| High pressure structural and vibrational properties of the spin-gap system Cu(2)PO(4)(OH). | |
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MedLine Citation:
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PMID: 23258210 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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The structural and vibrational properties of the spin-gapped system Cu(2)PO(4)(OH) have been investigated at room temperature under high pressure up to ∼20 GPa by Raman scattering and synchrotron-based x-ray diffraction and infrared (IR) spectroscopic measurements. The orthorhombic phase (space group Pnnm, z = 4) remains stable up to at least 7 GPa where it undergoes a weakly first order structural transition (with negligible volume drop) to a monoclinic phase (space group P2(1)/n, z = 4) with an abrupt monoclinic distortion. Refinement of atomic positions has been performed for the low pressure phase. The conspicuous changes in the vibrational spectra (Raman as well as far-IR) confirm this phase transition. At further higher pressures the monoclinic angle increases rapidly and the system transforms irreversibly into a disordered phase. Detailed vibrational analyses have been performed in the orthorhombic phase and pressure-induced structural evolution has been correlated with the vibrational modes corresponding to the Cu-O bonds. A strong negative pressure dependence of hydroxyl mode frequencies (as observed from the mid-IR absorption spectra) supports the pressure-induced structural disordering at higher pressures. |
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Authors:
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Pallavi S Malavi; S Karmakar; Debjani Karmakar; A K Mishra; H Bhatt; N N Patel; Surinder M Sharma |
Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-12-20 |
Journal Detail:
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Title: Journal of physics. Condensed matter : an Institute of Physics journal Volume: 25 ISSN: 1361-648X ISO Abbreviation: J Phys Condens Matter Publication Date: 2012 Dec |
Date Detail:
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Created Date: 2012-12-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 101165248 Medline TA: J Phys Condens Matter Country: - |
Other Details:
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Languages: ENG Pagination: 045402 Citation Subset: - |
Affiliation:
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High Pressure and Synchrotron Radiation Physics Division, Bhabha Atomic Research Centre, Trombay, Mumbai 400085, India. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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