Optical Properties of Sb2Te3, and Dilute Magnetic Semiconductors Sb1.97 VO.03 Te3 and Sb1.94 CrO.06 Te3

This thesis reports on the optical properties of the dilute magnetic semiconductors, Sb1.97 V 0.03 Te3 and Sb1.94Cr0.06Te3, along with the parent compound Sb2Te3' These materials develop a ferromagnetic state at low temperature with Curie temperatures of 22 K and 16 K respectively. All three samples were oriented such that the electric field vector of the light was perpendicular to the c-axis. The reflectance profile of these samples in the mid-infrared (500 to 3000 cm-1) shows a pronounced plasma edge which retracts with decreasing temperature. The far-infrared region of these samples exhibits a phonon at ~ 60 cm-1 which softens as temperature decreases. Kramers-Kronig analysis and a Drude-Lorentz model were employed to determine the optical constants of the bulk samples. The real part of the optical conductivity is shown to consist of intraband contributions at frequencies below the energy gap (~0.26 eV) and interband contributions at frequencies above the energy gap. The temperature dependence of the scattering rate show that a mix of phonon and impurity scattering are present, while the signature of traditional spin disorder (magnetic) scattering was difficult to confirm.

The War, 9 February 1813 (vol. 1, no. 34) - Newspaper

Volumes of interest were published between 1812 and 1815 with articles about the War of 1812.

HG 34.70-34.85

Dark brown sediment with clasts that range from small to medium in size. The clasts were sub-angular to sub-rounded in shape. Lineations were abundant throughout the sample. It also contains some clay material and a few rotation structures.

GAO 34

Brown sediment with clasts ranging from small to large in a sandy matrix. Clast shape ranges from angular to rounded. The clasts are mainly well dispersed. Rotation structures are common in this sample, along with grain crushing. Some lineations can also be seen in this sample.

Certificate that Joseph Kingsmill, sheriff, has sold 3 ½ acres in Lot no. 34 in the 3rd Concession of Wainfleet to W. H. Dickson

Certificate that Joseph Kingsmill, sheriff, has sold 3 ½ acres in Lot no. 34 in the 3rd Concession of Wainfleet to W. H. Dickson, May 23, 1857.