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New phase transition in CsPbBr3.

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Bibliographic Details
Title:	New phase transition in CsPbBr3.
Authors:	Malyshkin, Dmitry¹ (AUTHOR) Dmitry.Malyshkin@urfu.ru, Sereda, Vladimir¹ (AUTHOR), Ivanov, Ivan¹ (AUTHOR), Mazurin, Maksim¹ (AUTHOR), Sednev-Lugovets, Anton¹ (AUTHOR), Tsvetkov, Dmitry¹ (AUTHOR), Zuev, Andrey¹ (AUTHOR)
Source:	Materials Letters. Nov2020, Vol. 278, pN.PAG-N.PAG. 1p.
Subjects:	Phase transitions, Reversible phase transitions, Differential scanning calorimetry, Cesium, Space groups
Abstract:	• Fully reversible phase transition was found in CsPbBr 3 between 45 °C and 57 °C. • New CsPbBr 3 phase is stable at least in the temperature range (57–62) °C. • Novel CsPbBr 3 phase possesses orthorhombic (Cmcm) crystal structure. Using a combination of in situ high-temperature X-ray diffraction and differential scanning calorimetry methods, the phase behavior of cesium lead bromide CsPbBr 3 was investigated in the temperature range of (25–200) °C. In addition to the previously reported P n m a → P 4 / m b m and P 4 / m b m → P m 3 - m phase transitions, a new fully reversible transition was found to occur between 45 °C and 57 °C. A novel phase, which is stable at least in the temperature range of (57–62) °C, has an orthorhombic structure with Cmcm space group, which makes the sequence of phase transitions upon heating the same for both CsPbBr 3 and CsPbCl 3 halides: P n m a → C m c m → P 4 / m b m → P m 3 - m. [ABSTRACT FROM AUTHOR]
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Database:	Engineering Source

Description
Abstract:	• Fully reversible phase transition was found in CsPbBr 3 between 45 °C and 57 °C. • New CsPbBr 3 phase is stable at least in the temperature range (57–62) °C. • Novel CsPbBr 3 phase possesses orthorhombic (Cmcm) crystal structure. Using a combination of in situ high-temperature X-ray diffraction and differential scanning calorimetry methods, the phase behavior of cesium lead bromide CsPbBr 3 was investigated in the temperature range of (25–200) °C. In addition to the previously reported P n m a → P 4 / m b m and P 4 / m b m → P m 3 - m phase transitions, a new fully reversible transition was found to occur between 45 °C and 57 °C. A novel phase, which is stable at least in the temperature range of (57–62) °C, has an orthorhombic structure with Cmcm space group, which makes the sequence of phase transitions upon heating the same for both CsPbBr 3 and CsPbCl 3 halides: P n m a → C m c m → P 4 / m b m → P m 3 - m. [ABSTRACT FROM AUTHOR]
ISSN:	0167577X
DOI:	10.1016/j.matlet.2020.128458