In situ neutron diffraction study of the formation of Ho2Ge2O7 pyrochlore at high temperature and pressure,Dalton Transactions

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In situ neutron diffraction study of the formation of Ho2Ge2O7 pyrochlore at high temperature and pressure
Dalton Transactions ( IF 3.5 ) Pub Date : 2017-10-20 00:00:00 , DOI: 10.1039/c7dt03370b
Helen Y. Playford _{1,

2,

3,

4} , Craig L. Bull _{1,

2,

3,

4} , Matthew G. Tucker _{5,

6,

7,

8} , Nicholas P. Funnell _{1,

2,

3,

4} , Christopher J. Ridley _{1,

2,

3,

4} , Kenneth P. Marshall _{4,

9,

10,

11} , Richard I. Walton _{4,

9,

10,

11}

Affiliation

The formation of the spin-ice pyrochlore Ho₂Ge₂O₇ by two different high temperature, high pressure routes has been explored using in situ neutron diffraction. The first route involves the solid-state reaction of Ho₂O₃ and GeO₂, and formation of the pyrochlore phase is observed at 994(27) °C and 3.81(2) GPa, which are significantly milder conditions than those previously reported. The second route involves the hydrothermal synthesis of the tetragonal Ho₂Ge₂O₇ pyrogermanate from Ho(NO₃)₃·5H₂O and GeO₂ and its subsequent transformation to the pyrochlore phase, which is observed at 683(23) °C and 3.89(3) GPa. The lowering of the formation temperature of high pressure phases by employment of a precursor of appropriate stoichiometry may also have applications in the wider field of solid-state chemistry.

中文翻译：

高温高压下Ho ₂ Ge ₂ O ₇烧绿石形成的原位中子衍射研究

利用原位中子衍射研究了通过两种不同的高温高压途径形成的自旋冰烧绿石Ho ₂ Ge ₂ O ₇。第一条路线涉及Ho ₂ O ₃和GeO ₂的固态反应，并在994（27）°C和3.81（2）GPa观察到烧绿石相的形成，这比以前报道的条件要温和得多。第二种途径涉及四方何的水热合成₂的Ge ₂ ö ₇ pyrogermanate从豪（NO ₃）₃ ·5H ₂ O和的GeO₂和随后的转化为烧绿石相，在683（23）°C和3.89（3）GPa下观察到。通过采用适当的化学计量的前体来降低高压相的形成温度也可能在固态化学的更广泛领域中得到应用。

更新日期：2017-11-15

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