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 language | English (US) |
|---|---|
| Pages (from-to) | 69-74 |
| Number of pages | 6 |
| Journal | Journal of Physics and Chemistry of Solids |
| Volume | 85 |
| DOIs | |
| State | Published - May 4 2015 |
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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 journal › Article
}
TY - JOUR
T1 - Heat capacity, thermal expansion and heat transport in the Han Blue (BaCuSi4O10)
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
PY - 2015/5/4
Y1 - 2015/5/4
N2 - 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.
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.
KW - Crystal structure
KW - Optical materials
KW - Specific heat
KW - Thermal conductivity
KW - Thermal expansion
UR - http://www.scopus.com/inward/record.url?scp=84929178811&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84929178811&partnerID=8YFLogxK
U2 - 10.1016/j.jpcs.2015.04.021
DO - 10.1016/j.jpcs.2015.04.021
M3 - Article
AN - SCOPUS:84929178811
VL - 85
SP - 69
EP - 74
JO - Journal of Physics and Chemistry of Solids
JF - Journal of Physics and Chemistry of Solids
SN - 0022-3697
ER -