| 1. |
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| 2. |
- Baron, V, et al.
(författare)
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Low-temperature neutron and x-ray diffraction studies on Mn(cth)Cu(oxpn)(CF3SO3)(2): (cth)=(+/-)-5,7,7,12,14,14-hexamethyl-1,4,8,11-tetraazacyclotetradecane; (oxpn)=N,N'-bis(3-aminopropyl)oxamide
- 1997
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Ingår i: ACTA CHEMICA SCANDINAVICA. - : MUNKSGAARD INT PUBL LTD. ; 51:6-7
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The present investigation shows the complementarity of neutron and X-ray diffraction studies. Neutron and X-ray diffraction experiments on a single crystal of Mn(cth)Cu(oxpn) (CF3SO3)(2) have been performed in order to study the nuclear structure and to
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| 3. |
- Baron, V, et al.
(författare)
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The influence of iron substitution on the magnetic properties of hausmannite, Mn2+(Fe,Mn)(2)(3+)O-4
- 1998
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Ingår i: AMERICAN MINERALOGIST. - : MINERALOGICAL SOC AMER. - 0003-004X. ; 83:7-8, s. 786-793
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Tidskriftsartikel (övrigt vetenskapligt/konstnärligt)abstract
- The occurrence of hausmannite with an apparent Curie temperature close to 750 K, instead of 41.8 K was recently described from hydrothermally altered manganese ore from the Kalahari manganese field, South Africa. The unusual magnetic properties were relat
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| 4. |
- Frantti, J, et al.
(författare)
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Neutron diffraction studies of Pb(ZrxTi1-x)O-3 ceramics
- 2000
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Ingår i: JAPANESE JOURNAL OF APPLIED PHYSICS PART 1-REGULAR PAPERS SHORT NOTES & REVIEW PAPERS. - : INST PURE APPLIED PHYSICS. - 0021-4922. ; 39:9B, s. 5697-5703
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Tidskriftsartikel (refereegranskat)abstract
- Neutron diffraction studies of lead zirconate titanate Pb(ZrxT1-x)O-3 (PZT) powders, 0.20 less than or equal to x less than or equal to 0.54, were carried out at 10 K and 297 K, The phase transition predicted by our earlier Raman observations (J. Frantti,
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| 5. |
- Granberg, H., et al.
(författare)
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Influence of surface-induced nonuniform reflectance on the diffuse reflectance factor. Part I : Model predictions
- 2003
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Ingår i: Journal of Pulp and Paper Science (JPPS). - 0826-6220. ; 29:8, s. 247-253
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Tidskriftsartikel (refereegranskat)abstract
- The Kubelka Munk (KM) model is used frequently as a tool to design paper to reach a desired opacity and whiteness. The input data in this modelling, the scattering and absorption coefficients, are commonly derived from diffuse reflectance factor measurements. The quality of the coefficient values is dependent on the structure of the samples and the backings from which they were obtained. In this paper we focus on modelling the influence of nonflectance factors obtained using the d/0degrees standardized uniform reflectance induced by the surface structure, and how it affects the diffuse reflectants factors obtained using the d/0degrees standardized measurement geometry. From the analysis, we conclude that the structure of the surface facing the detector may have a significant effect on the instrument readings depending on whether the sample is glossy or reflects diffusely from the surface. Based on this surface reflectance, we analyze various situations of relevance for the papermaker and show that common-practice application of the KM model to reflectance factor measurements may lead to serious misinterpretations.
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| 6. |
- Granberg, H., et al.
(författare)
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Influence of surface-inducled nonuniform reflectance on the diffuse reflectance factor. Part II : Experimental verification on coated substrates
- 2003
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Ingår i: Journal of Pulp and Paper Science (JPPS). - 0826-6220. ; 29:8, s. 254-259
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Tidskriftsartikel (refereegranskat)abstract
- Many authors have found that the Kubelka-Munk (KM) scattering coefficient, s(c), of a coating applied to a substrate decreases with increasing coat weight. This decrease is usually explained by a structural/porosity change with coating thickness or a penetration of the coating into the paper In this paper we propose an alternative explanation to the observed decrease in sc, namely the misinterpreted diffuse reflectance factors for non-Lambertian reflecting substrates and coatings. This explanation was recently proposed by the authors; the second part presented here provides experimental support for the presence of a nonuniform reflectance distribution and its influence on KM fitted data. Three different coated systems are considered, using a transparent film, abase paper and a synteape film as substrate. The effect of the surface reflectance of the substrate and of the coated substrate can explain the apparent decrease in sc as an artifact when measuring a sample with an instrument having a d/0degrees geometry.
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| 7. |
- MALETKA, K, et al.
(författare)
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HIGH-TEMPERATURE PHASE-TRANSITION IN NA2UI6 BY NEUTRON POWDER DIFFRACTION
- 1995
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Ingår i: SOLID STATE IONICS. - : ELSEVIER SCIENCE BV. ; 76:1-2
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The behaviour of Na2UI6 has been studied as a function of temperature by neutron powder diffraction. The neutron diffraction experiments carried out at 650 and 700 K, revealed a gradual rearrangement of the occupancy of the sodium atoms which tend - as t
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| 8. |
- Maletka, K, et al.
(författare)
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Neutron diffraction and electrical conductivity studies of Li2UI6 ionic conductor
- 1996
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Ingår i: SOLID STATE IONICS. - : ELSEVIER SCIENCE BV. ; 90:1-4
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The room and high temperature structures of Li2UI6 have been determined using the neutron powder diffraction. It has been shown that at 300 K, the compound crystallizes in trigonal unit cell with a = b = 7.3927(8), c = 13.826(2) Angstrom with space group
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| 9. |
- Maletka, K, et al.
(författare)
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Phase transitions in the ionic conductor Li2UBr6 studied by neutron diffraction
- 1998
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Ingår i: SOLID STATE IONICS. - : ELSEVIER SCIENCE BV. ; 106:1-2
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Annan publikation (övrigt vetenskapligt/konstnärligt)abstract
- The crystal structure of the Li2UBr6 ionic conductor has been studied as a function of the temperature by powder neutron diffraction. The room and high temperature structures have been determined. At 300 K the compound crystallises in a trigonal unit cel
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| 10. |
- Rundlof, M., et al.
(författare)
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The effect of dissolved and colloidal substances released from TMP on the properties of TMP fines
- 2000
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Ingår i: Nordic Pulp & Paper Research Journal. - : Walter de Gruyter GmbH. - 0283-2631 .- 2000-0669. ; 15:4, s. 256-265
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Tidskriftsartikel (refereegranskat)abstract
- An experimental method to manufacture a model white water from mechanical pulp by leaching of the pulp in distilled water is presented. This water, which contains dissolved and colloidal substances DCS, is fractionated into two fractions: a fraction which contains solely dissolved substances, DS, and a fraction enriched in colloidal particles, CS. The major part of the lipophilic extractives were found in the CS fraction and had a similar composition as the extractives in the non-fractionted water sample, the DS fraction contained no detectable amounts of neutral components and small amounts of fatty and resin acids. Galactoglucomannan was the dominating dissolved polysaccharide, Arabinose or Xylose were not detected in the water. The effect of these types of white water on the characteristics of TMP was studied by addition of different amounts to cationised TMP fines prior to sheet making. Fines were chosen as a model system because they are probably more susceptible to adsorption of DCS than coarser fractions, due to higher specific surface area. It was shown that water containing colloidal particles decreased the tensile strength of handsheets and that this decrease becomes more pronounced if the addition of colloial particles is increased. It is suggested that this decrease is linked to the amount of lipophilic extractives present on the surface of the fines and it is shown that the decrease begins to occur at a surface coverage of about 45%, as calculated from ESCA data. The tensile index was not affected by addtion of DS under the experimental conditions used. The light absorption coefficent of the sheets increased upon addition of all water fractions, which indicates that the dissolved substances are an important reason for the observed darker colour.
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