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108 results about "Polymorphs of silicon carbide" patented technology

Many compound materials exhibit polymorphism, that is they can exist in different structures called polymorphs. Silicon carbide (SiC) is unique in this regard as more than 250 polymorphs of silicon carbide had been identified by 2006, with some of them having a lattice constant as long as 301.5 nm, about one thousand times the usual SiC lattice spacings.

Control and monitoring of non-resonant radiation-induced nucleation, crystallization, and polymorph formation

The invention relates to methods of assessing the polymorphic form of a substance by assessing Raman-shifted radiation scattered by a particle of the substance. The method is useful, for example, for assessing particle sizes and size distributions in mixtures containing both particles of the substance and other materials. The invention also relates to methods of selecting and controlling polymorph formation by illuminating a material with non-resonant (i.e., non-absorbed) laser radiation as it is thermally driven through a phase transition temperature.
Owner:CHEMIMAGE

Polymorphs of bicifadine hydrochloride

InactiveUS20040102638A1BiocideNervous disorderCrystallographyBicifadine Hydrochloride
A new polymorphic crystalline form of bicifadine hydrochloride, designated form B, which is more thermodynamically stable than the previously known polymorphic form of bicifadine hydrochloride, designated as form A, methods for preparing said crystalline form B and pharmaceutical compositions containing said crystalline form B.
Owner:EBI LIFE SCI INC

Imatinib mesylate polymorph and pharmaceutical composition

ActiveCN102070605ANot suitable for the needs of large-scale and stable productionSimple preparation processOrganic active ingredientsSenses disorderImatinib mesylateMedicine
The invention discloses an imatinib mesylate polymorph I, which is a typical X-ray diffraction pattern and has a diffraction peak at 2theta of 17.7+ / -0.2 degrees, 18.1+ / -0.2 degrees, 18.6+ / -0.2 degrees, 19.1+ / -0.2 degrees, 19.7+ / -0.2 degrees and 20.4+ / -0.2 degrees. In addition, the invention also discloses a preparation method thereof and a pharmaceutical composition. The imatinib mesylate polymorph I has the advantages of high purity, excellent physicochemical property and high stability, and is more suitable for industrial mass production.
Owner:NANJING CAVENDISH BIO ENG TECH +1

Silicon carbide single crystal and method and apparatus for producing the same

A method of producing a silicon carbide single crystal in which a sublimation raw material 40 is accommodated at the side of vessel body 12 in a graphite crucible 10, placing a seed crystal of a silicon carbide single crystal at the side of cover body 11 of the graphite crucible 10, the sublimation raw material 40 is sublimated by a first induction heating coil 21 placed at the side of sublimation raw material 40, a re-crystallization atmosphere is form by a second induction heating coil 20 placed at the side of cover body 11 so that the sublimation raw material 40 sublimated by the first induction heating coil 21 is re-crystallizable only in the vicinity of the seed crystal of a silicon carbide single crystal, and the sublimation raw material 40 is re-crystallized on the seed crystal of a silicon carbide single crystal, and a silicon carbide single crystal 60 is grown while keeping the whole surface of its growth surface in convex shape through the all growth processes.A high quality silicon carbide single crystal with large diameter excellent in dielectric breakdown property, heat resistance, radiation resistance and the like, suitable for electronic and optical devices and the like, and showing no contamination of polycrystals and polymorphs, no defect of micropipes and the like can be produced efficiently without cracking and the like.
Owner:RESONAC HOLDINGS CORPORATION

Stable crystalline salts of antifolate compounds

The present invention provides stable crystalline polymorphic forms of antifolate compounds, particularly (S)-2-{4-[2-(2,4-diamino-quinazolin-6-yl)-ethyl]-benzoylamino}-4-methylene-pentanedioic acid, dipotassium salt, and methods of preparation thereof The polymorphs may be in the form of hydrates. The invention further provides pharmaceutical compositions comprising the polymorphs and methods of treatment using the polymorphs. The polymorphs are useful in the treatment of multiple conditions, including abnormal cell proliferation, inflammatory diseases, asthma, and arthritis, and the polymorphs may be administered alone in or combination with on or more further active agents.
Owner:CHELSEA THERAPEUTICS

Polymorphs of atorvastatin tert.-butylester and use as intermediates for the preparation of atorvastatin

The invention relates to crystalline forms and 1 and 2 of atorvastatin tert.-butyl ester (Formula (II)), processes for their preparation and their conversion to highly pure atorvastatin hemi calcium in non-crystalline, in particular amorphous form.
Owner:新梅斯托卡尔卡托瓦纳兹德拉韦尔公司

Anhydrous polymorphs of [(2r,3s,4r,5r)-5-(6-(cyclopentylamino)-9h-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)} methyl nitrate and processes of preparation thereof

The present invention provides novel anhydrous polymorph forms of 2R,3S,4R,5R)-5-(6-(cyclopentylamino)-9H-purin-9-yl)-3,4-dihydroxytetrahydrofuran-2-yl)methyl nitrate (Compound A). The present invention also provides processes for preparation of the anhydrous polymorphic forms of compound A.
Owner:INOTECK PHARMA CORP

Processes for the preparation of highly pure rivaroxaban crystal modification i

Provided herein are improved, commercially viable and consistently reproducible processes for the preparation of highly pure crystal Modification I of Rivaroxaban, which is free from other polymorphs and undesired solvated forms. Provided also herein is a highly pure and stable crystal Modification I of Rivaroxaban essentially free of other solid state forms.
Owner:SYMED LABS

Polymorphs of herbicidal sulfonamides

Solid polymorphic forms of sulfentrazone are described. Particularly, a new polymorphic form of sulfentrazone is described herein as sulfentrazone-1, having surprising property advantages over technical sulfentrazone. Processes for the preparation of sulfentrazone-1, herbicidal compositions comprising sulfentrazone-1, and methods of its use are described.
Owner:FMC CORP
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