Comparative temperature-dependent polarized Raman study of lithium potassium sulfate, sodium potassium sulfate, and the fast ion conductor lithium sodium sulfate.

The temperature dependence of the external modes not containing any significant lithium ion contribution were also investigated in LiNaSO(, 4), LiKSO(, 4), and NaK(, 3)(SO(, 4))(, 2). Modes containing sulfate ion rotational motion were found to be very temperature sensitive and were discussed in terms of their role in the phase transitions.Raman and infrared reflection spectra were used to assign internal and external modes in LiNaSO(, 4), LiKSO(, 4), and NaK(, 3)(SO(, 4))(, 2). Temperature-dependent Raman studies were performed on these vibrational modes.Modes due predominately to lithium ion motion in LiKSO(, 4) and LiNaSO(, 4) were identified through measurements in isotopically enriched (('6)Li) crystals and were studied in detail. Activation energies for lithium ion motion were calculated from the measured temperature dependence of the frequencies and bandwidths of the lithium ion modes.Internal mode temperature dependent Raman studies provided information concerning the sulfate sublattice as it undergoes the phase transition in the three sulfate systems

Fabrication of nanobaskets by sputter deposition on porous substrates and uses thereof

A method of producing a nanobasket and the applications or uses thereof. The method includes the steps of providing a substrate with at least one (1) pore having diameters of about one (1) nanometer to about ten (10) micrometers. Material is deposited by sputter-coating techniques along continuous edges of the pores to form a capped or partially capped nanotube or microtube structure, termed a nanobasket. Either a single material may be used to form nanobaskets over the pores or, alternately, a layered structure may be created wherein an initial material is deposited followed by one or more other materials to form nanobaskets over the pores

TEMPERATURE DEPENDENT RAMAN SPECTORSCOPY OF LIKSO4LIKSO_{4}

Author Institution:The polarized Raman spectra of single crystal $LiKSO_{4}$, which belongs to the hexagonal space group $C_{6}^{6} (P6_{3})$, were measured from room temperature to $725^{\circ} C$. The first order phase transition to an orthorhombic structure, variously reported from $435^{\circ} C$ to $445^{\circ} C$, is easily observed. Temperature dependent frequency and bandwidth data are discussed in terms of several models. Vibrational modes consisting primarily of the lithium sublattice motion exhibit unusual spectral behavior, broadening and essestially vanishing by $200^{\circ} C$