کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
9837368 1525274 2005 6 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Raman scattering studies on mercuric iodide at high pressures and at low temperatures
موضوعات مرتبط
مهندسی و علوم پایه فیزیک و نجوم فیزیک ماده چگال
پیش نمایش صفحه اول مقاله
Raman scattering studies on mercuric iodide at high pressures and at low temperatures
چکیده انگلیسی
Raman scattering measurements have been performed on single crystal red mercuric iodide under high-pressures up to ∼5.5 GPa and at low-temperatures down to 40 K. Our low-temperature measurements help clarify the issues related to the accidental degeneracy of the Eg1 and B1g2 modes in the tetragonal phase. Raman modes stiffen and their widths reduce with the lowering of the temperature. All the Raman active mode frequencies increase with pressure up to 1.3 GPa, beyond which the modes of the tetragonal phase disappear and new modes appear supporting the earlier reported red → high-pressure yellow structural transition at this pressure. Knowledge of both temperature and pressure dependences has allowed us to separate, for all the Raman active modes, the explicit phonon-excitation contribution and the implicit volume-driven contribution to the observed temperature coefficient dω/dT for both the phases.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Physica B: Condensed Matter - Volume 369, Issues 1–4, 1 December 2005, Pages 287-292
نویسندگان
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