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- W2046483386 abstract "An uniquely-modified Kosters prism interferometer for the simultaneous and independent measurement of refractive index, δn(T), and thermal expansion, δl(T), as a function of temperature in the range 308-1273 K, is described. The capabilities of the system are demonstrated via measurement of δn(T) and δl(T) along both the [100] and [001] directions up to and through the α-8 phase transition in quartz, with results in good agreement with previous measurements. Further to this, experiments to determine δn(T) and δn(T) along the [100], [010] and [001] directions in the orthorhombic nonlinear optical crystal indium-doped KTiOAsO 4 are described. The results are used to show that the ferroelectric-paralectric phase transition at T c =1063 K is second-order and exhibits Landau-type behaviour over a range of 100 K below T c . Finally, similar experiments on the orthorhombic crystal Ba 2 NaNb 5 O 15 are reported. The behaviours of δn(T) and δl(T) at the ferroelastic phase transition at 563 K and the ferroelectric-paraelectric phase transition at T c = 849 K are discussed. Clear evidence of the existence of polar fluctuations in the paraelectric phase is presented." @default.
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- W2046483386 date "1996-10-01" @default.
- W2046483386 modified "2023-09-24" @default.
- W2046483386 title "A New Kösters Prism Interferometer for Simultaneous Determination of Refractive Index and Thermal Expansion of Crystals as a Function of Temperature" @default.
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- W2046483386 doi "https://doi.org/10.1107/s0021889896006590" @default.
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