6 research outputs found
Ferromagnetic-like behavior of Bi0.9La0.1FeO3-KBr nanocomposites
We studied magnetostatic response of the Bi0.9La0.1FeO3-KBr composites
(BLFO-KBr) consisting of nanosized (about 100 nm) ferrite Bi0.9La0.1FeO3 (BLFO)
conjugated with fine grinded ionic conducting KBr. When the fraction of KBr is
rather small (less than 15 wt percent) the magnetic response of the composite
is very weak and similar to that observed for the BLFO (pure KBr matrix without
Bi1-xLaxFeO3 has no magnetic response as anticipated). However, when the
fraction of KBr increases above 15percent, the magnetic response of the
composite changes substantially and the field dependence of magnetization
reveals ferromagnetic-like hysteresis loop with a remanent magnetization about
0.14 emu/g and coercive field about 1.8 Tesla (at room temperature). Nothing
similar to the ferromagnetic-like hysteresis loop can be observed in BLFO
ceramics, which magnetization quasi linearly increases with magnetic field.
Different physical mechanisms were considered to explain the unusual
experimental results for BLFO-KBr nanocomposites, but only those among them,
which are highly sensitive to the interaction of antiferromagnetic
Bi0.9La0.1FeO3 with ionic conductor KBr, can be relevant. An appropriate
mechanism turned out to be ferro-magneto-ionic coupling.Comment: 24 pages, 4 figures in the main text, and supplement with 4 figure
Modification of Adhesive Compositions Based on Polar Rubbers with Oligomeric Unsaturated Polyketone
ΠΠΎΠΊΠ°Π·Π°Π½Π° ΡΡΡΠ΅ΠΊΡΠΈΠ²Π½ΠΎΡΡΡ ΠΏΡΠΈΠΌΠ΅Π½Π΅Π½ΠΈΡ ΠΎΠ»ΠΈΠ³ΠΎΠΌΠ΅ΡΠ½ΠΎΠ³ΠΎ Π½Π΅Π½Π°ΡΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΠΈΠΊΠ΅ΡΠΎΠ½Π°,
ΠΏΠΎΠ»ΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΏΡΡΠ΅ΠΌ ΡΠ΅Π°ΠΊΡΠΈΠΈ ΡΠΈΡβ1,4-Π±ΡΡΠ°Π΄ΠΈΠ΅Π½ΠΎΠ²ΠΎΠ³ΠΎ ΠΊΠ°ΡΡΡΠΊΠ° Ρ ΠΎΠΊΡΠΈΠ΄ΠΎΠΌ Π°Π·ΠΎΡΠ° (I) (N 2O), Π΄Π»Ρ
ΠΌΠΎΠ΄ΠΈΡΠΈΠΊΠ°ΡΠΈΠΈ ΠΊΠ»Π΅Π΅Π²ΡΡ
ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΉ Π½Π° ΠΎΡΠ½ΠΎΠ²Π΅ Ρ
Π»ΠΎΡΠΎΠΏΡΠ΅Π½ΠΎΠ²ΠΎΠ³ΠΎ ΠΊΠ°ΡΡΡΠΊΠ° PSβ40A ΠΈ Π±ΡΡΠ°Π΄ΠΈΠ΅Π½-Π½ΠΈΡΡΠΈΠ»ΡΠ½ΠΎΠ³ΠΎ
ΠΊΠ°ΡΠ±ΠΎΠΊΡΠΈΠ»Π°ΡΠ½ΠΎΠ³ΠΎ ΠΊΠ°ΡΡΡΠΊΠ° Π‘ΠΠβ26β5. Π£ΡΡΠ°Π½ΠΎΠ²Π»Π΅Π½ΠΎ, ΡΡΠΎ Π²Π²Π΅Π΄Π΅Π½ΠΈΠ΅ Π² ΠΊΠΎΠΌΠΏΠΎΠ·ΠΈΡΠΈΠΈ
ΠΎΠ»ΠΈΠ³ΠΎΠΌΠ΅ΡΠ½ΠΎΠ³ΠΎ Π½Π΅Π½Π°ΡΡΡΠ΅Π½Π½ΠΎΠ³ΠΎ ΠΏΠΎΠ»ΠΈΠΊΠ΅ΡΠΎΠ½Π°, ΡΠΎΠ΄Π΅ΡΠΆΠ°ΡΠ΅Π³ΠΎ 9,7 ΠΌΠ°ΡΡ.% ΠΊΠΈΡΠ»ΠΎΡΠΎΠ΄Π° Π² Π²ΠΈΠ΄Π΅ ΠΊΠ°ΡΠ±ΠΎΠ½ΠΈΠ»ΡΠ½ΡΡ
Π³ΡΡΠΏΠΏ, ΠΏΡΠΈΠ²ΠΎΠ΄ΠΈΡ ΠΊ ΠΏΠΎΠ²ΡΡΠ΅Π½ΠΈΡ ΠΏΡΠΎΡΠ½ΠΎΡΡΠΈ ΡΠΊΠ»Π΅ΠΈΠ²Π°Π½ΠΈΡ ΠΎΠ±ΡΠ°Π·ΡΠΎΠ² Π²ΡΠ»ΠΊΠ°Π½ΠΈΠ·Π°Ρ-ΡΠ΅ΡΠΌΠΎΠΏΠ»Π°ΡΡ
ΠΈ Π²ΡΠ»ΠΊΠ°Π½ΠΈΠ·Π°Ρ-Π²ΡΠ»ΠΊΠ°Π½ΠΈΠ·Π°ΡThe effectiveness of the use of oligomeric unsaturated polyketone obtained by the reaction of cisβ1,4-butadiene rubber with nitric oxide (I) (N 2O) for modification of adhesive compositions based on chloroprene rubber PSβ40A and nitrile butadiene carboxylate rubber SKNβ26β5 is shown. It was found that the introduction of oligomeric unsaturated polyketone containing 9.7 wt.% oxygen in the form of carbonyl groups into the composition leads to an increase in the adhesion strength of the vulcanizate- βthermoplastic and vulcanizate- vulcanizate sample