Polarized IR and Raman spectra of Ca"2MgSi"2O"7, Ca"2ZnSi"2O"7 and Sr"2MgSi"2O"7 single crystals: Temperature-dependent studies of commensurate to incommensurate and incommensurate to normal phase transitions

Jerzy Hanuza , Maciej Ptak , Mirosław Mączka , Jadwiga Lorenc , A. A. Kamiński


IR and Raman spectra of Ca2MgSi2O7, Ca2ZnSi2O7 and Sr2MgSi2O7 oriented single crystals and powders have been measured. The temperature dependence of phonons has been established in the 4–650 K range. Discussion of the results has been performed on the basis of factor group approach for the tetragonal P4̄21m (D2d3) space group with Z=2. The assignment of the bands observed to the internal and external modes has been made on their polarization behaviour, phonon energy calculations and literature data. The evidences of the LO–TO splitting and commensurate (C) to incommensurate (IC) as well as incommensurate (IC) to normal (N) phase transitions have been found. As a representative example, the results obtained for the spontaneous Raman scattering have also been used in the discussion of the stimulated Raman spectra of Ca2ZnSi2O7.
Author Jerzy Hanuza
Jerzy Hanuza,,
, Maciej Ptak - Institute of Low Temperatures and Structure Research Polish Academy of Sciences (INTiBS PAN) [Polish Academy of Sciences (PAN)]
Maciej Ptak,,
, Mirosław Mączka - Institute of Low Temperatures and Structure Research Polish Academy of Sciences (INTiBS PAN) [Polish Academy of Sciences (PAN)]
Mirosław Mączka,,
, Jadwiga Lorenc (EaE / IChaFT / DBCh)
Jadwiga Lorenc,,
- Department of Bioorganic Chemistry
, A. A. Kamiński
A. A. Kamiński,,
Journal seriesJournal of Solid State Chemistry, ISSN 0022-4596, (A 30 pkt)
Issue year2012
Keywords in EnglishCa2ZnSi2O7, Polarized IR and Raman spectra, Phonon calculation, LO–TO splitting, Phase transition, Stimulated Raman effect
ASJC Classification2505 Materials Chemistry; 1604 Inorganic Chemistry; 1606 Physical and Theoretical Chemistry; 3104 Condensed Matter Physics; 2503 Ceramics and Composites; 2504 Electronic, Optical and Magnetic Materials
Languageen angielski
Score (nominal)30
Score sourcejournalList
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2012 = 1.162; WoS Impact Factor: 2012 = 2.04 (2) - 2012=2.295 (5)
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