Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu2(OH)2CO3

Janod, Étienne; Leonyuk, L.; Maltsev, V.

doi:10.1016/s0038-1098(00)00365-3

Cited by 17 publications

(23 citation statements)

References 16 publications

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“…Routine elemental analysis techniques, such as X-ray fluorescence spectroscopy (XRF), cannot distinguish between the two types of Cu. On the contrary, BCC is an antiferromagnetic material (Janod et al 2000), whereas the Cu-wood complexes formed in the wood after treatment contain paramagnetic cupric ions (Hughes et al 1994;Xie et al 1995). The differing magnetic behavior of the two Cu species enables the determination of the mobilized and chemically fixed cupric ions by means of electron paramagnetic resonance (EPR) spectroscopy (Xue et al 2010(Xue et al , 2012.…”

Section: Introductionmentioning

confidence: 99%

Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy

2013

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Sapwood sawdust from southern pine was treated with micronized copper (MC) under various conditions and the mobilized copper(II) (Cu mob ) concentrations were determined in the treated wood by electron paramagnetic resonance (EPR) spectroscopy. The spectral parameters for the copper sulfate (CuSO 4 )-treated sapwood and those of the MC-treated sapwood were very similar. A linear correlation was found between the intensities of copper (Cu) EPR spectra and those of Cu energydispersive X-ray fluorescence spectroscopy in a series of CuSO 4 -treated sapwood reference samples. Thus, the EPR signal intensities could be reliably correlated to the mass of reacted Cu present using this calibration curve. The amount of the Cu mob in sawdust treated by MC suspensions increased during the first 2-3 days after the initial treatment and then reached a maximum during the 7-day monitoring period. In the case of the treatment with MC alone or MC azole, an increased MC concentration led to an elevated amount of Cu (to a maximum of ∼0.23% Cu) solubilized by the sapwood. If the wood was treated with MC quat, the Cu mob initially increased, but at higher concentrations the Cu mob content decreased, due to the interference by the quat cobiocide on the acid reaction between the wood and the basic Cu carbonate. An examination of commercially-treated wood confirmed the laboratory observations.

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Section: Introductionmentioning

confidence: 99%

Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy

2013

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“…The polar collagen is believed to act with the inorganic materials to produce an ordered composite structure, which then gives rise to the formation of a strong (intrinsic) permanent dipole. Recently, it has been reported that natural mineral Cu 2 (OH) 2 CO 3 possesses magnetic properties, since it exhibits a quantum spin liquid ground state, consistent with its structure which includes s ¼ 1 2 alternating chain with rather low inter-chain coupling [34]. In Cu 2 (OH) 2 CO 3 , the magnetic coupling originates from the Cu-O-Cu superexchange.…”

Section: Article In Pressmentioning

confidence: 76%

“…The main parameters affecting the strength and the sign of superexchange are the Cu-O distance, the Cu-O-Cu angle and the crystal structure via the Madelung potential [35]. The Anderson-Kanamori-Goodenough rules [36] state that the Cu-O-Cu superexchange is the sum of a weak angle independent ferromagnetic coupling and of a strong antiferromagnetic coupling maximum for j ¼ 180 and approaching zero at 90 [34]. These facts suggest that the formation of peanut-like malachite bundles may also be related to its intrinsic electric fields of the belt-like structures, which may maximize the antiferromagnetic coupling [37].…”

Section: Article In Pressmentioning

confidence: 99%

Peanut-shaped nanoribbon bundle superstructures of malachite and copper oxide

Zhang

et al. 2004

Journal of Crystal Growth

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“…The spectra do not show any features of significance. The pattern of the sawdust control is due to radical formed during grinding, whereas basic CuCO 3 is antiferromagnetic in its solid state (Janod et al 2000 ) and hence " EPR-silent " (the small multiplet signal at 3350 G is due to an impurity in boron nitride). From the spectrum recorded within 2 h after the initial treatment, it is clear that the suspension of basic CuCO 3 reacts quickly with wood.…”

Section: Epr Spectra Of Sawdust Treated With Basic Cuco 3 Suspensionsmentioning

confidence: 99%

Investigation of copper solubilization and reaction in micronized copper treated wood by electron paramagnetic resonance (EPR) spectroscopy

2012

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The purpose of this study was to compare the reaction chemistry of micronized copper and alkaline copper treatments with wood and to determine how fast copper is solubilized during the reaction between the acidic functionality in wood and the basic copper carbonate (CuCO 3 ). Copper species produced in wood by various treatment methods were analyzed by electron paramagnetic resonance (EPR) spectroscopy. The effects of time and solution concentration on the spectral parameters of copper complexes in sawdust treated with copper sulfate solutions were examined, followed by study on the structure and the rate of formation of the copper complexes in sawdust treated with basic CuCO 3 suspension. The study further attempted to identify the soluble copper species formed in wood during treatment with micronized copper preservatives. Comparisons were made among the fi xed copper complexes in wood treated with micronized copper preservatives, copper sulfate solutions, basic CuCO 3 suspensions and alkaline copper solution. The results showed rapid formation of fi xed copper complexes in wood treated with aqueous suspensions of basic CuCO 3 . These complexes can resist leaching, and they have similar stereochemistry to those formed between wood and copper sulfate. This fi nding supports the premises that soluble copper is generated during the treatment of sawdust with basic CuCO 3 , and it can bond to wood cell components by migrating into the cell wall in a manner similar to other soluble copper species. Such copper complexes formed are different from those of alkaline copper treated wood, which can be easily distinguished by EPR.

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Experimental evidence for a spin gap in the s=1/2 quantum antiferromagnet Cu2(OH)2CO3

Cited by 17 publications

References 16 publications

Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy

Quantification of mobilized copper(II) levels in micronized copper-treated wood by electron paramagnetic resonance (EPR) spectroscopy

Peanut-shaped nanoribbon bundle superstructures of malachite and copper oxide

Investigation of copper solubilization and reaction in micronized copper treated wood by electron paramagnetic resonance (EPR) spectroscopy

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