Relaxation Kinetics of the Microhardness of KDP Crystals after Their Exposure to a Magnetic Field
It has been shown that potassium dihydrogen phosphate crystals change their microhardness reversibly after their exposure to a magnetic field of B = 0.8 or 1.2 T for t m = 7–90 min. It has been found that the magnetic effect can be conveniently characterized by the quantity B 2 t m , because the var...
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Veröffentlicht in: | JETP letters 2018-08, Vol.108 (4), p.231-236 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | It has been shown that potassium dihydrogen phosphate crystals change their microhardness reversibly after their exposure to a magnetic field of
B
= 0.8 or 1.2 T for
t
m
= 7–90 min. It has been found that the magnetic effect can be conveniently characterized by the quantity
B
2
t
m
, because the variation of the parameters conserving
B
2
t
m
=const does not change the result. At
B
2
t
m
< 10 T
2
min, the effect is almost absent. Above this threshold, the amplitude of changes in the microhardness increases and approaches a constant value of ~10% at
B
2
t
m
≈ 19 T
2
min. The responses of samples of the same crystal from the faces of the prismatic and pyramidal growth sectors to exposure are different. In the former case, they soften; in the latter case, the hardening stage follows the softening stage. However, in both cases, the microhardness returns to the initial value. At
B
2
t
m
values from 19 to 37 T
2
min, the amplitudes and durations of the effect do not change, but in the narrow range of 37–43 T
2
min, the lifetime of the modified state increases sharply with transition to a new level: “sharp” peaks with a half-width of ~2 days are transformed to trapezoids with the width of the horizontal side of ~1–2 weeks. A physical scheme of the observed effects has been proposed. |
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ISSN: | 0021-3640 1090-6487 |
DOI: | 10.1134/S0021364018160038 |