Ultrastable phonon frequencies in α -quartz-type BPO 4 at high temperature

R. Le Parc (1) , E. Buixaderas (2, 3, 4) , C. Levelut (1) , P. Hermet (5) , A. Pereira (6) , Olivier Cambon (5) , Claire Roiland (7) , P. Simon (2, 3) , J. Haines (5)

1 L2C - Laboratoire Charles Coulomb
2 CEMHTI - Conditions Extrêmes et Matériaux : Haute Température et Irradiation
3 UO - Université d'Orléans
4 CAS - Czech Academy of Sciences [Prague]
5 ICGM - Institut Charles Gerhardt Montpellier - Institut de Chimie Moléculaire et des Matériaux de Montpellier
6 UFRGS - Universidade Federal do Rio Grande do Sul [Porto Alegre]
7 ISCR - Institut des Sciences Chimiques de Rennes

The Raman modes of α-quartz-type boron phosphate were found to be extremely stable in frequency over a large temperature range from 300–1000 K. In order to determine the origin of this behavior, the material was also studied at high pressure up to 6 GPa. Upon compression, a classical behavior was observed with mode Grüneisen parameters ranging from −0.08(2) to 3.0(1). The present results indicate that the high temperature behavior in this material is an example of an unusual compensation effect between phonon–phonon interactions and implicit contributions due to thermal expansion. Phonon stability is of utmost importance for materials properties that are dependent on it such as dielectric and piezoelectric properties, for example. Boron phosphate belongs to the important class of α-quartz-type piezoelectric materials for which temperature stability is of primordial importance for resonator and sensor applications.

Domaines: Matériaux

R. Le Parc, E. Buixaderas, C. Levelut, P. Hermet, A. Pereira, et al.. Ultrastable phonon frequencies in α -quartz-type BPO 4 at high temperature. Applied Physics Letters, 2019, 115 (14), pp.141902. ⟨10.1063/1.5111621⟩. ⟨hal-02319058⟩