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Abstract <p>Two isosymmetric (sp. gr. <i>P</i>2<sub>1</sub>2<sub>1</sub>2<sub>1</sub>) polymorphic modifications of RbB<sub>3</sub>O<sub>5</sub> (α, low-temperature; and β, high-temperature) were obtained by solid-state reactions. Their thermal deformations, mechanism and temperature of polymorphic transition were studied in detail using powder high-temperature X-ray diffraction in the range 30–740°C. Before the transition, the structure of α-RbB<sub>3</sub>O<sub>5</sub> deforms to prepare for the abrupt change in Rb atom position without breaking the boron-oxygen framework. The Kurtz–Perry method is used to evaluate the second-harmonic generation (SHG) responses of the polymorphs and compare them with crystalline quartz. The α-RbB<sub>3</sub>O<sub>5</sub> polymorph exhibits a nonlinear optical (NLO) coefficient more than two times greater than that of β-RbB<sub>3</sub>O<sub>5</sub>. A comparison of optical and thermal properties within the series of alkali triborates shows that the low-temperature polymorph possesses superior NLO properties.</p>

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Thermal Structural Evolution and Optical Properties of Isosymmetric Nonlinear-Optical Borates α- and β-RbB3O5

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • G. S. Sizov,
  • A. V. Povolotskiy,
  • M. G. Krzhizhanovskaya,
  • R. S. Bubnova,
  • S. K. Filatov

摘要

Abstract

Two isosymmetric (sp. gr. P212121) polymorphic modifications of RbB3O5 (α, low-temperature; and β, high-temperature) were obtained by solid-state reactions. Their thermal deformations, mechanism and temperature of polymorphic transition were studied in detail using powder high-temperature X-ray diffraction in the range 30–740°C. Before the transition, the structure of α-RbB3O5 deforms to prepare for the abrupt change in Rb atom position without breaking the boron-oxygen framework. The Kurtz–Perry method is used to evaluate the second-harmonic generation (SHG) responses of the polymorphs and compare them with crystalline quartz. The α-RbB3O5 polymorph exhibits a nonlinear optical (NLO) coefficient more than two times greater than that of β-RbB3O5. A comparison of optical and thermal properties within the series of alkali triborates shows that the low-temperature polymorph possesses superior NLO properties.