TY - JOUR

T1 - The structural origin and boundaries of thermal transitions in stillwellite-type LnBSiO5

AU - Кржижановская, Мария Георгиевна

AU - Верещагин, Олег Сергеевич

AU - Копылова, Юлия Олеговна

AU - Горелова, Людмила Александровна

AU - Панькин, Дмитрий Васильевич

AU - Юхно, Валентина Анатольевна

AU - Власенко, Наталия Сергеевна

AU - Бочаров, Владимир Николаевич

AU - Бритвин, Сергей Николаевич

PY - 2024/1/1

Y1 - 2024/1/1

N2 - Stillwellite-type borosilicates, LnBSiO5 represent a family of promising non-linear optical materials. The incorporation of different rare earths into the Ln sites results in complicate patterns of phase transitions. We herein analyze the high-temperature (HT) structural transformations of LnBSiO5 (Ln = Nd, Ce, La) using a suite of in situ HT methods: single-crystal structural study, powder X-ray diffraction and Raman spectroscopy, accompanied by thermal analysis. It is shown that phase transitions between the low- and high-temperature polymorphs of LnBSiO5 originate from the order-disorder in borate chains and are greatly dependent on the nature of the rare earth in the Ln sites. We showed that the high-temperature polymorphs of LnBSiO5 (Ln = Nd, Ce, La) are always metastable at ambient conditions, regardless of lanthanide cation type.

AB - Stillwellite-type borosilicates, LnBSiO5 represent a family of promising non-linear optical materials. The incorporation of different rare earths into the Ln sites results in complicate patterns of phase transitions. We herein analyze the high-temperature (HT) structural transformations of LnBSiO5 (Ln = Nd, Ce, La) using a suite of in situ HT methods: single-crystal structural study, powder X-ray diffraction and Raman spectroscopy, accompanied by thermal analysis. It is shown that phase transitions between the low- and high-temperature polymorphs of LnBSiO5 originate from the order-disorder in borate chains and are greatly dependent on the nature of the rare earth in the Ln sites. We showed that the high-temperature polymorphs of LnBSiO5 (Ln = Nd, Ce, La) are always metastable at ambient conditions, regardless of lanthanide cation type.

KW - Borosilicate

KW - Borate

KW - Stillwellite

KW - LaBSiO5

KW - NdBSiO5

KW - Phase transition

KW - Negative thermal expansion

KW - Non-linear optical materials

KW - Borate

KW - Borosilicate

KW - LaBSiO5

KW - NdBSiO5

KW - Negative thermal expansion

KW - Non-linear optical materials

KW - Phase transition

KW - Stillwellite

UR - https://www.mendeley.com/catalogue/bb8ddc39-ac12-35d0-beeb-bf114066c828/

U2 - 10.1016/j.optmat.2023.114651

DO - 10.1016/j.optmat.2023.114651

M3 - Article

VL - 147

JO - Optical Materials

JF - Optical Materials

SN - 0925-3467

M1 - 114651

ER -