Pressure Measurement Made by the Utilization of Ruby Sharp-Line Luminescence

@article{Forman1972PressureMM,
  title={Pressure Measurement Made by the Utilization of Ruby Sharp-Line Luminescence},
  author={Richard A. Forman and Gasper J. Piermarini and J. Dean Barnett and Stanley Block},
  journal={Science},
  year={1972},
  volume={176},
  pages={284 - 285}
}
A rapid, convenient technique for precision pressure measurement in the diamond-anvil high-pressure cell, which makes use of the sharp-line (R-line) luminescence of ruby, has been developed. The observed shift is -0.77 �0.03 reciprocal centimeters per kilobar for R1 and -0.84� 0.03 reciprocal centimeters per kilobar for R2 to lower energy and is approximately linear in the range studied (to 22 kilobars). Line-broadening has been observed in some instances and has been tentatively identified… 

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Note: a portable, light-emitting diode-based ruby fluorescence spectrometer for high-pressure calibration.

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Diamond anvils driven by a simple piston and screw device have been used to subject solid samples to pressures up to 300 kbar at ambient room temperature. Samples can be examined optically and by

Instrumentation for Single Crystal X‐Ray Diffraction at High Pressures

A diamond anvil high pressure cell made of beryllium, a special goniometer head, and a Buerger‐type precession camera designed for x‐ray diffraction by single crystals at high pressures are described

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TLDR
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TLDR
Allotropes of lanthanum, cerium, praseodmium, and neodymiumc have been observed at elevated pressures with an x-ray diffraction camera which incorporates a diamondanvil, high-pressure cell which has a face-centered cubic structure.

Pressure‐Induced Phase Transformation in NaCl

A pressure‐induced phase transformation in NaCl which occurs rapidly and reversibly at approx 300 kbar and room temperature has been observed in a diamond‐anvil high‐pressure cell. X‐ray diffraction

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ZusammenfassungEs wird der Temperatur- und Druckeinfluß auf Linien des Cr+++ im Rubin und Alexandrit und des Nd+++ in Pr(Nd)(NO3)3·6H2O untersucht. Durch Druckerhöhung (Verkleinerung der