Far-Infrared Reflectance and Transmittance of Potassium Magnesium Fluoride and Magnesium Fluoride

Abstract

The room-temperature transmittance of KMgF 3 and MgF 2 have been measured from 800 to 70 cm" 1 . Reflectance measurements were made over a wider range in the far infrared and the data have been analyzed using the Kramers-Kronig relationship to obtain the dielectric dispersion of these materials. Three resonances were observed for KMgF 3 and four were observed for MgF 2 as required by standard group theory and these have been related to presumed normal modes of vibration of the crystals.

Synthesis and characterization of crystalline nanosized MgF2 powder via microemulsion route

“…4 was assigned to the Mg-F stretching vibration of MgF 2 . Other researchers have assigned a broader band at 435 cm À1 to the stretching vibration of Mg-F [24,25]. Although the synthesized MgF 2 was washed several times with the mixture of methanol and water, the characteristic bands of the remaining surfactant groups were observed in the FT-IR spectrum.…”

Excellent fluoride removal properties of porous hollow MgO microspheres

“…At the same time, a new FTIR peak at 503 cm À1 was formed, which was very close to the range of Mg-F stretching vibration. 48 The observed Mg-F stretching vibration wavenumber was higher than that of MgF 2 (435-470 cm À1 ), [48][49][50][51] and lower than that of Mg-F stretching vibration of fluoride containing phthalocyaninato complexes located at 538 cm À1 . 52 However, the reported Mg-F stretching vibration of MgF 2 also has a strong shoulder peak at 550 cm À1 .…”

DETERMINATION OF THE CRYSTAL STRUCTURE OF ERBIUM TITANATE, Er2Ti2O7, BY X-RAY AND NEUTRON DIFFRACTION

“…I t seems to be generally agreed that Last's assignment of the highest-frequency band in BaTi03 t o a Ti-0 stretching vibration, v l , is correct. His assignemnt of the lowerfrequency (T) band to a Ti-0-Ti bending mode, v2, has been the subject of some discussion (29,30,31), b u t recent detailed studies and K-K analyses of the spectra of titanate perovsltites (32), and comparison of the spectra of BaTi03 and rutile with the spectra of the corresponding model structures KMgF3 and MgF2 (33,34), indicate t h a t neither v l nor v2 are affected by the nature of the heavy cation and that vz indeed is a bending mode of the TiOG octahedron. A similar situation exists in rutile.…”