%0 Journal Article %1 WOS:000458228200076 %A Silva, R X %A Almeida, R M %A Moreira, R L %A Paniago, R %A Rezende, M V S %A Paschoal, C W A %C THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND %D 2019 %I ELSEVIER SCI LTD %J CERAMICS INTERNATIONAL %K Double Infrared Magnetodielectrics; Microwave ceramics} perovskites; properties; spectroscopy; {Dielectric %N 4 %P 4756-4762 %R 10.1016/j.ceramint.2018.11.168 %T Vibrational properties and infrared dielectric features of Gd2CoMnO6 and Y2CoMnO6 double perovskites %V 45 %X Gd2CoMnO6 and Y2CoMnO6 double perovskite ceramics were obtained from the polymeric precursors method and investigated by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman and Fourier Transform Infrared (FTIR) spectroscopies. Our results show that these samples present similar structural and vibrational characteristics that are fully compatible with a monoclinic structure belonging to the P2(1)/n space group, with ordered Co2+ and Mn4+ cations. Infrared-reflectivity spectroscopy was employed to investigate the polar phonon features and to determine the intrinsic dielectric response of the materials. In particular, the extrapolated dielectric constants at the lower frequency infrared limit showed to be independent on the particle size, and were determined as epsilon'(intr)approximate to 17.8 and 16.0, for Gd2CoMnO6 and Y2CoMnO6, respectively. Otherwise, it is shown that for smaller RE radius the FTIR bands become more evidenced, due to a higher octahedral rotation and lower <Co-O-Mn> angle into the distorted monoclinic structure.

@article{WOS:000458228200076, abstract = {Gd2CoMnO6 and Y2CoMnO6 double perovskite ceramics were obtained from the polymeric precursors method and investigated by X-ray diffraction, X-ray photoelectron spectroscopy (XPS), scanning electron microscopy (SEM), Raman and Fourier Transform Infrared (FTIR) spectroscopies. Our results show that these samples present similar structural and vibrational characteristics that are fully compatible with a monoclinic structure belonging to the P2(1)/n space group, with ordered Co2+ and Mn4+ cations. Infrared-reflectivity spectroscopy was employed to investigate the polar phonon features and to determine the intrinsic dielectric response of the materials. In particular, the extrapolated dielectric constants at the lower frequency infrared limit showed to be independent on the particle size, and were determined as epsilon'(intr)approximate to 17.8 and 16.0, for Gd2CoMnO6 and Y2CoMnO6, respectively. Otherwise, it is shown that for smaller RE radius the FTIR bands become more evidenced, due to a higher octahedral rotation and lower <Co-O-Mn> angle into the distorted monoclinic structure.}, added-at = {2022-05-23T20:00:14.000+0200}, address = {THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, OXON, ENGLAND}, author = {Silva, R X and Almeida, R M and Moreira, R L and Paniago, R and Rezende, M V S and Paschoal, C W A}, biburl = {https://www.bibsonomy.org/bibtex/2ef6c0fbab31c85480e538a4c5a4d57d9/ppgfis_ufc_br}, doi = {10.1016/j.ceramint.2018.11.168}, interhash = {2dae28ebb2b2f64b99119835f584e795}, intrahash = {ef6c0fbab31c85480e538a4c5a4d57d9}, issn = {0272-8842}, journal = {CERAMICS INTERNATIONAL}, keywords = {Double Infrared Magnetodielectrics; Microwave ceramics} perovskites; properties; spectroscopy; {Dielectric}, number = 4, pages = {4756-4762}, publisher = {ELSEVIER SCI LTD}, pubstate = {published}, timestamp = {2022-05-23T20:00:14.000+0200}, title = {Vibrational properties and infrared dielectric features of Gd2CoMnO6 and Y2CoMnO6 double perovskites}, tppubtype = {article}, volume = 45, year = 2019 }