“…Des mesures des coefficients de dilatation thermique ont dt6 effectu6es par Ezhkova, Zhdanov & Umanskii (1959), Ganesan (1962), Shibuya & Hoshino (1962), et Telle (1966), par diff6rentes m6thodes: rayons X, interf6rom6trie, dilatom6trie.…”
Section: (D) Valeurs De Ax ~ ~ Et ~Ounclassified
“…Nous avons compar6 ces diffdrentes mesures en calculant les coefficients propres de dilatation thermique, Compte tenu des remarques de Shibuya & Hoshino (1962) (dont les mesures publides ne sont pas suffisantes pour calculer tous les coefficients), nous avons fait ce calcul complet 5. partir des donn6es num6riques de Ganesan (1962) mais en changeant le signe du coefficient ale long de l'axe a. Dans ces conditions, ses r6-sultats sont en bon accord avec ceux des autres auteurs, en particulier avec Telle (1966). Le Tableau 1 compare …”
Anisotropic strains in anisotropic crystals (i.e.T.G.S. crystals) due to a uniform thermal gradient are calculated. The X-ray reflecting power of the sample is related to the strain gradient. Experimental measurements of the reflecting-power oscillations under an oscillating thermal gradient are compared with the results of calculations of the anisotropic strain-gradient oscillations and are in good agreement. Random fluctuations of the room temperature in normal operating conditions distort the sample sufficiently for the Pendell~Ssung fringes on X-ray section topographs to be completely blurred.
“…Des mesures des coefficients de dilatation thermique ont dt6 effectu6es par Ezhkova, Zhdanov & Umanskii (1959), Ganesan (1962), Shibuya & Hoshino (1962), et Telle (1966), par diff6rentes m6thodes: rayons X, interf6rom6trie, dilatom6trie.…”
Section: (D) Valeurs De Ax ~ ~ Et ~Ounclassified
“…Nous avons compar6 ces diffdrentes mesures en calculant les coefficients propres de dilatation thermique, Compte tenu des remarques de Shibuya & Hoshino (1962) (dont les mesures publides ne sont pas suffisantes pour calculer tous les coefficients), nous avons fait ce calcul complet 5. partir des donn6es num6riques de Ganesan (1962) mais en changeant le signe du coefficient ale long de l'axe a. Dans ces conditions, ses r6-sultats sont en bon accord avec ceux des autres auteurs, en particulier avec Telle (1966). Le Tableau 1 compare …”
Anisotropic strains in anisotropic crystals (i.e.T.G.S. crystals) due to a uniform thermal gradient are calculated. The X-ray reflecting power of the sample is related to the strain gradient. Experimental measurements of the reflecting-power oscillations under an oscillating thermal gradient are compared with the results of calculations of the anisotropic strain-gradient oscillations and are in good agreement. Random fluctuations of the room temperature in normal operating conditions distort the sample sufficiently for the Pendell~Ssung fringes on X-ray section topographs to be completely blurred.
“…The anisotropy of the dielectric properties of triglycine sulphate (TGS) has been demonstrated in many papers. Data concerning piezoelectric, electrostrictive and elastic properties [1][2][3][4][5][6][7][8], the influence of a uniaxial pressure on the value of the Curie temperature [9] and the thermal expansion in various directions [10][11][12][13][14][15][16] are just some of the findings of such investigations.…”
Susceptibility changes caused by an electric field applied in various directions not parallel to the ferroelectric axis have been measured both in paraelectric and in ferroelectric phases. An anisotropy of the relaxation phenomena has been found. Relaxation times of the order of 104 seconds have been observed.
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