Growth of dendritic and needle tungsten oxide crystals studied by high-resolution electron microscopy
Needle crystals of β-WO 2.90 and λ-WO 2.72 are produced by heating α-WO 3 powder in a vacuum apparatus under various air pressures. Whether β-or λ-tungsten oxide is produced depends on the specimen temperature rather than on the air pressure. The initial stages of the growing process of dendritic or...
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| Veröffentlicht in: | Ultramicroscopy 1994, Vol.54 (2), p.201-206 |
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| creator | Kumao, Akihiro Fujita, Yasuhiko Endoh, Hisamitsu |
| description | Needle crystals of β-WO
2.90 and λ-WO
2.72 are produced by heating α-WO
3 powder in a vacuum apparatus under various air pressures. Whether β-or λ-tungsten oxide is produced depends on the specimen temperature rather than on the air pressure. The initial stages of the growing process of dendritic or needle crystals have been observed using a high-resolution electron microscope. It is found that bumps which are formed on the surface of a mother needle crystal are necessary for the growth of dendrite crystals. When no bumps are formed on the surface, single needle crystals grow. The needle axis is the
b-axis on both β- and ω-tungsten oxides which belong to the same monoclinic system. In this study no amorphous drops have been observed on top of any needle crystal. |
| doi_str_mv | 10.1016/0304-3991(94)90118-X |
| format | Article |
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2.90 and λ-WO
2.72 are produced by heating α-WO
3 powder in a vacuum apparatus under various air pressures. Whether β-or λ-tungsten oxide is produced depends on the specimen temperature rather than on the air pressure. The initial stages of the growing process of dendritic or needle crystals have been observed using a high-resolution electron microscope. It is found that bumps which are formed on the surface of a mother needle crystal are necessary for the growth of dendrite crystals. When no bumps are formed on the surface, single needle crystals grow. The needle axis is the
b-axis on both β- and ω-tungsten oxides which belong to the same monoclinic system. In this study no amorphous drops have been observed on top of any needle crystal.</description><identifier>ISSN: 0304-3991</identifier><identifier>EISSN: 1879-2723</identifier><identifier>DOI: 10.1016/0304-3991(94)90118-X</identifier><identifier>CODEN: ULTRD6</identifier><language>eng</language><publisher>Amsterdam: Elsevier B.V</publisher><subject>Condensed matter: structure, mechanical and thermal properties ; Electron, ion, and scanning probe microscopy ; Exact sciences and technology ; Physics ; Structure of solids and liquids; crystallography ; Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties) ; Transmission, reflection and scanning electron microscopy(including ebic) ; Whiskers and dendrites (growth, structure, and nonelectronic properties)</subject><ispartof>Ultramicroscopy, 1994, Vol.54 (2), p.201-206</ispartof><rights>1994</rights><rights>1994 INIST-CNRS</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c364t-77671519b49aa6262ad3fd11e60a7476a038c9a32e959038e2d9b03ce01469483</citedby><cites>FETCH-LOGICAL-c364t-77671519b49aa6262ad3fd11e60a7476a038c9a32e959038e2d9b03ce01469483</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><linktohtml>$$Uhttps://dx.doi.org/10.1016/0304-3991(94)90118-X$$EHTML$$P50$$Gelsevier$$H</linktohtml><link.rule.ids>314,780,784,3550,4024,27923,27924,27925,45995</link.rule.ids><backlink>$$Uhttp://pascal-francis.inist.fr/vibad/index.php?action=getRecordDetail&idt=4219546$$DView record in Pascal Francis$$Hfree_for_read</backlink></links><search><creatorcontrib>Kumao, Akihiro</creatorcontrib><creatorcontrib>Fujita, Yasuhiko</creatorcontrib><creatorcontrib>Endoh, Hisamitsu</creatorcontrib><title>Growth of dendritic and needle tungsten oxide crystals studied by high-resolution electron microscopy</title><title>Ultramicroscopy</title><description>Needle crystals of β-WO
2.90 and λ-WO
2.72 are produced by heating α-WO
3 powder in a vacuum apparatus under various air pressures. Whether β-or λ-tungsten oxide is produced depends on the specimen temperature rather than on the air pressure. The initial stages of the growing process of dendritic or needle crystals have been observed using a high-resolution electron microscope. It is found that bumps which are formed on the surface of a mother needle crystal are necessary for the growth of dendrite crystals. When no bumps are formed on the surface, single needle crystals grow. The needle axis is the
b-axis on both β- and ω-tungsten oxides which belong to the same monoclinic system. In this study no amorphous drops have been observed on top of any needle crystal.</description><subject>Condensed matter: structure, mechanical and thermal properties</subject><subject>Electron, ion, and scanning probe microscopy</subject><subject>Exact sciences and technology</subject><subject>Physics</subject><subject>Structure of solids and liquids; crystallography</subject><subject>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</subject><subject>Transmission, reflection and scanning electron microscopy(including ebic)</subject><subject>Whiskers and dendrites (growth, structure, and nonelectronic properties)</subject><issn>0304-3991</issn><issn>1879-2723</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>1994</creationdate><recordtype>article</recordtype><recordid>eNp9kM1KAzEURoMoWKtv4CILEV2MJpM0M9kIUrQKBTcK3YU0udNGpklNMmrf3qktLl3duzjf_TkInVNyQwkVt4QRXjAp6ZXk15JQWhezAzSgdSWLsirZIRr8IcfoJKV3QgglvB4gmMTwlZc4NNiCt9FlZ7D2FnsA2wLOnV-kDB6Hb2cBm7hJWbcJp9xZBxbPN3jpFssiQgptl13wGFowOfbNypkYkgnrzSk6avoUnO3rEL09PryOn4rpy-R5fD8tDBM8F1UlKjqics6l1qIUpbassZSCILrildCE1UZqVoIcyb6H0so5YQYI5ULymg3R5W7uOoaPDlJWK5cMtK32ELqkSsHJSNa0B_kO3F6YIjRqHd1Kx42iRG2dqq0wtRWmJFe_TtWsj13s5-tkdNtE7Y1Lf1leUjniosfudhj0v346iCoZB96AdbF3o2xw_-_5AfaZi6M</recordid><startdate>1994</startdate><enddate>1994</enddate><creator>Kumao, Akihiro</creator><creator>Fujita, Yasuhiko</creator><creator>Endoh, Hisamitsu</creator><general>Elsevier B.V</general><general>Elsevier Science</general><scope>IQODW</scope><scope>AAYXX</scope><scope>CITATION</scope><scope>7U5</scope><scope>8FD</scope><scope>L7M</scope></search><sort><creationdate>1994</creationdate><title>Growth of dendritic and needle tungsten oxide crystals studied by high-resolution electron microscopy</title><author>Kumao, Akihiro ; Fujita, Yasuhiko ; Endoh, Hisamitsu</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c364t-77671519b49aa6262ad3fd11e60a7476a038c9a32e959038e2d9b03ce01469483</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>1994</creationdate><topic>Condensed matter: structure, mechanical and thermal properties</topic><topic>Electron, ion, and scanning probe microscopy</topic><topic>Exact sciences and technology</topic><topic>Physics</topic><topic>Structure of solids and liquids; crystallography</topic><topic>Surfaces and interfaces; thin films and whiskers (structure and nonelectronic properties)</topic><topic>Transmission, reflection and scanning electron microscopy(including ebic)</topic><topic>Whiskers and dendrites (growth, structure, and nonelectronic properties)</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Kumao, Akihiro</creatorcontrib><creatorcontrib>Fujita, Yasuhiko</creatorcontrib><creatorcontrib>Endoh, Hisamitsu</creatorcontrib><collection>Pascal-Francis</collection><collection>CrossRef</collection><collection>Solid State and Superconductivity Abstracts</collection><collection>Technology Research Database</collection><collection>Advanced Technologies Database with Aerospace</collection><jtitle>Ultramicroscopy</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Kumao, Akihiro</au><au>Fujita, Yasuhiko</au><au>Endoh, Hisamitsu</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Growth of dendritic and needle tungsten oxide crystals studied by high-resolution electron microscopy</atitle><jtitle>Ultramicroscopy</jtitle><date>1994</date><risdate>1994</risdate><volume>54</volume><issue>2</issue><spage>201</spage><epage>206</epage><pages>201-206</pages><issn>0304-3991</issn><eissn>1879-2723</eissn><coden>ULTRD6</coden><abstract>Needle crystals of β-WO
2.90 and λ-WO
2.72 are produced by heating α-WO
3 powder in a vacuum apparatus under various air pressures. Whether β-or λ-tungsten oxide is produced depends on the specimen temperature rather than on the air pressure. The initial stages of the growing process of dendritic or needle crystals have been observed using a high-resolution electron microscope. It is found that bumps which are formed on the surface of a mother needle crystal are necessary for the growth of dendrite crystals. When no bumps are formed on the surface, single needle crystals grow. The needle axis is the
b-axis on both β- and ω-tungsten oxides which belong to the same monoclinic system. In this study no amorphous drops have been observed on top of any needle crystal.</abstract><cop>Amsterdam</cop><pub>Elsevier B.V</pub><doi>10.1016/0304-3991(94)90118-X</doi><tpages>6</tpages></addata></record> |
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| identifier | ISSN: 0304-3991 |
| ispartof | Ultramicroscopy, 1994, Vol.54 (2), p.201-206 |
| issn | 0304-3991 1879-2723 |
| language | eng |
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| source | Access via ScienceDirect (Elsevier) |
| subjects | Condensed matter: structure, mechanical and thermal properties Electron, ion, and scanning probe microscopy Exact sciences and technology Physics Structure of solids and liquids crystallography Surfaces and interfaces thin films and whiskers (structure and nonelectronic properties) Transmission, reflection and scanning electron microscopy(including ebic) Whiskers and dendrites (growth, structure, and nonelectronic properties) |
| title | Growth of dendritic and needle tungsten oxide crystals studied by high-resolution electron microscopy |
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