The crystalline-to-amorphous transition in shock-loaded mullite Al2VI(Al2+2xSi2−2x)IVO10−x in the light of shear modulus anisotropy

Braue, W.; Hildmann, Bernd; Schneider, Hartmut; Hornemann, U.

doi:10.1016/j.jeurceramsoc.2009.05.051

Cited by 11 publications

(8 citation statements)

References 47 publications

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“…) is interpreted in terms of a gradual and irreversible structural decomposition of both mullites. This is consistent with a work by Braue et al . that reported a shock‐wave induced amorphization of mullite above 35 GPa.…”

Section: Discussionsupporting

confidence: 93%

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High‐Pressure Behavior of Mullite: An X‐Ray Diffraction Investigation

Kalita

Schneider²,

Lipinska

et al. 2013

J. Am. Ceram. Soc.

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Using synchrotron X‐ray diffraction and diamond anvil cells we performed in situ high‐pressure studies of mullite‐type phases of general formula Al4+2xSi2−2xO10−x and differing in the amount of oxygen vacancies: 2:1‐mullite (x = 0.4), 3:2‐mullite (x = 0.25), and sillimanite (x = 0). The structural stability of 2:1‐mullite, 3:2‐mullite, and sillimanite was investigated up to 40.8, 27.3, and 44.6 GPa, respectively, in quasi‐hydrostatic conditions, at ambient temperature. This is the first report of a static high‐pressure investigation of Al2O3–SiO2 mullites. It was found that oxygen vacancies play a significant role in the compression mechanisms of the mullites by decreasing the mechanical stability of the phases with the number of vacancies. Elevated pressure leads to an irreversible amorphization above ~20 GPa for 2:1‐mullite and above 22 GPa for 3:2‐mullite. In sillimanite, only a partial amorphization is observed above 30 GPa. Based on Rietveld structural refinements of high‐pressure X‐ray diffraction patterns, the pressure‐driven evolution of unit cell parameters is presented. The experimental bulk moduli obtained are as follows: K0 = 162(7) GPa with K0′ = 2.2(6) for 2:1‐mullite, K0 = 173(7) GPa with K0′ = 2.3(2) for 3:2‐mullite, K0 = 167(7) GPa with K0′ = 2.1(4) for sillimanite.

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Section: Discussionsupporting

confidence: 93%

“…A shock‐compression study by Kawai et al . reports a disproportionation of mullite to corundum and stishovite at ~30 GPa, whereas a work by Braue et al . reported shock‐wave induced amorphization of mullite above 35 GPa.…”

Section: Introductionmentioning

confidence: 99%

High‐Pressure Behavior of Mullite: An X‐Ray Diffraction Investigation

Kalita

Schneider²,

Lipinska

et al. 2013

J. Am. Ceram. Soc.

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“…Further out to the undeformed parts of the crystal areas of high plastic deformation with dislocation networks, radial microcracks and bend contours occur . Degradation of the mullite crystal structure versus a complete loss of the long‐range order by microindentation may be compared with similar effects produced by static and dynamic pressure loading and by intense ball milling …”

Section: Properties Of Mullitementioning

confidence: 99%

Mullite: Crystal Structure and Related Properties

2015

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Mullite is certainly one of the most important oxide materials for both conventional and advanced ceramics. Mullite belongs to the compositional series of orthorhombic aluminosilicates with the general composition Al 2 (Al 2+2x Si 2-2x )O 10-x . Main members are sillimanite (x = 0), stoichiometric 3/2-mullite (x = 0.25), 2/1-mullite (x = 0.40), and the SiO 2 -free phase ι-alumina (x = 1, crystal structure not known). This study gives an overview on the present state of research regarding single crystal mullite. Following a short introduction, the second part of the review focuses on the crystal structure of mullite. In particular, the characteristic mullite-type structural backbone of parallel chains consisting of edge-sharing MO 6 octahedra and their specific cross-linkage by TO 4 tetrahedra is explained in detail, the role of cation disorder and structural oxygen vacancies is addressed, and the possibility of cation substitution on different sites is discussed. The third part of the study deals with physical properties being relevant for technical applications of mullite and includes mechanical properties (e.g., elasticity, compressibility, strength, toughness, creep), thermal properties (e.g., thermal expansion, heat capacity, atomic diffusion, thermal conductivity), electrical conductivity, and optical properties. Special emphasis is put on structure-property relationships which allow for interpretation of corresponding experimental data and offer in turn the possibility to tailor new mullite materials with improved properties. Finally, the reported anomalies and discontinuities in the evolution of certain physical properties with temperature are summarized and critically discussed.

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“…This microstructural change was observed to produce significant changes in the ballistic performance of boron carbide. 13 Recently, Braue et al 14 have reported a crystalline-toamorphous phase transition in shock-loaded mullite. 8 Mullite is a common high-temperature refractory material.…”

Section: Instantaneous Nano-order Fragmentation In Mullite Ceramics Tmentioning

confidence: 99%

Instantaneous nano-order fragmentation in mullite ceramics triggered by a shock-induced phase transition

Atou

Kawai

Ito

et al. 2010

Journal of Applied Physics

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Surface fracture zones in shock-loaded polycrystalline ceramics AIP Conf. Proc. 429, 493 (1998); 10.1063/1.55552 Shock-induced phase transition of MnO and several other transition metal oxides AIP Conf.Mullite, a conventional refractory material, was observed to exhibit a peculiar nano-order fragmentation accompanying a phase transition induced by a shock wave. We propose a mechanism for this nanofragmentation, based on a comparative study of mullite-related materials. The microtextures of the mullite-related materials were affected by their initial crystal structure and chemical composition, indicating that oxygen vacancies in the crystal structure play an important role in the nanofragmentation. The results of the present study will help enable the deliberate control of the physical and mechanical properties of materials during high-velocity impact.

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The crystalline-to-amorphous transition in shock-loaded mullite Al2VI(Al2+2xSi2−2x)IVO10−x in the light of shear modulus anisotropy

Cited by 11 publications

References 47 publications

High‐Pressure Behavior of Mullite: An X‐Ray Diffraction Investigation

High‐Pressure Behavior of Mullite: An X‐Ray Diffraction Investigation

Mullite: Crystal Structure and Related Properties

Instantaneous nano-order fragmentation in mullite ceramics triggered by a shock-induced phase transition

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