Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10): Observation of structural phase transitions

S. H. Masunaga, A. Rebello, A. T. Schye, N. Prasai, J. J. Neumeier, Joshua Cohn

Research output: Contribution to journalArticle

2 Citations (Scopus)

Abstract

Structural phase transitions at 87 K and 103 K are reported for single-crystalline Han Blue (BaCuSi4O10) by means of high-resolution thermal-expansion, thermal conductivity and heat capacity measurements. The phase transition at 103 K results in differing lengths of the a and b lattice parameters, and thus a lowering of the crystallographic symmetry. Negative thermal-expansion coefficients are observed perpendicular to the c-axis over a wide temperature range (108K1=-1.09 and γ3=1.06 at room temperature; the bulk Grüneisen parameter is γ=0.10. The results are consistent with the presence of low-energy vibrations associated with the collective motions of CuO4 and Si4O10 polyhedral subunits.

Original languageEnglish (US)
Pages (from-to)69-74
Number of pages6
JournalJournal of Physics and Chemistry of Solids
Volume85
DOIs
StatePublished - May 4 2015

Fingerprint

Specific heat
Thermal expansion
thermal expansion
Phase transitions
specific heat
heat
Lattice constants
lattice parameters
Thermal conductivity
thermal conductivity
Crystalline materials
vibration
Temperature
high resolution
symmetry
room temperature
coefficients
temperature
Hot Temperature
energy

Keywords

  • Crystal structure
  • Optical materials
  • Specific heat
  • Thermal conductivity
  • Thermal expansion

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Chemistry(all)
  • Materials Science(all)

Cite this

Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10) : Observation of structural phase transitions. / Masunaga, S. H.; Rebello, A.; Schye, A. T.; Prasai, N.; Neumeier, J. J.; Cohn, Joshua.

In: Journal of Physics and Chemistry of Solids, Vol. 85, 04.05.2015, p. 69-74.

Research output: Contribution to journalArticle

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T2 - Observation of structural phase transitions

AU - Masunaga, S. H.

AU - Rebello, A.

AU - Schye, A. T.

AU - Prasai, N.

AU - Neumeier, J. J.

AU - Cohn, Joshua

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AB - Structural phase transitions at 87 K and 103 K are reported for single-crystalline Han Blue (BaCuSi4O10) by means of high-resolution thermal-expansion, thermal conductivity and heat capacity measurements. The phase transition at 103 K results in differing lengths of the a and b lattice parameters, and thus a lowering of the crystallographic symmetry. Negative thermal-expansion coefficients are observed perpendicular to the c-axis over a wide temperature range (108K1=-1.09 and γ3=1.06 at room temperature; the bulk Grüneisen parameter is γ=0.10. The results are consistent with the presence of low-energy vibrations associated with the collective motions of CuO4 and Si4O10 polyhedral subunits.

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