On the elastic properties of (N(CH3)4)2ZnCl4in the incommensurate and the commensurate phases

Käräjämäki, E.; Laiho, R.; Levola, T.

doi:10.1088/0022-3719/16/34/003

Cited by 13 publications

(3 citation statements)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…We have previously studied the longitudinal elastic behaviour in TMATC-Zn from Brillouin scattering [33] and found no anomalies in the hypersonic elastic constants and only a small increase in the longitudinal attenuation at -20 GHz on cooling below T;. These results are in fairly good agreement with those of Karajamaki et al for this compound [34] and for TMATC-Cu [35].…”

supporting

confidence: 88%

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Berger¹,

Benoı̂t²,

Garland³

et al. 1986

J. Phys. France

View full text Add to dashboard Cite

The shear elastic constants c44, c55, and c66 of single-crystal [N(CH3)4] 2ZnCl4 have been measured at 10 MHz near the normal-incommensurate transition at Ti ≃ 23°C, the incommensurate-ferroelectric commensurate lock-in transition at Tc ≃ 8°C, and the first-order ferroelectric-ferroelastic transition at T1 ≃ 4°C. A substantial variation in the velocity and attenuation of the c66-mode ultrasonic shear wave in the incommensurate phase can be understood qualitatively in terms of soliton-phonon coupling. The longitudinal attenuation α associated with the c11 mode was also studied as a function of frequency (10-70 MHz) near T i. The critical attenuation in the incommensurate phase could be well characterized by α ≃ f2(Ti - T)-0.9

show abstract

supporting

confidence: 88%

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Berger¹,

Benoı̂t²,

Garland³

et al. 1986

J. Phys. France

View full text Add to dashboard Cite

show abstract

“…These transitions have been confirmed and studied by Brillouin (Karajamaki, Lacho & Levola, 1983), EPR (Machida, Suhara, Aono & Kobayashi, 1983), Raman (Henocque, Sauvajol, Lefebvre & Marion, 1983) and diffraction techniques (Marion, 1981;Almairac, Ribet, Ribet & Bziouet, 1980;. The crystal structure of phase I (basic structure) was solved by Wiesner, Srivastava, Kennard, Di Vaira & Lingafelter (1967).…”

Section: Introductionmentioning

confidence: 85%

“…Starting from room temperature, TMATC-Zn presents five phase transitions: 297K 281K 277K 171K 159K I II III IV V VI, T, L where the transition temperatures correspond to those obtained by calorimetric measurements by Ruiz-Larrea, Lopez-Echarri & Tello (1981). These transitions have been confirmed and studied by Brillouin (Karajamaki, Lacho & Levola, 1983), EPR (Machida, Suhara, Aono & Kobayashi, 1983), Raman (Henocque, Sauvajol, Lefebvre & Marion, 1983) and diffraction techniques (Marion, 1981;Almairac, Ribet, Ribet & Bziouet, 1980;. The crystal structure of phase I (basic structure) was solved by Wiesner, Srivastava, Kennard, Di Vaira & Lingafelter (1967).…”

Section: Introductionmentioning

confidence: 86%

Structural analysis of the incommensurate and lock-in phases of tetramethylammonium tetrachlorozincate(II), [N(CH₃)₄]₂[ZnCl₄]

Madariaga¹,

Zúñiga²,

Pérez-Mato³

et al. 1987

Acta Crystallogr Sect B

View full text Add to dashboard Cite

The structures of the incommensurate and lock-in phases of [N(CH3)4]2[ZnC14] have been determined and analysed in terms of symmetry modes. X-ray diffraction intensities of the incommensurate phase, including first-and second-order satellites, were collected at 286.4 K. Refinements were performed in the superspace group P(Pmcn):(s, 1, -1) including in the modulation function harmonics up to second order.0108-7681/87/040356-13501.50From a total of 475 independent reflections, final R values of 0.077, 0.052, 0.121 and 0.49 for all, main, first-and second-order reflections, respectively, were obtained. First-order harmonics dominate in the modulation, the most important component of the distortion being that parallel to the a axis. The refinements of the lock-in ferroelectric structure were performed in the space group P21 cn, using as starting parameters those of the basic structure extended to five cells. A final R = 0.075 for 917 observed reflec-

show abstract

Elastic properties of K4LiH3(SO4)4 crystals

Mróz

Laiho

1989

Phys. Stat. Sol. (a)

View full text Add to dashboard Cite

The series impedance method and Brillouin scattering technique are applied to study elastic properties of K4LiH3(SO4)4 (KLHS) in the temperature range from 90 to 300 K. A strong increase in damping of piezoelectric vibrations for T → TC (TC = 115 K) together with a change in the slope of the function ϱv2(T) at TC are observed for three longitudinal phonons propagating in the directions [100], [110], and [001]. The observed temperature changes in elastic properties of KLHS point to the nonferroelastic character of the phase transition of this crystal at 115 K.

show abstract

On the elastic properties of (N(CH₃)₄)₂ZnCl₄in the incommensurate and the commensurate phases

Cited by 13 publications

References 22 publications

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Structural analysis of the incommensurate and lock-in phases of tetramethylammonium tetrachlorozincate(II), [N(CH₃)₄]₂[ZnCl₄]

Elastic properties of K4LiH3(SO4)4 crystals

Contact Info

Product

Resources

About

On the elastic properties of (N(CH3)4)2ZnCl4in the incommensurate and the commensurate phases

Cited by 13 publications

References 22 publications

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Ultrasonic study of the normal — incommensurate — commensurate phase transitions in [N(CH3)4]2ZnCl 4

Structural analysis of the incommensurate and lock-in phases of tetramethylammonium tetrachlorozincate(II), [N(CH3)4]2[ZnCl4]

Elastic properties of K4LiH3(SO4)4 crystals

Contact Info

Product

Resources

About

On the elastic properties of (N(CH₃)₄)₂ZnCl₄in the incommensurate and the commensurate phases

Structural analysis of the incommensurate and lock-in phases of tetramethylammonium tetrachlorozincate(II), [N(CH₃)₄]₂[ZnCl₄]