</spage><epage>45</epage><pages>35-45</pages><issn>0040-6031</issn><eissn>1872-762X</eissn><abstract>The electrical conductivity σ
AC and the thermoelectric power α for the MoO
3-MoO
3−
n
-MoO
2 system, namely MoO
3, Mo
13O
38, Mo
9O
26, Mo
8O
23, Mo
17O
47, Mo
4O
11 and MoO
2, are measured over a wide temperature range. The conductivity value at room temperature is found to increase with departure from stoichiometry. MoO
3 and its suboxides exhibit semiconducting behaviour while MoO
2 at low temperature exhibits semimetal-like character of 10
−2 Ω
−1 cm
−1 rather than a semiconducting one. Above room temperature MoO
2 gave a Δ
E value of 0.85 eV, indicating that this metal-like conduction is not taking place. Some discontinuities are present in the log σ vs. 1/
T curves for all samples. These are confirmed by DTA.
The thermoelectric power indicates that all oxides are
n-types semiconductors up to 300°C. The value at room temperature decreases with departure from stoichiometry. The most pronounced change of both σ and α is at Mo
8O
23, i.e. at
x=0.125.</abstract><pub>Elsevier B.V</pub><doi>10.1016/0040-6031(82)85062-4</doi><tpages>11</tpages></addata></record> |
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| language | eng |
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| source | Elsevier ScienceDirect Journals Complete |
| title | Transport properties of molybdenum trioxide and its suboxides |
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