| 1. |
- Ahmed, Istaq, 1972, et al.
(författare)
-
Structural study and proton conductivity of BaZr0.90Ga0.10O2.95
- 2006
-
Ingår i: Advances of Solid Oxide Fuel Cells II, Ceramic Engineering and Science Proceedings. - Hoboken, NJ, USA : John Wiley & Sons, Inc.. ; 27:4, s. 105-117
-
Tidskriftsartikel (refereegranskat)abstract
- Traditional solid state sintering has been used to prepare the perovskite BaZr0.9Ga0.1O2.95. Analysis of X-ray powder diffraction data shows that a decrease of the unit cell parameter a was observed compared to the undoped BaZrO3, which confirms successful substitution of Ga3+ for Zr4+ at the B site. Rietveld analysis of room temperature neutron powder diffraction data confirmed cubic symmetry (space group Pm-3m) for both as- prepared and deuterated BaZr0.90Ga0.10O2.95 samples. The strong O-H stretch band (2500-3500 cm−1) in the infrared absorbance spectrum clearly manifests the presence of protons in the pre-hydrated material. The bulk and total conductivities of prehydrated BaZr0.9Ga0.1O2.95 are 1.17 × 10−5 and 3.55 × 10−6 Scm−1, respectively at 400°C, which are more than one order of magnitude higher than for dried a sample at the same temperature. In contrast, the total conductivity of pre-hydrated and dried samples is similar at higher temperature, e. g. T > 800 °C. The higher activation energy (e. g. 0.7 eV) for pre-hydrated sample compared to typical value (0.4-0.5 eV) of proton conduction may suggest that the protons are trapped in the material.
|
|
| 2. |
- Matic, A., Börjesson, L., Monaco, G., Engberg, D. and Masciovecchio, C.
(författare)
-
Acoustic modes in the network glass Li2O-2B2O3, new evidence from inelastic x-ray scattering.
- 2002
-
Ingår i: Philosphical Magazine. ; 82:2, s. 243-249
-
Tidskriftsartikel (refereegranskat)
|
|
| 3. |
|
|
| 4. |
- Åkesson, Dan, et al.
(författare)
-
Synthesis and characterization of a lactic acid-based thermoset resin suitable for structural composites and coatings
- 2009
-
Ingår i: Journal of Applied Polymer Science. - : John Wiley & Sons, Inc.. - 0021-8995 .- 1097-4628. ; 115:1, s. 480-486
-
Tidskriftsartikel (refereegranskat)abstract
- A new biobased polyester resin was developed for thermoset composite applications. The resin is potentially inexpensive and can be produced industrially by relatively simple means. The resin consists of star-shaped methacrylated oligomers of lactic acid (LA). LA oligomers were synthesized in a two-step process: in the first step, oligomers of LA were polymerized by direct condensation of LA. In the second step, the oligomers were end-functionalized by methacrylic anhydride. The resin was characterized by differential scanning calorimetry, Raman spectroscopy, NMR, rubber process analyzer, and TOF-SIMS. Tests show that the resin can be crosslinked into a rigid network within a couple of minutes upon thermal initiation. (C) 2009 Wiley Periodicals, Inc. J Appl Polym Sci 115: 480-486, 2010
|
|
