PL EN


Preferences help
enabled [disable] Abstract
Number of results
1995 | 87 | 3 | 611-617
Article title

Optical Investigations of Phase Transitions in (NH_{4})_{2}SbF_{5} Crystal

Content
Title variants
Languages of publication
EN
Abstracts
EN
Results of optical thickness and refractive indices measurements for (NH_{4})_{2}SbF_{5} crystal in the temperature range 100-310 K are presented. The measurements were done with interference method using He-Ne laser (λ = 632.8 nm). At T_{c1} = 292 K and T_{C2} = 168 K two continuous phase transitions with critical indices β_{1} = 0.38 and β_{2} ≤ 0.57 were observed. Ad­ditional anomaly of temperature changes of interference order with maximum at T_{c3} ≈ 132 K were found. This anomaly resembles a diffused transition. Temperature-averaged values of derivatives of refractive indices dn_{g} /dT = -3.3 × 10^{-5} K and dn_{m}/dT = -2.9 × 10^{-5} K^{-1} evidenced a decrease in optical anisotropy (birefringence) along the b-axis on heating run.
Keywords
EN
Publisher

Year
Volume
87
Issue
3
Pages
611-617
Physical description
Dates
published
1995-03
received
1994-03-29
(unknown)
1994-09-06
Contributors
  • Lviv State I. Franko University, Kyryla and Mefodiya 8, 290005 Lviv, Ukraine
author
  • Institute of Experimental Physics, University of Wrocław, Pl. M. Borna 9, 50-204 Wrocław, Poland
author
  • Lviv State I. Franko University, Kyryla and Mefodiya 8, 290005 Lviv, Ukraine
References
Document Type
Publication order reference
Identifiers
YADDA identifier
bwmeta1.element.bwnjournal-article-appv87z305kz
JavaScript is turned off in your web browser. Turn it on to take full advantage of this site, then refresh the page.