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Phase transitions in as-grown K0.2Rb1.8Cd2(SO4)3 langbeinite crystals: a birefringence study

Zapeka B., Klymiv I. M., Teslyuk I., Vlokh O. V., Martynyuk-Lototska I. and Vlokh R.

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Abstract. Basing on temperature dependences of the light intensity transmitted through polarisation system and the birefringence of K0.2Rb1.8Cd2(SO4)3 crystals, we have determined the phase transition temperature for this solid solution. A conclusion is drawn that the monoclinic and triclinic phases on the (x, T)-phase diagram for the mixed crystals K2xRb2(1–x)Cd2(SO4)3  should disappear at the triple points occurring at x < 0.1.

Keywords: polarised light, langbeinite crystals, phase transitions

PACS: 42.25.Ja, 77.80.Bh
UDC: 535.5, 538.9 
Ukr. J. Phys. Opt. 14 70-73
doi: 10.3116/16091833/14/2/70/2013
Received: 07.02.2013

Анотація.  На основі дослідження температурної залежності інтенсивності світла, що пройшло крізь поляризаційну систему і кристал K0.2Rb1.8Cd2(SO4)3, та двозаломлення в роботі визначено температуру фазового переходу у цих твердих розчинах і показано, що моноклінна та триклінна фази повинні зникати з (x, T) - фазової діаграми кристалів K2xRb2(1–x)Cd2(SO4)3 у потрійних точках за умови x < 0,1.
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