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Karen, Pavel; Kjekshus, Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1993)

Isovalent-substitution effect on the Verwey-type transition in the A-site-ordered double perovskite (Ba,Sr)RFe2O5

Nakamura, J; Karppinen, M; Karen, Pavel; Linden, J; Yamauchi, H (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2004)

Two types of chemical-pressure effects on the Verwey-type transition in Ba Sm Fe 2 O 5 are studied, viz., ionic-size contractions at the Ba and Sm sites. Whereas the replacement of Sm by the smaller Eu and Gd atoms increases ...

Neutron-powder-diffraction study of the nuclear and magnetic structures of the substitution compound (Y1−xCax)Ba2Fe3O8+d (x = 0.05, 0.10 and 0.20)

Natali-Sora, I.; Huang, Q.; Lynn, J.W.; Rosov, N.; Karen, Pavel; Kjekshus, Arne; Karen, V.L.; Mighell, A.D.; Santoro, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1994)

The nuclear and magnetic structures of ( Y 1 − x Ca x ) Ba 2 Fe 3 O 8 + δ with x=0.05, 0.10, and 0.20 have been investigated by neutron-powder diffraction at room temperature. The compound crystallizes with the symmetry ...

Superconducting and structural properties of Sr-substituted YBa2Cu4O8

Karen, Pavel; Kjekshus, Arne; Andresen, P.H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1992)

Low temperature methanol synthesis catalyzed by copper nanoparticles

Ahoba-Sam, Christian; Olsbye, Unni; Jens, Klaus-Joachim (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2018)

A one pot catalytic system which involves Cu and an alkoxide co-catalyst has been used for methanol (MeOH) synthesis at low temperature. Up to about 92% syngas conversion per pass and more than 90% selectivity to MeOH (the ...

Pressure effects on the charge-ordering transition of BaYCo2O5.0

Moritomo, Y; Hanawa, M; Xu, S; Ishikawa, H; Ohishi, Y; Kato, K; Honma, T; Karen, Pavel; Karppinen, M; Yamauchi, H (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 2004)

Pressure effects on the charge-ordering (CO) transition have been investigated for an oxygen-deficient double-perovskite cobalt oxide, BaYCo 2 O 5.0 , through resistivity measurements using a piston-cylinder-type clamp ...

On phase relations, structural and magnetic properties of the stable manganese carbides Mn23C6, Mn5C2 and Mn7C3

Karen, Pavel; Fjellvåg, Helmer; Kjekshus, Arne; Andresen, P.H. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1991)

Crystal structure of ScCl3

Fjellvåg, Helmer; Karen, Pavel (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1994)

Neutron-powder-diffraction study of the nuclear and magnetic structures of YBa2Fe3O8 at room temperature

Huang, Q.; Karen, Pavel; Karen, V.L.; Kjekshus, Arne; Lynn, J.W.; Mighell, A.D.; Rosov, N.; Santoro, A. (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1992)

The nuclear and magnetic structures of YBa 2 Fe 3 O 8 have been investigated by powder neutron diffraction at room temperature. The nuclear structure of the compound has the symmetry of space group P4/mmm and lattice ...

Substitution for copper in YBa2Cu3O9−d by 3d- and pre-transition metals

Andresen, P.H.; Fjellvåg, Helmer; Karen, Pavel; Kjekshus, Arne (Journal article / Tidsskriftartikkel / PublishedVersion; Peer reviewed, 1991)

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