Ukrainian Journal of Physical Optics 
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Structure and optical anisotropy of K1.75(NH4)0.25SO4 solid solution

1,2Shchepanskyi P.A., 1Kushnir O.S., 1Stadnyk V.Yo., 3Fedorchuk A.O., 1,2Rudysh M.Ya., 1Brezvin R.S., 1Demchenko P.Yu. and 4Krymus A.S.

1Ivan Franko National University of Lviv, 8 Kyrylo and Mefodiy Street, 79005  Lviv, Ukraine
2J. Dlugosz Academy of Czestochowa, Armii Krajowej 13/15, PL-42-201 Czestochowa, Poland
3Lviv National University of Veterinary Medicine and Biotechnologies, 50 Pekarska  Street, 79010 Lviv, Ukraine
4Eastern European National University, 13 Volya Avenue, 43025 Lutsk, Ukraine

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Abstract. In this work we have grown single crystals Kx(NH4)2–xSO4 (x»1.75), which belong to a potassium–ammonium sulfate family, and studied their room–temperature structure. Spectral dependences of the principal refractive indices and principal optical birefringences are measured in the visible region. Anomalous birefringence dispersion is observed along the light propagation direction parallel to the principal x axis. According to our birefringence extrapolation based on the Sellmeier fit for the refractive indices, the symmetry of optical indicatrix at the room temperature should increase at the light wavelength λIP»1350±60 nm. This corresponds to a specific ‘isotropic point’ defined by the condition nx(λIP) = ny(λIP), which has not been detected in either K2SO4 or (NH4)2SO4 crystals.

Keywords: potassium–ammonium sulfate, crystal structure, refractive indices, optical anisotropy, birefringence, dispersion, isotropic point

PACS: 78.20.Ci, 78.20.Hp, 81.40.Vw
UDC: 535.323, 535.5, 535.012, 548.0
Ukr. J. Phys. Opt. 18 187-196
doi: 10.3116/16091833/18/4/187/2017
Received: 20.07.2017 

Анотація. У цій роботі вирощено монокристали Kx(NH4)2–xSO4 (x»1.75), які належать до родини сульфату калію–амонію, а також вивчено їхню структуру за кімнатної температури. Досліджено спектральні залежності головних показників заломлення та головних оптичних двопроменезаломлень у видимій області. Вздовж напрямку розповсюдження світла паралельно до головної осі х спостерігаємо аномальну дисперсію подвійного променезаломлення. Відповідно до екстраполяції подвійного променезаломлення на основі апроксимації Зельмеєра показників заломлення, симетрія оптичної індикатриси за кімнатної температури повинна підвищитися на довжині світлової хвилі λIP»1350±60 нм. Це відповідає специфічній «ізотропній точці», визначеній умовою nx(λIP) = ny(λIP). Цю точку досі не було виявлено ні в кристалах K2SO4 ні в (NH4)2SO4 K2SO4.
 
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