TEMPERATURE AND FREQUENCY DEPENDENCE OF MICROWAVE ELASTIC LOSSES IN β-RHOMBOHEDRAL BORON FOR LONGITUDINAL WAVES ALONG THE <i>c</i> AXIS

Young, John; Oliver, D. W.; Slack, Glen A.

doi:10.1063/1.1652658

Cited by 11 publications

(1 citation statement)

References 16 publications

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“…To have a low N one must choose materials with large 00. This conclusion was confirmed by experimental study of acoustic properties of a new synthetic single crystals 0-B [3]. As a result, Slack obtained the lowest known value, a, about 10 dB/ps at 10 GHz.…”

Section: Introductionsupporting

confidence: 80%

The use of yttrium-rare earth aluminium garnet solid solutions for bulk-acoustic-wave (BAW) devices

Иванов

1992

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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The isomorphic solid solution of yttrium-rare earth aluminium garnets is suggested as a dielectric material for acoustic waveguides with extremely low acoustic-wave absorption (AWA) at room temperature and for frequencies higher than 10 GHz. The two main mechanisms by which substitutional atoms decrease the bulk AWA are determined. The first one is the decrease in effective lifetime of the thermal phonons resulting in the corresponding reduction of the viscoelastic absorption-this mechanism is important for the shear acoustic waves. The second is more important for longitudinal waves. It is the reduction of Gruneisen constants for solid solution as compared to the crystal matrices.

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Section: Introductionsupporting

confidence: 80%

The use of yttrium-rare earth aluminium garnet solid solutions for bulk-acoustic-wave (BAW) devices

Иванов

1992

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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States of Thermal Equilibrium in β‐Rhombohedral Boron and Their Alteration by Optical Excitation

Werheit¹,

Franz²

1984

Physica Status Solidi (b)

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It is shown that p-rhombohedra1 boron has different states of thermal equilibrium a t T 5 150 and 2 180 K. These states can be distinguished by their optical absorption spectra showing electronic transitions into a bound state at 0.4 eV at low temperatures, and transitions into an energy continuum a t higher temperatures. By steady state optical excitation the transition temperat,ure is lowered indicating a kind of Mott transition. This phase transition is assumed to be the reason for the discontinuity of numerous physical properties of P-rhombohedra1 boron in this range of temperature. E s wird nachgewiesen, daB P-rhomboedrisches Bor bei T 5 150 und 2 180 K verschiedene thermodynamische Gleichgewichtszustande besitzt. Diese werden anhand der optischen Absorptionsspektren unterschieden, die bei tiefen Temperaturen elektronische obergange in einen gebundenen Zustand bei 0,4 eV, bei hohen Temperaturen in ein Energiekontinuum zeigen. Durch stationare optische Erregung wird die Umwandlungstemperatur abgesenkt, was fur eine Art Mottttbergang spricht. Dieser Phasenubergang liefert eine Begrundung fur die Diskontinuitat diverser physikalischer Eigenschaften des P-rhomboedrischen Bors in diesem Temperaturbereich.

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Boron (B) sound attenuation, phonon mean free path, beta-rhombohedral boron

Landolt-Börnstein - Group III Condensed Matter

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TEMPERATURE AND FREQUENCY DEPENDENCE OF MICROWAVE ELASTIC LOSSES IN β-RHOMBOHEDRAL BORON FOR LONGITUDINAL WAVES ALONG THE c AXIS

Cited by 11 publications

References 16 publications

The use of yttrium-rare earth aluminium garnet solid solutions for bulk-acoustic-wave (BAW) devices

The use of yttrium-rare earth aluminium garnet solid solutions for bulk-acoustic-wave (BAW) devices

States of Thermal Equilibrium in β‐Rhombohedral Boron and Their Alteration by Optical Excitation

Boron (B) sound attenuation, phonon mean free path, beta-rhombohedral boron

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