Solids with different sound velocity at diffrent tempratures

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The discussion focuses on the search for solids that exhibit varying sound velocities and mass densities at different temperatures, particularly in the context of phononic crystals. The original poster has only identified Barium Strontium Titanate (BST) as a suitable material and seeks additional options. A suggestion is made to conduct a Google search on "Bulk Modulus Versus Temperature" to find relevant materials. The conversation emphasizes the need for diverse materials in this area of research. Further exploration of existing literature may yield more suitable candidates.
Mehran
i work on phononic crystals and i want to find solids with diffrent sound velocities and mass density in diffrent temprature
i can just find BST
but i need more matherials
please help me my friends
best regards
 
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Mehran said:
i work on phononic crystals and i want to find solids with diffrent sound velocities and mass density in diffrent temprature
i can just find BST
but i need more matherials
please help me my friends
best regards
Welcome to the PF.

I did a google search on Bulk Modulus Versus Temperature, and got lots of good hits. Maybe start there?
 
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Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

Thread 'Unexpected irregular reflection signal from a high-finesse cavity'

I am observing an irregular, aperiodic noise pattern in the reflection signal of a high-finesse optical cavity (finesse ≈ 20,000). The cavity is normally operated using a standard Pound–Drever–Hall (PDH) locking configuration, where an EOM provides phase modulation. The signals shown in the attached figures were recorded with the modulation turned off. Under these conditions, when scanning the laser frequency across a cavity resonance, I expected to observe a simple reflection dip. Instead...
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