Thermal Expansion of Aluminoborates

Fisch, Martin; Armbruster, Thomas

doi:10.1007/978-3-642-20018-2_25

Cited by 4 publications

(10 citation statements)

References 18 publications

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“…The thermal behavior of Al 5 BO 9 was recently reported by Fisch and Armbruster . The thermal expansion, along with the volume compression in response to the applied pressure, allows us to provide a P–T–V Equation‐of‐State of Al 5 BO 9.…”

Section: Introductionmentioning

confidence: 73%

“…The Al 5 BO 9 crystals used in this study, and in those of Gatta et al ., Fisch et al ., and Fisch and Armbruster, were synthesized by slow cooling of a starting mixture in a flux consisting of 0.50 g K 2 CO 3 and 1.56 g MoO 3 corresponding to 1K 2 CO 3 + 3MoO 3 → K 2 Mo 3 O 10 + CO 2 ↑ . The starting mixture was composed of Al 2 O 3 and B 2 O 3 mixed in a molar ratio of 9:2 (i.e., 0.03 g B 2 O 3 and 0.19 g Al 2 O 3 ).…”

Section: Methodsmentioning

confidence: 99%

“…The authors showed that all boron‐mullites can be derived from a hypothetical aristotype (with topological symmetry P 4/ mbm ), in which the main building block is represented by chains of edge‐sharing MO 6 octahedra running along [001]. A significant number of studies have been focused on the stability fields, solubility, and crystal chemistry of the compounds belonging to the ternary system Al 2 O 3 –B 2 O 3 –SiO 2 …”

Section: Introductionmentioning

confidence: 99%

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High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

et al. 2013

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Phase stability, elastic behavior, and pressure-induced structural evolution of synthetic boron-mullite Al 5 BO 9 (a = 5.6780 (7), b = 15.035(6), and c =7.698(3) A, space group Cmc2 1 , Z = 4) were investigated up to 25.6(1) GPa by in situ single-crystal synchrotron X-ray diffraction with a diamond anvil cell (DAC) under hydrostatic conditions. No evidence of phase transition was observed up to 21.7(1) GPa. At 25.6(1) GPa, the refined unit-cell parameters deviated significantly from the compressional trend, and the diffraction peaks appeared broader than at lower pressure. At 26.7(1) GPa, the diffraction pattern was not indexable, suggesting amorphization of the material or a phase transition to a high-pressure polymorph. Fitting the P-V data up to 21.7(1) GPa with a second-order Birch-Murnaghan Equation-of-State, we obtained a bulk modulus K T0 = 164(1) GPa. The axial compressibilities, here described as linearized bulk moduli, are as follows: K T0(a) = 244(9), K T0(b) = 120(4), and K T0(c) = 166(11) GPa (K T0(a) :K T0(b) : K T0(c) = 2.03:1:1.38). The structure refinements allowed a description of the main deformation mechanisms in response to the applied pressure. The stiffer crystallographic direction appears to be controlled by the infinite chains of edge-sharing octahedra running along [100], making the structure less compressible along the a-axis than along the band c-axis.

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Section: Introductionmentioning

confidence: 73%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

et al. 2013

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“…Fisch and Armbruster [31] recently investigated the structural evolution of synthetic mullite-type Al 5 BO 9 and Al 4 B 2 O 9 with increasing temperature. The rigid body behavior of the BO 3 units agrees well with the results of Gatta et al [32] who investigated the pressure-induced structural evolution of Al 5 BO 9 and also give a comparative analysis of the elastic behavior of mullite-type materials.…”

Section: Resultsmentioning

confidence: 99%

Boron mullite: Formation and basic characterization

Lührs

Fischer

Schneider

2012

Materials Research Bulletin

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“…Lührs et al measured the thermal expansion coefficient of mullite containing 13.6 mol% B 2 O 3 . The mean thermal expansion coefficient is 5.0 × 10 −6 C −1 , which is ca 15% less than that of mullite without B. Fisch et al obtained anisotropic thermal expansion coefficients α a = 2.55 × 10 −6 K −1 , α b = 6.31 × 10 −6 K −1 , α c = 4.71 × 10 −6 K −1 between 298 and 1273 K by temperature‐dependent X‐ray diffraction method. However, other thermal and mechanical properties are still lacking, which are important for the applications of this fascinating mullite‐type material.…”

Section: Introductionmentioning

confidence: 97%

Al₅BO₉: A Wide Band Gap, Damage‐Tolerant, and Thermal Insulating Lightweight Material for High‐Temperature Applications

Zhou

Xiang

2016

J. Am. Ceram. Soc.

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The electronic structure, chemical bonding, mechanical, and thermal properties of a B‐containing mullite Al5BO9 were investigated using a combination of first‐principles calculations, Debye model, Clack model, and Slack's equation. The results show that Al5BO9 has a wide band gap of 6.4 eV. The bonding in BO3 triangle and AlO4 tetrahedron is covalent‐ionic, whereas that in AlO6 octahedra and AlO5 bipyramids is ionic‐covalent. The maximum (245 GPa) and minimum Young's modulus (161 GPa) are along [100] and [010] direction, respectively. Based on the low shear modulus (78 GPa) and low Pugh's ratio (G/B = 0.497), Al5BO9 is predicted as a damage‐tolerant ceramic. The most likely slip systems are [010](100) and [100](010). The high Debye temperature (956 K) indicates good high‐temperature stability. The minimum thermal conductivity is estimated to be 1.59 W·(m·K)−1, and the thermal conductivity decreases with temperature as 2071.9/T.

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Thermal Expansion of Aluminoborates

Cited by 4 publications

References 18 publications

High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

Boron mullite: Formation and basic characterization

Al₅BO₉: A Wide Band Gap, Damage‐Tolerant, and Thermal Insulating Lightweight Material for High‐Temperature Applications

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Thermal Expansion of Aluminoborates

Cited by 4 publications

References 18 publications

High‐Pressure Behavior and Phase Stability of Al5BO9, a Mullite‐Type Ceramic Material

High‐Pressure Behavior and Phase Stability of Al5BO9, a Mullite‐Type Ceramic Material

Boron mullite: Formation and basic characterization

Al5BO9: A Wide Band Gap, Damage‐Tolerant, and Thermal Insulating Lightweight Material for High‐Temperature Applications

Contact Info

Product

Resources

About

High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

High‐Pressure Behavior and Phase Stability of Al₅BO₉, a Mullite‐Type Ceramic Material

Al₅BO₉: A Wide Band Gap, Damage‐Tolerant, and Thermal Insulating Lightweight Material for High‐Temperature Applications