Abstract
The structural phase transition in titanite is correlated with a strong temperature dependence of Raman scattering cross sections and, to a somewhat lesser extent, with shifts of the phonon frequencies. Their quantitative temperature evolution in the low-symmetry phase (P21/a) is compatible with a nearly 2D Ising behaviour with β≈0.12 and T c = 497 K. At temperatures above 860 K, the phonon signals agree with A 2/a symmetry but not in the temperature interval between 497 K and 860 K. In this temperature range new structural states give rise to additional phonon signals. A model based on mobile APBs between slabs of P21/a material, first proposed by van Heurck et al. (1991), is in qualitative agreement with our experimental observations.
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Bismayer U, Salje E, Jansen M, Dreher S (1986) Raman scattering near the structural phase transition of As2O5: order parameter treatment. J Phys C: Solid State Phys 19:4537–4545
Bismayer U (1990) Hard mode Raman spectroscopy and its application to ferroelastic and ferroelectric phase transitions. Phase Transitions 27:211–267
Bismayer U, Schmahl W, Schmidt C, Groat L (1992) Linear birefringence and X-ray diffraction studies of the phase transition in titanite, CaTiSiO5: X-ray and optical experiments. Phys Chem Minerals 19:260–266
Cheng C, Heine V, Jones IL (1990) Silicon Carbonate polytypes as equilibrium structures. J. Phys 2:5097–5134
Ghose S, Ito Y, Hatch DM (1991) Paraelectric-antiferroelectric phase transition in titanite, CaTiSiO5 I. A high temperature x-ray diffraction study of the order parameter and transition mechanism. Phys Chem Minerals 17:591–603
Griffith WP (1969) Raman studies on rock-forming minerals. Part 1. Orthosilicates and Cyclosilicates. J. Chem. Soc. A: 1372–1377
Higgins JB, Ribbe PH (1976) The crystal chemistry and space groups of natural and synthetic titanites. Am Mineral 61:878–888
Houchmanzadeh B, Lajzerowicz J, Salje E (1992) Interfaces and ripple states in ferroelastic crystals — a simple model. J Phys (in press)
Marais S, Heine V, Nex C, Salje E (1991) Phenomena due to strain coupling in phase transitions. Phys Rev L 66:2480–2483
Mongiorgi R, Riva di Sanseverino LR (1968) A reconsideration of the structure of titanite, CaTiSiO5. Mineral Petrogr Acta 14:123–141
Salje E, Palosz B, Wruck B (1987) In situ observation of the polytypic phase transition 2H-12R in PbI2: investigations of the thermodynamic, structural and dielectric properties. J Phys C: Solid State Phys 20:4077–4096
Salje EKH (1990) Phase transitions in ferroelastic and co-elastic crystals, Cambridge University Press, Cambridge, UK
Salje EKH (1991) Some aspects of the thermodynamic behaviour of ferroelastic and co-elastic phase transitions, Phase Transitions 34:25–52
Salje EKH (1992) Hard mode spectroscopy: experimental studies of structural phase transitions. Phase Transitions 37:83–110
Speer JA, Gibbs GV (1976) The crystal structure of synthetic titanite, CaTiOSiO4, and the domain textures of natural titanites. Am Mineral 61:238–247
Tanaka I, Obuchi T, Kohima H (1988) Growth and characterization of titanite (CaTiSiO5) single crystals by the floating zone method. J Crystal Growth 87:169–174
Taylor M, Brown GE (1976) High temperature structural study of the P21/a⇌A2/a phase transition in synthetic titanide, CaTiSiO5. Am Mineral 61:435–447
Van Heurck C, Van Tendeloo G, Ghose S, Amelinckx S (1991) Paraelectric-antiferroelectric phase transition in titanite, CaTi-SiO5 II. Electron diffraction and electron microscopic studies of transition dynamics. Phys Chem Minerals 17:604–610
Winkler B, Dove MT, Salje E, Leslie M, Palosz B (1990) Phonon stabilized polytypism in PbI2: in situ Raman spectroscopy and transferable core-shell model calculations. J Phys 3:539–550
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Salje, E., Schmidt, C. & Bismayer, U. Structural phase transition in titanite, CaTiSiO5: A ramanspectroscopic study. Phys Chem Minerals 19, 502–506 (1993). https://doi.org/10.1007/BF00203191
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DOI: https://doi.org/10.1007/BF00203191