نتایج جستجو برای: polymorph

تعداد نتایج: 2081  

Journal: :Crystals 2022

We report herein a theoretical study of the high-pressure compressibility Cd3V2O8, Zn3V2O8, Mg3V2O8, and Ni3V2O8. For we also present its structural stability. Computer simulations were performed by means first-principles methods using CRYSTAL program. In found previously unreported polymorph which is thermodynamically more stable than already known polymorph. determined all compounds evaluated...

Journal: :Proceedings of the National Academy of Sciences of the United States of America 2015
Wenhao Sun Saivenkataraman Jayaraman Wei Chen Kristin A Persson Gerbrand Ceder

Predicting the conditions in which a compound adopts a metastable structure when it crystallizes out of solution is an unsolved and fundamental problem in materials synthesis, and one which, if understood and harnessed, could enable the rational design of synthesis pathways toward or away from metastable structures. Crystallization of metastable phases is particularly accessible via low-tempera...

Journal: :Acta Crystallographica Section E Structure Reports Online 2004

Journal: :Acta Crystallographica Section E Structure Reports Online 2008

2015
Jiří Tuček Libor Machala Shigeaki Ono Asuka Namai Marie Yoshikiyo Kenta Imoto Hiroko Tokoro Shin-ichi Ohkoshi Radek Zbořil

Iron(III) oxide shows a polymorphism, characteristic of existence of phases with the same chemical composition but distinct crystal structures and, hence, physical properties. Four crystalline phases of iron(III) oxide have previously been identified: α-Fe2O3 (hematite), β-Fe2O3, γ-Fe2O3 (maghemite), and ε-Fe2O3. All four iron(III) oxide phases easily undergo various phase transformations in re...

Journal: :Indian journal of physiology and pharmacology 2009
Sandeep K Mathur Rajkumar Rathore Shivani Chandra B B Sharma Lokender Sharma Prashant Mathur Mukul Mathur

To determine the various factors influencing glycemic response to pioglitazone monotherapy in newly diagnosed Asian Indian T2DM patients. Thirty T2DM patients (age 53.23 +/- 8.067 yrs, M: F ratio 14:16) were treated with pioglitazone for at least 14 weeks. Relationship between its glucose lowering effect and following patient parameters was studied: BMI, W:H ratio, HOMA-R, HOMA-beta and Pro12Al...

2015

Objective: Aim of this present study was to prepare and characterize the different polymorphs of Prulifloxacin using Powder X-Ray Diffraction analysis (PXRD), Scanning Electron Microscopy (SEM), Differential Scanning Calorimetry (DSC), Fourier Transform Infrared Spectrometry (FTIR) and dissolution studies. Methods: Polymorphs of Prulifloxacin were prepared by cooling crystallization method usin...

Journal: :British journal of industrial medicine 1987
R P Nolan A M Langer I Weisman G B Herson

Biological studies of two titanium dioxide polymorphs, rutile and anatase, have produced conflicting results. Generally, the in vivo and in vitro methods used to evaluate pneumoconiotic dusts have shown the polymorphs to be inert, but occasionally both minerals have been reported to produce effects consistent with biologically active minerals. Many of these reports failed to specify which polym...

Journal: :X-ray Structure Analysis Online 2009

Journal: :CrystEngComm 2021

High-pressure structural studies of claudetite I reveal that it exhibits the lowest As coordination numbers despite being densest As2O3polymorph.

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