http://rdf.ncbi.nlm.nih.gov/pubchem/patent/JP-2009040630-A
Outgoing Links
| Predicate | Object |
|---|---|
| assignee | http://rdf.ncbi.nlm.nih.gov/pubchem/patentassignee/MD5_1d29f7ac2c7f9be9f7dae1a83bbb5c92 |
| classificationIPCInventive | http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C30B29-12 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/C30B15-00 http://rdf.ncbi.nlm.nih.gov/pubchem/patentipc/G02C1-02 |
| filingDate | 2007-08-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| inventor | http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_cd647d4868b051b2ec3cceb5d524b729 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_4c7517fe04d118e639399933fbceb783 http://rdf.ncbi.nlm.nih.gov/pubchem/patentinventor/MD5_e8e4f0d0177a18b90adfd8c2f488cbc5 |
| publicationDate | 2009-02-26-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| publicationNumber | JP-2009040630-A |
| titleOfInvention | Method for producing metal fluoride single crystal using apparatus for pulling metal fluoride single crystal |
| abstract | Provided is a method for reducing the uptake / residuality of a metal component constituting a solid scavenger, which is one factor of deterioration of internal transmittance of a metal fluoride single crystal used for an optical member or the like. To do. The scavenging reaction, the raw material melting and the crystallization are performed so that the solid scavenger used or the molten liquid thereof and the raw material metal fluoride 19 or the molten liquid 23 do not contact each other. For example, using a double structure crucible, the solid scavenger is accommodated in a member 22 having a recess provided under the opening shielding member 15 attached to the outer wall of the inner crucible 2. As a result, the raw material metal fluoride 19 accommodated in the outer crucible 1 is not in direct contact, and the gasified scavenger fills the semi-enclosed space formed by the outer crucible 1, the inner crucible 2 and the opening shielding member 15. In addition, since the residence time becomes longer, the efficiency of the scavenge reaction does not decrease. Further, even in the melting / crystallization step, it can be prevented from contacting the raw material metal fluoride melt 23. [Selection] Figure 8 |
| priorityDate | 2007-08-08-04:00^^<http://www.w3.org/2001/XMLSchema#date> |
| type | http://data.epo.org/linked-data/def/patent/Publication |
Incoming Links
Total number of triples: 43.