Acoustic-mode vibrational anharmonicity related to the anomalous thermal expansion of Invar iron alloys.
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Origin of the Invar effect in iron–nickel alloys
TL;DR: In this paper, the volume dependences of magnetic and thermodynamic properties for the most typical Invar system, a random face-centred cubic iron-nickel alloy, in which they allow for non-collinear spin alignments, that is, spins that may be canted with respect to the average magnetization direction.
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Auxeticity of cubic materials
TL;DR: A general expression for the directionally anisotropic Poisson's ratio (PR) of cubic materials under external pressure is discussed in this article, expressed in terms of the elastic moduli ratios, where K is the bulk modulus and G, Ware shear moduli, and where the mechanical stability criteria are taken into account.
Negative thermal expansion
TL;DR: In this paper, the authors present a simple experiment that involves a metallic sphere passing through a metal ring, but after the sphere is heated, it will have expanded with the result that it can no longer pass through the ring.
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Auxeticity of cubic materials under pressure
TL;DR: In this article, a decomposition of the XY plane with the elastic constant ratio is introduced to facilitate the interpretation of cubic materials under hydrostatic pressure,, and isotropic tension, which are two qualitatively different situations.
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Method of making an acoustic wave resonator
TL;DR: In this paper, a ferromagnetic compensator is used to compensate for temperature-induced effects introduced by an electrode-piezoelectric stack, and a metallic flashing layer is added to at least partially enclose the compensator.
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Ultrasonic Phase Velocity by the Pulse‐Echo‐Overlap Method Incorporating Diffraction Phase Corrections
TL;DR: In this article, the pulse-echo-overlap method for ultrasonic time-delay measurements is reviewed and a method for choosing the correct cyclic overlap for the rf within the echoes is given.
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Acoustic phonon instabilities and structural phase transitions
TL;DR: In this paper, an effective Hamiltonian was constructed to describe the homogeneous deformations and their fluctuations at structural phase transitions, and it was shown that the transitions are expected to be first order because of the presence of cubic invariants in the effective Hamiltonians.
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Temperature dependent magnetic contributions to the high field elastic constants of nickel and an Fe-Ni alloy
TL;DR: In this paper, the elastic constants C 44, 1 2 (C 11 −C 12 ) and 1 2(C 11 +C 12 +2C 44 ) have been measured in nickel and an Fe-30% Ni alloy through their respective Curie temperatures at high enough applied magnetic fields to eliminate the ordinary Δ E effect associated with domain wall motion.
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Single crystalline elastic constants of ferromagnetic face centered cubic Fe-Ni invar alloys☆
G Hausch,Hans Warlimont +1 more
TL;DR: In this article, the Bethe-Slater curve is used to classify the anomalous behavior of the elastic constants of Fe-Ni Invar alloys in both the ferromagnetic and paramagnetic states.
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Grüneisen Gamma from Elastic Data
K. Brugger,T. C. Fritz +1 more
TL;DR: In this article, the second-order elastic coefficients for isotropic, cubic, and rhombohedral materials are expressed in terms of second-and third-order coefficients for arbitrary crystal symmetry.