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Effect of impurities on the successive phase transitions in (Cs1-xRbx)(2)ZnI4 compounds / I. P. Aleksandrova [et al.] // J. Phys.: Condens. Matter. - 2002. - Vol. 14, Is. 49. - P. 13623-13634, DOI 10.1088/0953-8984/14/49/316. - Cited References: 27 . - ISSN 0953-8984

РУБ Physics, Condensed Matter
Рубрики:
X-RAY
   CS2ZNI4
   SYSTEM
   HEAT
Кл.слова (ненормированные):
Phase transitions -- Point defects -- Specific heat -- Temperature -- X ray diffraction analysis -- Zinc compounds -- Lock-in transition -- Nuclear quadrupole resonance -- Single crystals
Аннотация: The heat capacity, nuclear quadrupole resonance (NQR) and x-ray diffraction of (Cs1-xRbx)(2)ZnI4 single crystals have been measured, for x = 0, 0.001, 0.005, 0.01, 0.025 and 0.05. The normal to incommensurate (N-Inc) phase transition at T-I, the incommensurate to commensurate (Inc-C) lock-in transition at T-L and the structural commensurate monoclinic to triclinic transition at T-LT, observed in the parent compound (x = 0), takes place for x = 0, 0.001, 0.005 and 0.01. For x = 0.025 only T-I and T-L are detected, while for x = 0.05 no transitions were observable. The values of T-I and T-L increase with x while T-LT decreases and disappears at the concentration x = 0.025. The effect of defects, besides modifying the transition temperatures, is that of broadening and lowering the heat capacity anomaly at the lock-in transition until its total quenching for x = 0.05. No observable hysteresis is detected in this transition. NQR and x-ray diffraction data show the Inc-C transition up to the highest concentration. We conclude that this phenomenology is caused by weak interaction of the incommensurate modulation with point defects even in the region close to the Inc-C transition.

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Держатели документа:
Russian Acad Sci, LV Kirensky Phys Inst, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Zaragoza, CSIC, Inst Ciencia Mat Aragon, E-50009 Zaragoza, Spain
ИФ СО РАН
L V Kirenski Institute of Physics, Russian Academy of Sciences, Siberian Branch, 660036 Krasnoyarsk, Russian Federation
Inst. de Ciencia de Mat. de Aragon, CSIC-Universidad de Zaragoza, 50009 Zaragoza, Spain

Доп.точки доступа:
Aleksandrova, I. P.; Александрова, Инга Петровна; Bartolome, J.; Falvello, L. R.; Torres, J. M.; Sukhovskii, A. A.; Суховский, Андрей Андреевич
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Phase transitions in the (Cs1-xRbx)(2)Znl(4) system / A. A. Sukhovskii [et al.] // Phys. Solid State. - 1999. - Vol. 41, Is. 1. - P. 128-131, DOI 10.1134/1.1131082. - Cited References: 8 . - ISSN 1063-7834

РУБ Physics, Condensed Matter
Рубрики:
CS2ZNI4
Аннотация: (Cs1-xRbx) 2ZnI4 crystals were grown by two different methods with Rb concentrations varying from x=0 to 2.5%. I-127 NQR and calorimetric measurements showed that crystals grown by the Bridgman technique contain residual impurities (similar to 0.5%) for all x. While x=0 crystals grown from solution do not contain detectable impurities, they allow incorporation only of a low Rb concentration, not above 0.5%. A transition-temperature-concentration (x) phase diagram has been constructed for Bridgman-grown crystals from NQR data. Rb doping shifts the normal-incommensurate and incommensurate-ferroelastic phase-transition points toward higher temperatures with different rates. The P2(1)/m↔P1 first-order transition shifts toward lower temperatures. The region of low Rb concentrations lies closest to the critical point. (C) 1999 American Institute of Physics. [S1063-7834(99)03001-4].

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Держатели документа:
Russian Acad Sci, AV Kirenskii Inst Phys, Siberian Branch, Krasnoyarsk 660036, Russia
Univ Saragossa, Saragossa 50009, Spain
ИФ СО РАН

Доп.точки доступа:
Sukhovskii, A. A.; Суховский, Андрей Андреевич; Lisin, V. V.; Aleksandrova, I. P.; Александрова, Инга Петровна; Voronov, V. N.; Воронов, Владимир Николаевич; Melero, J. J.
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