Journal ArticleDOI
Effect of high pressure on the crystal structures of lanthanide trialuminides
John F. Cannon,H. Tracy Hall +1 more
Reads0
Chats0
TLDR
The effect of high pressure on the crystal structures of LnAl 3 (Ln = Lanthanide) compounds has been determined by exposing the compounds to high pressure and high temperature conditions in a tetrahedral-anvil apparatus.Abstract:
The effect of high pressure on the crystal structures of LnAl 3 (Ln = Lanthanide) compounds has been determined by exposing LnAl 3 compounds or stoichiometric mixtures of the elements, to high-pressure and high-temperature conditions in a tetrahedral-anvil apparatus. In accordance with considerations of relative compressibilities, the application of high pressure tends to make the lower-atomic-weight lanthanides behave more like those of higher atomic weight. Thus, high-pressure-induced polymorphic changes were in the direction of structures with increased cubic character. Polymorphs or compounds first reported in this paper are BaPb 3 -type GdAl 3 , HoAl 3 -type TbAl 3 and Cu 3 Au-type LuAl 3 . The first two are hexagonal with lattice parameters α = 6.231, c = 21.173 A , and α = 6.095, c = 35.96 A , respectively. The third compound is cubic, with lattice parameter α = 4.186 A .read more
Citations
More filters
Journal ArticleDOI
Criteria for developing castable, creep-resistant aluminum-based alloys - A review
TL;DR: In this paper, the authors describe four criteria for the selection of alloying elements capable of producing castable, precipitation-strengthened Al alloys with high-temperature stability and strength.
Journal ArticleDOI
The Crystal Structures of Zr3Al3C5, ScAl3C3, and UAl3C3and Their Relation to the Structures of U2Al3C4and Al4C3
TL;DR: In this paper, the structure determination of ZrAlC2−x was improved to P63/mc (R=0.024 for 519 structure factors and 23 variable parameters) with the exception of one aluminum site.
Journal ArticleDOI
Temperature dependent lattice misfit and coherency of Al3X (X = Sc, Zr, Ti and Nb) particles in an Al matrix
TL;DR: In this paper, the lattice coherency and critical radii for Al3X precipitates in an aluminum matrix were computed using first-principles methods using density functional perturbation theory and the quasi-harmonic approximation.
Journal ArticleDOI
Core–shell nanoscale precipitates in Al–0.06 at.% Sc microalloyed with Tb, Ho, Tm or Lu
TL;DR: In this article, the age-hardening response at 300°C of binary Al-0.06Sc and 0.02Tb was found to be similar to that of binary α-Al(Sc), except that a shorter incubation period for hardening is observed, which is associated with nanoscale RE-rich Al 3 (RE 1− x Sc x ) precipitates.
Book ChapterDOI
Chapter 13 Crystal chemistry of intermetallic compounds
A. Iandelli,A. Palenzona +1 more
TL;DR: In this article, the authors discuss compound formation in binary systems, compositions and structure types, metallic and ionic radii, mean atomic volumes and volume contractions, and most frequently occurring compositions (R5X3, RX, RX2, RX3), and intermetallic compounds with anomalous lanthanide valence states.
References
More filters
Journal ArticleDOI
High‐Pressure Equation of State for NaCl, KCl, and CsCl
TL;DR: In this article, the equation of state for NaCl from a Mie-Gruneisen equation was repeated using more accurate values of the zero pressure compressibility, and extended to KCl and CsCl.
Journal ArticleDOI
Less Common Metals
TL;DR: A review of developments and improvements in process technology for fabricating beryllium, chromium, hafnium, molybdenum, niobium, rhenium, tantalum, tungsten, and zirconium is given in this paper.
Journal ArticleDOI
Some High‐Pressure, High‐Temperature Apparatus Design Considerations: Equipment for Use at 100 000 Atmospheres and 3000°C
TL;DR: In this paper, a simple piston and cylinder device capable of generating pressures to 50 000 atmospheres simultaneously with temperatures of 5000°C, and a tetrahedral-anvil device that has been successfully tested at 100,000 atmospheres and 3000°C was described.
Journal ArticleDOI
The structures of the rare-earth trialuminides
J.H.N. van Vucht,K.H.J. Buschow +1 more
TL;DR: In this paper, an extensive study has been made of the trialuminides of the rare-earth metals, and detailed structures of a number of rhombohedral and ternary triangulation structures are given.