PURPOSE: To make it possible to easily measure the magnetostriction of a magnetic crystal, by providing a permanent magnet to the leading end of a yoke and calculating the relative change amount of grating constant by using a magnetic field applying apparatus having such a structure that the yoke is driven by a motor.
CONSTITUTION: A square shaft 15 having a yoke 14 attached to the leading end thereof by the screw 13 provided to a gear 12 driven by a motor 10 is provided so as to pierce a holding plate 16 in a before and behind slidable manner and a pair of permanent magnets are fixed to the inside of the yoke 14. The yoke 14 provided with the permanent magnets 17 is formed so as to be freely attached to and detached from the shaft 15. By exchanging this yoke, a necessary magnetic field value can be obtained. A specimen support stand 18 having a specimen 6 attached thereto is set to the prescribed position in an X-ray diffraction apparatus and a magnetic field applying apparatus is placed so as to be opposed to the support stand 18 and the motor is driven to apply magnetic fields from the permanent magnets 17. By this method, magnetostriction constant can be easily measured.
UCHISHIBA HIDEMA
YAMAGUCHI KAZUYUKI
