Disorder and Order in Strongly Nonstoichiometric Compounds

Гусев, А. И.; Rempel, A. A.; Magerl, A.

doi:10.1007/978-3-662-04582-4

Cited by 245 publications

(84 citation statements)

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“…While the notion of an interface with a negative energy is at the first glance paradoxical, similar concepts were previously used for description of incommensurate ferroic phases [37][38][39][40][41] , intercalation compounds 42,43 , crystallographic shear phases 44 and charge density waves. Essentially, an intrinsic wall instability predicts transition to the modulated phase where interfaces are uniformly distributed in space (that is, emergence of the long-range modulated phase as the thermodynamic ground state of the system), as opposed to formation of two-phase mixtures [45][46][47] .…”

Section: Discussionmentioning

confidence: 99%

Atomic-scale evolution of modulated phases at the ferroelectric–antiferroelectric morphotropic phase boundary controlled by flexoelectric interaction

Borisevich

Eliseev

Morozovska³

et al. 2012

Nat Commun

153

118

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Section: Discussionmentioning

confidence: 99%

Atomic-scale evolution of modulated phases at the ferroelectric–antiferroelectric morphotropic phase boundary controlled by flexoelectric interaction

Borisevich

Eliseev

Morozovska³

et al. 2012

Nat Commun

153

118

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“…We see that disorder changes the magnon-DOS very drastically in particular for low energy excitations ( Fig. 7(b)) which are decisive for the resulting values of the Curie temperature [3,7].…”

Section: Discussion and Summarymentioning

confidence: 84%

Disordered correlated Kondo-lattice model

Bryksa

Nolting

2008

Journal of Magnetism and Magnetic Materials

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We propose a self-consistent approximate solution of the disordered Kondo-lattice model (KLM) to get the interconnected electronic and magnetic properties of 'local-moment' systems like diluted ferromagnetic semiconductors. Aiming at (A 1−x M x ) compounds, where magnetic (M) and nonmagnetic (A) atoms distributed randomly over a crystal lattice, we present a theory which treats the subsystems of itinerant charge carriers and localized magnetic moments in a homologous manner.The coupling between the localized moments due to the itinerant electrons (holes) is treated by a modified RKKY-theory which maps the KLM onto an effective Heisenberg model. The exchange integrals turn out to be functionals of the electronic selfenergy guaranteeing selfconsistency of our theory. The disordered electronic and magnetic moment systems are both treated by CPA-type methods.We discuss in detail the dependencies of the key-terms such as the long range and oscillating effectice exchange integrals, 'the local-moment' magnetization, the electron spin polarization, the Curie temperature as well as the electronic and magnonic quasiparticle densities of states on the concentration x of magnetic ions, the carrier concentration n, the exchange coupling J, and the temperature. The shape and the effective range of the exchange integrals turn out to be strongly x-dependent. The disorder causes anomalies in the spin spectrum especially in the low-dilution regime, which are not observed in the mean field approximation.

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“…However, its peak intensity drastically decreased in high temperature casting alloys, using chemically bonded sand. This was noticed for furan waste sand casting high chrome (diffraction 3) and alkaline phenolic sand for steel (Diffraction pattern 5) and could be attributed to crystallographic metamorphose of SiO2 from trigonal to cubic, which leads to difference intensities of these superstructure reflection [18]. While, in the case of greensand samples casting grey iron (diffraction 3) and cast iron (diffraction 6), the low intensity of the silica peak is associated to the new mineralised phases acting as impurities therefore, lowering the SiO2 peak intensity.…”

Section: Mineralogical Characterization (X-ray Diffraction)mentioning

confidence: 84%

Physico-Chemical Characterization of South African Waste Moulding Sands

Nyembwe

Makhatha

Madzivhandila

2016

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Abstract. Dry analysis techniques including X-ray fluorescence (XRF), X-ray diffraction (XRD), Scanning Electron Microscope (SEM-EDS) and Fourier Transform Infra-red (FTIR) have been used to assess the Physico-chemical of waste sand samples, obtained from different local foundry. The casting process involved included Aluminum in shell sand, brass under alky urethane, grey iron in greensand moulding, high chrome using furan sand, steel casting in alkaline phenolic and lastly cast iron from greensand mould.The study revealed the transformations and changes which have taken place in the waste sand due to the casting process, in terms of chemical composition, mineralogy, morphology and bonding types. The study demonstrated that the waste sand after the casting process was a completely new material, compared to the original virgin sand used for moulding process.

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Disorder and Order in Strongly Nonstoichiometric Compounds

Cited by 245 publications

References 0 publications

Atomic-scale evolution of modulated phases at the ferroelectric–antiferroelectric morphotropic phase boundary controlled by flexoelectric interaction

Atomic-scale evolution of modulated phases at the ferroelectric–antiferroelectric morphotropic phase boundary controlled by flexoelectric interaction

Disordered correlated Kondo-lattice model

Physico-Chemical Characterization of South African Waste Moulding Sands

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