Matches in SemOpenAlex for { <https://semopenalex.org/work/W2088506585> ?p ?o ?g. }
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- W2088506585 abstract "This paper reviews the experimental studies of displacive phase transitions in solids. Primary emphasis is upon inelastic light scattering and neutron scattering; related infrared reflectivity measurements, as well as x-ray and EPR analyses are also summarized. Several prototype structures are considered in detail: (1) the rocksalt IV-VI semiconductors PbTe, SnTe, and GeTe; (2) the ferroelectric perovskites exemplified by PbTi${mathrm{O}}_{3}$ and BaTi${mathrm{O}}_{3}$; (3) perovskites which exhibit cell-doubling transitions, such as LaAl${mathrm{O}}_{3}$, SrTi${mathrm{O}}_{3}$, and KMn${mathrm{F}}_{3}$; (4) crystals having the $ensuremath{alpha}$-quartz structure, including Ge${mathrm{O}}_{2}$, Si${mathrm{O}}_{2}$, and AlP${mathrm{O}}_{4}$; (5) the improper ${mathrm{Gd}}_{2}$${(mathrm{M}mathrm{o}{mathrm{O}}_{4})}_{3}$ and ${mathrm{Tb}}_{2}$${(mathrm{M}mathrm{o}{mathrm{O}}_{4})}_{3}$; (6) the V-VI-VII semiconductors typified by SbSI; (7) the hydrogen-bonded ferroelectrics of the K${mathrm{H}}_{2}$P${mathrm{O}}_{4}$ family; (8) Jahn-Teller systems such as DyV${mathrm{O}}_{4}$ and RbCo${mathrm{F}}_{3}$, in which structural distortions occur as secondary effects; (9) order-disorder systems such as NaN${mathrm{O}}_{2}$ and the ammonium halides (N${mathrm{H}}_{4}$Cl, N${mathrm{H}}_{4}$Br), in which no soft occurs in the spectral region ($ensuremath{omega}g{10}^{11}$ Hz) probed by ir, Raman, and neutron spectroscopy; (10) $ensuremath{beta}$-tungsten ($Aensuremath{-}15$) structures such as ${mathrm{V}}_{3}$Si and ${mathrm{Nb}}_{3}$Sn, which exhibit high-temperature superconductivity. These crystal categories are used to illustrate several phenomena of current physical interest: Specifically, we discuss harmonic and anharmonic mode coupling; critical exponents $ensuremath{beta}$ differing from one-half in the temperature dependences of the order parameter $ensuremath{phi}(T)={ensuremath{phi}}_{0}{(Tensuremath{-}{T}_{0})}^{ensuremath{beta}}$ and of the soft-mode frequency $ensuremath{omega}(T)={ensuremath{omega}}_{0}{(Tensuremath{-}{T}_{0})}^{ensuremath{beta}}$; and the recently discovered central modes centered at zero frequency, which grow in intensity as the transition temperature ${T}_{0}$ is approached from above or below. The review covers the period 1940-1972. A few 1973 works are mentioned for which the author had preprints in 1972 or very early 1973. This review is in no sense a comprehensive survey of ferroelectricity. Readers are referred to the following earlier reviews on that subject: Silverman (1966, 1969), Cochran and Cowley (1967), Blinc (1968), Murzin et al. (1968), Nettleton (1970), and Blinc and Zaks (1972)." @default.
- W2088506585 created "2016-06-24" @default.
- W2088506585 creator A5037970469 @default.
- W2088506585 date "1974-01-01" @default.
- W2088506585 modified "2023-10-01" @default.
- W2088506585 title "Soft-mode spectroscopy: Experimental studies of structural phase transitions" @default.
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