title: Na2B6O9F2: A Fluoroborate with Short Cutoff Edge and Deep-Ultraviolet Birefringent Property Prepared by an Open High-Temperature Solution Method.
abstract: As important materials in modulating the polarization of light, birefringent crystals have attracted considerable attention and played crucial roles in the field of optical communication and the laser industry. Limited by the transparency range, few birefringent crystals can be used in the deep-ultraviolet (DUV) region, except for α-BaB2O4(α-BBO). However, the application of α-BBO in the DUV range is restricted by the relatively high cutoff edge and low transmittance rate below 200 nm. In this paper, we design and synthesize a new fluoroborate, Na2B6O9F2, by introducing fluorine into borate system. It possesses a short cutoff edge of 169 nm and birefringence larger than 0.080 at 589.3 nm. The Na2B6O9F2crystals with sizes up to 3.0 mm × 1.5 mm × 0.2 mm have been grown with good quality by a high-temperature solution method in the open system. First-principles calculations were carried out to understand the optical properties.
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Guoqiang
authors.initials: G
authors.lastname: Shi
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.
authors.forename: Fangfang
authors.initials: F
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Zhang
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Dianwei
authors.initials: D
authors.lastname: Hou
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.|University of the Chinese Academy of Sciences , Beijing 100049, China.
authors.forename: Xinglong
authors.initials: X
authors.lastname: Chen
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.
authors.forename: Zhihua
authors.initials: Z
authors.lastname: Yang
authors.affiliation: Key Laboratory of Functional Materials and Devices for Special Environments, Xinjiang Technical Institute of Physics & Chemistry, and Xinjiang Key Laboratory of Electronic Information Materials and Devices, Chinese Academy of Sciences , 40-1 South Beijing Road, Urumqi 830011, China.
authors.forename: Shilie
authors.identifier: http://orcid.org/0000-0003-4521-4507
authors.initials: S
authors.lastname: Pan