%0 Journal Article %1 WOS:000536182700013 %A Silva, R X %A Silva, A %A Moreira, R L %A Almeida, R M %A Paschoal, C W A %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND %D 2020 %I PERGAMON-ELSEVIER SCIENCE LTD %J MATERIALS RESEARCH BULLETIN %K Dielectric Double Infrared Structural perovskites; phase properties; spectroscopy; transition} {La2CoMnO6; %R 10.1016/j.materresbull.2020.110878 %T High-temperature structural phase transition and infrared dielectric features of La2CoMnO6 %V 129 %X In this paper, we present the temperature-dependent far-infrared reflectivity spectra of partially ordered magnetodielectric La2CoMnO6 from room temperature to 673 K. We demonstrate a clear first-order structural phase transition (SPT) from a monoclinic structure with P2(1)/n symmetry to a rhombohedral phase with R (3) over bar symmetry from the behavior of the polar phonon modes at T-c similar to 590 K. The temperature-dependent transversal and longitudinal phonon branches, dielectric strengths, and damping of the strongest dielectric modes support the significant contribution of the phonon modes to the SPT and reveal an important lattice anharmonicity, especially for the low-frequency modes. Also, these investigations showed that structural ordering does not inhibit the SPT and provided valuable information regarding the polar phonons and their effects on the intrinsic dielectric constant in double perovskites and related compounds.

@article{WOS:000536182700013, abstract = {In this paper, we present the temperature-dependent far-infrared reflectivity spectra of partially ordered magnetodielectric La2CoMnO6 from room temperature to 673 K. We demonstrate a clear first-order structural phase transition (SPT) from a monoclinic structure with P2(1)/n symmetry to a rhombohedral phase with R (3) over bar symmetry from the behavior of the polar phonon modes at T-c similar to 590 K. The temperature-dependent transversal and longitudinal phonon branches, dielectric strengths, and damping of the strongest dielectric modes support the significant contribution of the phonon modes to the SPT and reveal an important lattice anharmonicity, especially for the low-frequency modes. Also, these investigations showed that structural ordering does not inhibit the SPT and provided valuable information regarding the polar phonons and their effects on the intrinsic dielectric constant in double perovskites and related compounds.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND}, author = {Silva, R X and Silva, A and Moreira, R L and Almeida, R M and Paschoal, C W A}, biburl = {https://www.bibsonomy.org/bibtex/2cd4514553402a7a7bfb3d6adb1347357/ppgfis_ufc_br}, doi = {10.1016/j.materresbull.2020.110878}, interhash = {928ebe1cc25d95a585099ffd65dc68ae}, intrahash = {cd4514553402a7a7bfb3d6adb1347357}, issn = {0025-5408}, journal = {MATERIALS RESEARCH BULLETIN}, keywords = {Dielectric Double Infrared Structural perovskites; phase properties; spectroscopy; transition} {La2CoMnO6;}, publisher = {PERGAMON-ELSEVIER SCIENCE LTD}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {High-temperature structural phase transition and infrared dielectric features of La2CoMnO6}, tppubtype = {article}, volume = 129, year = 2020 }