Ytterbium: Transition at High Pressure from Face-Centered Cubic to Body-Centered Cubic Structure

Area of Science:

• Condensed matter physics
• Materials science

Background:

• Ytterbium (Yb) is a rare-earth metal with unique electronic properties.
• Phase transitions in metals under extreme conditions are crucial for understanding material behavior.

Purpose of the Study:

• To investigate the effects of high pressure on the crystalline structure of ytterbium metal.
• To quantify changes in atomic and macroscopic volume during the phase transformation.

Main Methods:

• Subjecting ytterbium metal to a pressure of 40,000 atmospheres at 25 degrees C.
• Analyzing structural changes using X-ray diffraction (not explicitly stated but implied).
• Measuring atomic and macroscopic volume changes.

Main Results:

• A phase transformation occurred in ytterbium metal.
• The crystal structure changed from face-centered cubic (FCC) to body-centered cubic (BCC).
• Atomic radius decreased from 1.82 to 1.75 Å, resulting in an 11% decrease in atomic volume.
• Macroscopic volume decreased by 3.2%.

Conclusions:

• Extreme pressure induces significant structural and volumetric changes in ytterbium.
• The FCC to BCC transition in ytterbium is accompanied by substantial atomic compression.
• Understanding these high-pressure phenomena is key for materials science applications.