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Synthesis, Structure, and Properties of BaCO3-(hR5)-Type PbCO3
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2024-01-09 , DOI: 10.1021/acs.cgd.3c01090
Wilson A. Crichton 1 , Lkhamsuren Bayarjargal 2 , Victor Milman 3 , Björn Winkler 2
Crystal Growth & Design ( IF 3.2 ) Pub Date : 2024-01-09 , DOI: 10.1021/acs.cgd.3c01090
Wilson A. Crichton 1 , Lkhamsuren Bayarjargal 2 , Victor Milman 3 , Björn Winkler 2
Affiliation
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A new recoverable form of PbCO3 has been synthesized at a pressure of 10.8 GPa and at temperatures higher than 735 K with a trigonal structure (a = 5.20727(14) Å and c = 8.4326(3) Å in a hexagonal setting at 1 bar and room temperature). This new structure of PbCO3, which has been derived from in situ diffraction data and then confirmed and refined using DFT calculations, is of the BaCO3-(hR5)-type, also known for BaCO3 at 1 bar and high temperatures. Data collected during its coexistence with aragonite-type PbCO3 indicate an increase of density of 4.8% at the transition. Our observations of the transformation are compatible with the transformation in the 6–10 GPa range to the field labeled PbCO3-III in previous studies of the phase diagram. DFT calculations have been employed to understand the Raman signature of this phase and predict its properties, such as its nonlinear optical effect. The latter was then experimentally studied, and here, we show that PbCO3-(hR5) is a chemically simple carbonate with very strong SHG effect.
中文翻译:
BaCO3-(hR5)-型PbCO3的合成、结构和性能
一种新的可回收形式的 PbCO 3在 10.8 GPa 的压力和高于 735 K 的温度下合成,具有三角结构(在 1 bar 的六方结构中a = 5.20727(14) Å 和c = 8.4326(3) Å)和室温)。 PbCO 3的这种新结构是BaCO 3 -( hR 5) 型,由原位衍射数据得出,然后使用DFT 计算进行确认和精炼,也称为1 bar 和高温下的BaCO 3型。在其与文石型PbCO 3共存期间收集的数据表明在转变时密度增加了4.8%。我们对转变的观察与先前相图研究中在 6-10 GPa 范围内向标记为 PbCO 3 -III 的场的转变一致。 DFT 计算已用于了解该相的拉曼特征并预测其特性,例如非线性光学效应。然后对后者进行了实验研究,在这里,我们证明 PbCO 3 -( hR 5) 是一种化学上简单的碳酸盐,具有非常强的倍频效应。
更新日期:2024-01-09
中文翻译:

BaCO3-(hR5)-型PbCO3的合成、结构和性能
一种新的可回收形式的 PbCO 3在 10.8 GPa 的压力和高于 735 K 的温度下合成,具有三角结构(在 1 bar 的六方结构中a = 5.20727(14) Å 和c = 8.4326(3) Å)和室温)。 PbCO 3的这种新结构是BaCO 3 -( hR 5) 型,由原位衍射数据得出,然后使用DFT 计算进行确认和精炼,也称为1 bar 和高温下的BaCO 3型。在其与文石型PbCO 3共存期间收集的数据表明在转变时密度增加了4.8%。我们对转变的观察与先前相图研究中在 6-10 GPa 范围内向标记为 PbCO 3 -III 的场的转变一致。 DFT 计算已用于了解该相的拉曼特征并预测其特性,例如非线性光学效应。然后对后者进行了实验研究,在这里,我们证明 PbCO 3 -( hR 5) 是一种化学上简单的碳酸盐,具有非常强的倍频效应。