Effect of Particle Size and Shape on the Infrared Absorption of Magnesium Oxide Powders

Luxon, James T.; Montgomery, D. J.; Summitt, Robert

doi:10.1103/physrev.188.1345

Cited by 74 publications

(28 citation statements)

References 9 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…9,20-22 Surface modes in MgO particles also influence the total absorption band and thus bring rich phenomena to the optical properties of the MgO small particles. 9,[21][22][23][24][25] As depicted by FTIR measurement in Figure 4, the observed resonance mode at 16.20 THz (540 cm -1 ) in the MgO nanocrystals is in good agreement with the previous reports by Bohern 9 and Hayashi, 21 which is well-known as a surface mode in the MgO particles associated with the phonon mode TO(Γ) around 12.03 THz (401 cm -1 ). According to theoretical treatment, 9 the frequency of the surface mode ω S in the MgO particles can be estimated from the following relationship:…”

Section: Resultssupporting

confidence: 92%

Terahertz Dielectric Properties of MgO Nanocrystals

et al. 2008

View full text Add to dashboard Cite

Terahertz properties of chemically synthesized MgO nanocrystals are studied by terahertz time-domain spectroscopy in the frequency range extending up to 3.7 THz. The experimentally determined optical and dielectric properties of the nanocrystalline MgO are compared with those of a bulk MgO single crystal. Three prominent resonance modes, which are essentially responsible for the dielectric properties of the nanostructured MgO in the terahertz regime, are characterized at ω 1 /(2π) ) 4.26 THz, ω 2 /(2π) ) 7.68 THz, and ω 3 /(2π) ) 12.18 THz and are well-described by a multiple-oscillator model through theoretical fitting. The MgO nanocrystals may find intriguing applications in developing terahertz quasi-optic components and terahertz spectroscopy.

show abstract

Section: Resultssupporting

confidence: 92%

Terahertz Dielectric Properties of MgO Nanocrystals

et al. 2008

View full text Add to dashboard Cite

show abstract

“…Figures 3 and 4 Now let us look at the origin of these FIR platform peaks of samples A and B. The appearance of the low-frequency FIR platform peaks brings to mind the results reported by Fuchs et al, 22 Yamamoto et al, 23 Ruppin et al, 24,25 and Luxon et al, 26 who have observed low-frequency FIR platform peaks resulting from the surface modes of cylindrical and spheroid particles. These pioneers have theoretically and experimentally studied these FIR platform peaks.…”

Section: Far-infrared Absorption Spectra and Properties Of Sno 2 Nanomentioning

confidence: 83%

Far-infrared absorption spectra and properties of SnO2 nanorods

Liu

Dong

Wang

2003

Applied Physics Letters

View full text Add to dashboard Cite

Gray-colored materials synthesized by calcining the precursor powders, which were produced in a microemulsion, are identified to be rutile structured SnO2 nanorods 20–45 nm in diameter and several micrometers in length by x-ray diffraction, transmission with electron microscopy, and high-resolution transmission microscopy. Conspicuous far-infrared (FIR) absorption spectrum platform peaks with widths of up to 61.6 and 119 cm−1 are observed, and are explained as the overlap of the surface modes of cylindrical and spheroid particles. Good agreement is achieved between FIR platform peaks and calculated results.

show abstract

“…However, low specific surface area ranging between 5 and 12 m 2 g À 1 and a broad and bimodal size distribution with few particles of almost micrometric size represent a weak point of this type of MgO synthesis [26][27][28][29]. An anomaly in MgO smoke infrared absorption properties was assigned to an extremely asymmetric size distribution in which less than 1% of the particles account for more than 50% of the mass [30]. According to Altman et al [31], such an asymmetry is due to different residence times of MgO particles within the flame since the PSD shifts toward larger sizes and broadens when the collection height increases .…”

Section: Introductionmentioning

confidence: 98%