Structure of MgAlB<sub>14</sub> and a brief critique of structural relationships in higher borides

Matkovich, V. I.; Economy, James

doi:10.1107/s0567740870002868

Cited by 124 publications

(65 citation statements)

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“…Thus, this phase is radically different from MgAlB 12 , another Mg: Al = 1:1 phase known in the Mg-Al-B system, which crystallizes in the orthorhombic system with = 1 0313 nm, = 0 8115 nm, and = 0 5848 nm [15].…”

Section: Resultsmentioning

confidence: 99%

Structure and properties of solid solutions in the Mg-Al-B system

et al. 2011

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Ê Ú ¿½ Å Ý ¾¼½¼ ÔØ ¾ Â ÒÙ ÖÝ ¾¼½½ ×ØÖ ØCompounds with the general formula Mg 1− Al B 2 were obtained by two-step ceramic synthesis. All compounds were characterized by X-ray diffraction, NMR spectroscopy, and by four point probe resistivity measurements in various magnetic fields method. The diborides unit cell parameters were determined as a function of the Al mole fraction. With the vaues of up to 0.40 (where is the composition of the stock prepared for sintering), the unit cell parameters of Mg 1− Al B 2 are similar to those of pure MgB 2 and the superconducting transition temperature was lowered. For stock compositions of 0 25 ≤ ≤ 0 60, the products contain a superstructure, also superconducting phase, which becomes the only product at = 0 50, and at > 0 60 this phase is replaced by AlB 2 -based solid solutions.

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Section: Resultsmentioning

confidence: 99%

Structure and properties of solid solutions in the Mg-Al-B system

et al. 2011

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“…The metal sites are outside the icosahedra, in the large holes of the boron framework. In most compounds, they are only partly occupied [77][78][79][80][81][82][83][84][85][86][87][88]. For a summary of lattice parameters, see [89,90].…”

Section: γ -Bmentioning

confidence: 99%

Raman effect in icosahedral boron-rich solids

Werheit¹,

Филипов

Kuhlmann

et al. 2010

Science and Technology of Advanced Materials

133

116

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We present Raman spectra of numerous icosahedral boron-rich solids having the structure of α-rhombohedral, β-rhombohedral, α-tetragonal, β-tetragonal, YB 66 , orthorhombic or amorphous boron. The spectra were newly measured and, in some cases, compared with reported data and discussed. We emphasize the importance of a high signal-to-noise ratio in the Raman spectra for detecting weak effects evoked by the modification of compounds, accommodation of interstitial atoms and other structural defects. Vibrations of the icosahedra, occurring in all the spectra, are interpreted using the description of modes in α-rhombohedral boron by Beckel et al. The Raman spectrum of boron carbide is largely clarified. Relative intra-and inter-icosahedral bonding forces are estimated for the different structural groups and for vanadium-doped β-rhombohedral boron. The validity of Badger's rule is demonstrated for the force constants of inter-icosahedral B-B bonds, whereas the agreement is less satisfactory for the intra-icosahedral B-B bonds.

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“…Many compounds are known, such as AlMgB 14 , AlNaB 14 , AlLiB 14 , AlYB 14 , AlTbB 14 , AlDyB 14 , AlHoB 14 , AlErB 14 , AlYbB 14 and AlLuB 14 [1][2][3][4][5]. Bulk modulus of AlMgB 14 was measured to be in the range of 196-264 GPa [6].…”

Section: Introductionmentioning

confidence: 99%

Bonding and elastic properties of amorphous AlYB

Mušić

Hensling

Pazur

et al. 2013

Solid State Communications

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a b s t r a c tWe have studied the bonding and elastic properties of amorphous AlYB 14 using theoretical and experimental means. Based on pair distribution functions and Voronoi tessellation, the icosahedral bonding is expected. A rather large Young's modulus of 365 GPa is predicted for amorphous AlYB 14 .To verify these predictions, we have measured density, pair distribution functions, binding energy and elastic properties of Al-Y-B thin films synthesized by magnetron sputtering. The calculated and measured densities are with a deviation of 3.5% in good agreement. The measured binding energy and pair distribution functions are also consistent with icosahedral bonding. The measured Young's modulus is 305 719 GPa, which is 16% smaller than the theoretical value and hence in good agreement. Overall consistency between theory and experiments was obtained indicating that the computational strategy employed here is useful to describe correlations between bonding, elasticity, density as well as (chemical) short range order and may hence enable future knowledge-based design of these ternary borides which show great potential for surface protection applications.

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Structure of MgAlB₁₄ and a brief critique of structural relationships in higher borides

Cited by 124 publications

References 10 publications

Structure and properties of solid solutions in the Mg-Al-B system

Structure and properties of solid solutions in the Mg-Al-B system

Raman effect in icosahedral boron-rich solids

Bonding and elastic properties of amorphous AlYB

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Structure of MgAlB14 and a brief critique of structural relationships in higher borides

Cited by 124 publications

References 10 publications

Structure and properties of solid solutions in the Mg-Al-B system

Structure and properties of solid solutions in the Mg-Al-B system

Raman effect in icosahedral boron-rich solids

Bonding and elastic properties of amorphous AlYB

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Structure of MgAlB₁₄ and a brief critique of structural relationships in higher borides