Abstract
The Raman spectra of tetragonal TbPO4 (zircon-type I4 1/amd structure, D4h19 space group) have been measured at ambient conditions and under variable pressure up to 15.5GPa inside a diamond anvil cell (DAC). Assignment of the Raman active modes of the tetragonal phase has been carried out based on polarized measurements from a single oriented crystal of TbPO4 at ambient conditions. The abrupt Raman mode discontinuities and the appearance of numerous new Raman peaks at a pressure Pc≈9.5GPa have provided strong evidence for a first-order phase transition to a lower crystal symmetry, most likely monoclinic. The high-pressure structure appears to be more compact compared to the tetragonal one, and is retained upon bringing the crystal to ambient pressure.
Original language | English |
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Article number | 425216 |
Journal | Journal of Physics Condensed Matter |
Volume | 20 |
Issue number | 42 |
DOIs | |
State | Published - 22 Oct 2008 |
Externally published | Yes |