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A low temperature pyrolytic route to amorphous quasi-hexagonal boron nitride from hydrogen rich (NH4)3Mg(BH4)5.
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-01-02 , DOI: 10.1039/c9dt03766g Wojciech Wegner 1 , Karol J Fijalkowski , Wojciech Grochala
Dalton Transactions ( IF 3.5 ) Pub Date : 2020-01-02 , DOI: 10.1039/c9dt03766g Wojciech Wegner 1 , Karol J Fijalkowski , Wojciech Grochala
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Pure amorphous quasi-hexagonal boron nitride with minute amounts of amorphous quasi-cubic form was obtained via thermal decomposition of a novel tri-ammonium magnesium penta-borohydride precursor, (NH4)3Mg(BH4)5, in the temperature range of 220-250 °C, which is significantly lower than 1000-1500 °C applied in industrial approaches. The (NH4)3Mg(BH4)5 precursor, the most hydrogen rich mixed-cation borohydride salt known to date (21 wt% H), was prepared via low temperature high-energy dry disc-milling. The compound adopts a tetragonal I4/mcm unit cell isostructural with Rb3Mg(BH4)5 and Cs3Mg(BH4)5. The multi-step thermal decomposition yields hydrogen contaminated with B2H6 and borazine volatiles. The solid residue rinsed with water corresponds to amorphous boron nitride of high purity as evidenced by 11B MAS NMR, PXRD, FTIR and EDX analyses.
中文翻译：
从富氢（NH4）3Mg（BH4）5到非晶态准六方氮化硼的低温热解路线。
通过在220-250的温度范围内对新型三铵五硼氢化镁铝（NH4）3Mg（BH4）5进行热分解，获得具有微量非晶准立方晶形式的纯非晶准六方氮化硼。 °C，大大低于工业方法中使用的1000-1500°C。（NH 4）3 Mg（BH 4）5前体是迄今为止已知的最富氢的混合阳离子硼氢化盐（21 wt％H），是通过低温高能干盘磨制备的。该化合物采用具有Rb3Mg（BH4）5和Cs3Mg（BH4）5的四边形I4 / mcm晶胞。多步热分解产生被B2H6和硼嗪挥发物污染的氢。如11B MAS NMR，PXRD，FTIR和EDX分析所证明，用水冲洗的固体残留物相当于高纯度的无定形氮化硼。
更新日期：2020-01-10
中文翻译：
从富氢（NH4）3Mg（BH4）5到非晶态准六方氮化硼的低温热解路线。
通过在220-250的温度范围内对新型三铵五硼氢化镁铝（NH4）3Mg（BH4）5进行热分解，获得具有微量非晶准立方晶形式的纯非晶准六方氮化硼。 °C，大大低于工业方法中使用的1000-1500°C。（NH 4）3 Mg（BH 4）5前体是迄今为止已知的最富氢的混合阳离子硼氢化盐（21 wt％H），是通过低温高能干盘磨制备的。该化合物采用具有Rb3Mg（BH4）5和Cs3Mg（BH4）5的四边形I4 / mcm晶胞。多步热分解产生被B2H6和硼嗪挥发物污染的氢。如11B MAS NMR，PXRD，FTIR和EDX分析所证明，用水冲洗的固体残留物相当于高纯度的无定形氮化硼。
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