Synthesis and properties of mullite-type (Bi1−xSrx)2(M11−yM2y)4O9−x (M=Al, Ga, Fe)

Gesing, Thorsten M.; Fischer, R. X.; Burianek, Manfred; Mühlberg, M.; Debnath, Tapas; Rüscher, Claus H.; Ottinger, Jan; Buhl, Josef‐Christian; Schneider, Hartmut

doi:10.1016/j.jeurceramsoc.2011.04.004

Cited by 45 publications

(22 citation statements)

References 15 publications

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“…The single‐crystal data of Yin et al for the b ‐direction exhibit a conductivity activation energy of only 0.225 eV . Along with the fact that their dc‐conductivity is about three times larger than our results, which might be regarded as another indication that their crystal might contain a larger number of defects (it is well known for the mullite‐type compounds that the conductivity is low but minor amounts of additional Bi 2 O 3 increase the conductivity significantly).…”

Section: Resultscontrasting

confidence: 41%

Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Ziegler

Köhler

Gibhardt

et al. 2019

Physica Status Solidi (b)

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The low-temperature behavior of single-crystalline Bi 2 Mn 4 O 10 is studied using dielectric impedance spectroscopy and inelastic neutron scattering. Several relaxation processes with pronounced anisotropic character can be identified in the frequency range between 1 Hz and 1 MHz for temperatures between 150 and 300 K. The dielectric as well as the mechanical properties are demonstrated close to the anti-ferromagnetic transition. The static dielectric permittivity yields a small but well-defined peak at the N eel temperature of (38.3 AE 0.1) K, which is related to the type-II multiferroic nature of this transition. Spectra of acoustic phonons, on the other hand, do not exhibit any significant temperature-dependent variation and, hence, there are no indications for a predominant magneto-elastic coupling associated with this phase transition.

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Section: Resultscontrasting

confidence: 41%

Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Ziegler

Köhler

Gibhardt

et al. 2019

Physica Status Solidi (b)

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“…Sol-gel synthesis. Series of powder samples were synthesized with a varying Al2O3/B2O3 ratio in the precursor phase using the nitrate decomposition method (ND) described elsewhere [8,25,26]. Aluminum nitrate nonahydrate [Al(NO3) 3•9H2O] and boric acid [B(OH)3] were mixed and dissolved in 10 wt% glycerol [1,2,3-propanetriol].…”

Section: Synthesismentioning

confidence: 99%

Crystal chemical characterization of mullite-type aluminum borate compounds

Hoffmann

Hooper

Zhao

et al. 2017

Journal of Solid State Chemistry

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Al-rich aluminum borate compounds were prepared by different synthesis routes using various initial Al/B ratios, characterized by diffraction methods, spectroscopy and prompt gamma activation analysis. The 11 B NMR data show a small amount of BO4 species to be present in all samples. The chemical analysis indicates a trend in the Al/B ratio instead of a fixed composition. Both methods indicate a solid solution expressed as Al5-xB1+xO9 where Al is substituted by B in the range of about 1-3%. The structure of the B-rich compound Al4B2O9 was re-investigated by electron diffraction methods, showing that structural details vary within a crystallite. In most of the domains the atoms are orderly distributed, showing no signal for the postulated channel oxygen atom O5. The absence of O5 is supported by density functional theory calculations. Other domains show a probable disordered configuration of O5 and O10, indicated by diffuse scattering along the b direction.

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“…The finely grained powder, synthesized as given in [18], was mixed with acetone, transferred to the corundum sample holder and mounted in the heat chamber after drying. Therefore, the thermal expansion was measured along the principal directions [100], [010] and [001] of the rectangular samples between 100 K and about 1 273 K using an inductive gauge dilatometer (DIL402C, Netzsch, Selb, Germany).…”

Section: Thermal Expansionmentioning

confidence: 99%

Thermal expansion and elastic properties of mullite-type Bi₂Ga₄O₉ and Bi₂Fe₄O₉ single crystals

Krenzel

Schreuer

Gesing

et al. 2012

International Journal of Materials Research

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Resonant ultrasound spectroscopy was used to characterize the elastic properties of single crystal orthorhombic Bi 2 Ga 4 O 9 and Bi 2 Fe 4 O 9 between room temperature and about 1 200 K. Additionally, the coefficients of thermal expansion were studied in the range 100 K to 1 280 K using high-resolution dilatometry and X-ray powder diffraction. for Bi 2 Fe 4 O 9 .I n both mullite-type compounds the strong bond chains built up by edge-sharing coordination octahedra extending parallel to [001] dominate the anisotropy of their elastic and thermoelastic properties. Smaller variations of elastic anisotropy within the (001) plane can be attributed to the specific type of cross-linking of the octahedral chains. The temperature evolution of the c ij shows no hint on any structural instability or glass-like transition that might be related to the suspected ion conductivity at high temperatures. However, in both crystal species characteristic anelastic relaxation phenomena occur in the ultrasonic frequency regime close to room temperature. The smallest thermal expansion is observed in the plane perpendicular to the stiffest octahedral chains. A model is discussed to explain the apparent discrepancy in terms of cross-correlations within the three-dimensional framework of edge-and corner-linked coordination polyhedra.

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Synthesis and properties of mullite-type (Bi1−xSrx)2(M11−yM2y)4O9−x (M=Al, Ga, Fe)

Cited by 45 publications

References 15 publications

Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Crystal chemical characterization of mullite-type aluminum borate compounds

Thermal expansion and elastic properties of mullite-type Bi₂Ga₄O₉ and Bi₂Fe₄O₉ single crystals

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Synthesis and properties of mullite-type (Bi1−xSrx)2(M11−yM2y)4O9−x (M=Al, Ga, Fe)

Cited by 45 publications

References 15 publications

Characterization of Multiferroic Bi2Mn4O10 by Dielectric and Neutron Spectroscopy

Characterization of Multiferroic Bi2Mn4O10 by Dielectric and Neutron Spectroscopy

Crystal chemical characterization of mullite-type aluminum borate compounds

Thermal expansion and elastic properties of mullite-type Bi2Ga4O9 and Bi2Fe4O9 single crystals

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Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Characterization of Multiferroic Bi₂Mn₄O₁₀ by Dielectric and Neutron Spectroscopy

Thermal expansion and elastic properties of mullite-type Bi₂Ga₄O₉ and Bi₂Fe₄O₉ single crystals