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Boström, T
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Publications (10 of 10) Show all publications
Boström, T., Jensen, J., Westin, G. & Wäckelgård, E. (2006). Accelerated ageing tests of optimized solution chemically derived selective solar thermal absorbers. In: : . Paper presented at Proceedings of Eurosun (2006) Glasgow, UK.
Open this publication in new window or tab >>Accelerated ageing tests of optimized solution chemically derived selective solar thermal absorbers
2006 (English)Conference paper, Published paper (Refereed)
National Category
Inorganic Chemistry Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-20203 (URN)
Conference
Proceedings of Eurosun (2006) Glasgow, UK
Available from: 2007-02-20 Created: 2007-02-20 Last updated: 2016-07-12
Boström, T., Jensen, J., Westin, G. & Wäckelgård, E. (2006). Proceedings of Eurosun 2006. In: : . Paper presented at Proceedings of Eurosun 2006.
Open this publication in new window or tab >>Proceedings of Eurosun 2006
2006 (English)Conference paper, Published paper (Refereed)
National Category
Engineering and Technology
Identifiers
urn:nbn:se:uu:diva-26577 (URN)
Conference
Proceedings of Eurosun 2006
Available from: 2007-02-22 Created: 2007-02-22 Last updated: 2016-07-12
Boström, T., Westin, G. & Wäckelgård, E. (2005). Durability tests of solution-chemically derived spectrally selective absorbers. Solar Energy Materials and Solar Cells, 89, 197-207
Open this publication in new window or tab >>Durability tests of solution-chemically derived spectrally selective absorbers
2005 (English)In: Solar Energy Materials and Solar Cells, Vol. 89, p. 197-207Article in journal (Refereed) Published
Abstract [en]

A detailed neutron powder diffraction and calorimetric study was conducted to determine the influence of increasing Mn-substitution on the crystal and the magnetic structures of hematite, α-Fe2O3. The study was initiated to determine, if Mn substitution may be responsible for unusual ferromagnetic properties of natural hematite samples from the Kalahari Mn field, South Africa. Natural as well as synthetic Mn-bearing hematite samples with the compositional range Fe2−xMnxO3 (x=0 to 0.176) were examined. Calorimetric measurements were performed to determine the Néel TN and the Morin TM temperature transitions. All studied hematite samples, irrespective of chemical composition, display weak ferromagnetism at 295 K and coexistence of weak ferromagnetic and antiferromagnetic phases at 10 K. A slight decrease of the total magnetic moment and TM but a drastic decrease of TN can be attributed to increasing Mn-substitution. The results illustrate that Mn substitution may contribute but cannot be the sole reason for the unusual magnetic properties of natural hematite samples.

Keywords
Hematite, Substitution, Neutron powder diffraction, Calorimetry, Magnetic structure
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-77649 (URN)
Note
Cu3N is a promising material for optical data storage and copper metallisation. Upon heating the metastable Cu3N decomposes into metallic copper and nitrogen gas. Films have been grown with a novel ALD (Atomic Layer Deposition) process using copper(II) hexafluoroacetylacetonate (Cu(hfac)2), water and ammonia as precursors. By adding an intermediate water pulse the growth rate was enhanced on oxide substrates. The water was used with the purpose of producing sacrificial oxide layers. The mass changes during the deposition cycles were measured by in-situ Quartz Crystal Microbalance (QCM) technique. Extensive hfac removal was observed during Cu(hfac)2 adsorption, yielding a surface composition of Cu(hfac) 0.4 (ad) for short pulses.Available from: 2006-03-21 Created: 2006-03-21 Last updated: 2011-01-11
Boström, T., Westin, G. & Wäckelgård, E. (2005). Experimental an theoretical optimization of a three layer solution chemically derived spectrally selective absorber. In: ISES 2005.
Open this publication in new window or tab >>Experimental an theoretical optimization of a three layer solution chemically derived spectrally selective absorber
2005 (English)In: ISES 2005, 2005Conference paper, Published paper (Other scientific)
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-77662 (URN)
Available from: 2006-03-21 Created: 2006-03-21
Boström, T., Westin, G. & Wäckelgård, E. (2005). Spectrally selective solar thermal absorber based on sol-gel and solution-chemistry methods. In: SOLGEL 2005.
Open this publication in new window or tab >>Spectrally selective solar thermal absorber based on sol-gel and solution-chemistry methods
2005 (English)In: SOLGEL 2005, 2005Conference paper, Published paper (Other (popular scientific, debate etc.))
Identifiers
urn:nbn:se:uu:diva-77657 (URN)
Available from: 2006-03-15 Created: 2006-03-15
Gelin, K., Boström, T. & Wäckelgård, E. (2005). Thermal emittance of sputter deposited infrared reflectors in spectrally selective tandem solar absorbers. Solar Energy, 77, 115-119
Open this publication in new window or tab >>Thermal emittance of sputter deposited infrared reflectors in spectrally selective tandem solar absorbers
2005 (English)In: Solar Energy, Vol. 77, p. 115-119Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-66950 (URN)
Available from: 2006-03-15 Created: 2006-03-15 Last updated: 2011-01-12
Boström, T. (2004). A New Generation of Spectrally Selective Solar Absorbers and Thermal Solar Systems. (Licentiate dissertation).
Open this publication in new window or tab >>A New Generation of Spectrally Selective Solar Absorbers and Thermal Solar Systems
2004 (English)Licentiate thesis, monograph (Other scientific)
Identifiers
urn:nbn:se:uu:diva-86118 (URN)
Available from: 2005-05-02 Created: 2005-05-02
Boström, T., Wäckelgård, E. & Westin, G. (2004). Anti-reflection coatings for solution-chemically derived nickel—alumina solar absorbers. Solar Energy Materials & Solar Cells (84), 183-191
Open this publication in new window or tab >>Anti-reflection coatings for solution-chemically derived nickel—alumina solar absorbers
2004 (English)In: Solar Energy Materials & Solar Cells, no 84, p. 183-191Article in journal (Refereed) Published
Abstract [en]

In order to suppress reflections from a solar absorber surface an anti-reflection (AR) layer is usually deposited on top of the solar absorbing coating. For the AR coating to function well it be made of a material with a lower refractive index than the underlying surface. Provided that the AR coating is sufficiently thin, it will not increase the thermal emittance value. Besides increasing the solar absorptance it is equally important that the AR layer is long term stable in order to create a successful solar selective coating. The objective was to create a highly efficient, flexible, inexpensive and durable AR coating for solar absorbers using simple techniques. Elastic properties are requested because it prohibits the formation of micro-cracks.

Mumina, silica and hybrid silica AR coatings were synthesized using solution chemistry and )l-gel techniques. The AR coatings were deposited on the absorber surface using spin

coating. The absorbers used without an AR layer had a normal solar absorptance of 0.79-0.81 and a normal thermal emittance of 0.03 The optimum anti-reflection coated sample acquired

a normal solar absorptance of 0.93 while the thermal emittance remained unaltered. The study has shown that by adding a proper AR coating to a solar absorber the spectral selectivity can be considerably enhanced.

Keywords
Anti-reflection, Absorber, Selective and thermal
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-67421 (URN)
Available from: 2007-04-17 Created: 2007-04-17 Last updated: 2011-01-12
Boström, T., Westin, G. & Wäckelgård, E. (2004). Antireflection coatings for solution-chemically derived nickel-alumina solar absorbers. Solar Energy Materials and Solar Cells, 84, 183-191
Open this publication in new window or tab >>Antireflection coatings for solution-chemically derived nickel-alumina solar absorbers
2004 (English)In: Solar Energy Materials and Solar Cells, Vol. 84, p. 183-191Article in journal (Refereed) Published
Identifiers
urn:nbn:se:uu:diva-66947 (URN)
Available from: 2005-05-02 Created: 2005-05-02 Last updated: 2011-01-12
Boström, T., Wäckelgård, E. & Westin, G. (2003). Solution-chemical derived nickel-alumina coatings for thermal solar absorbers. Solar Energy (74), 497-503
Open this publication in new window or tab >>Solution-chemical derived nickel-alumina coatings for thermal solar absorbers
2003 (English)In: Solar Energy, no 74, p. 497-503Article in journal (Refereed) Published
National Category
Inorganic Chemistry
Identifiers
urn:nbn:se:uu:diva-46216 (URN)
Available from: 2007-02-22 Created: 2007-02-22 Last updated: 2011-01-13
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