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

Helen Y. Playford; Craig L. Bull; Matthew G. Tucker; Nicholas P. Funnell; Christopher J. Ridley; Kenneth P. Marshall; Richard I. Walton

doi:10.1039/c7dt03370b

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

Helen Y. Playford, Craig L. Bull, Matthew G. Tucker, Nicholas P. Funnell, Christopher J. Ridley, Kenneth P. Marshall, Richard I. Walton

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Abstract

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.

Original language	English
Pages (from-to)	15415-15423
Number of pages	9
Journal	Dalton Transactions
Volume	46
Issue number	44
DOIs	https://doi.org/10.1039/c7dt03370b
State	Published - 2017
Externally published	Yes

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title = "In situ neutron diffraction study of the formation of Ho2Ge2O7 pyrochlore at high temperature and pressure",

abstract = "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.",

author = "Playford, {Helen Y.} and Bull, {Craig L.} and Tucker, {Matthew G.} and Funnell, {Nicholas P.} and Ridley, {Christopher J.} and Marshall, {Kenneth P.} and Walton, {Richard I.}",

note = "Publisher Copyright: {\textcopyright} 2017 The Royal Society of Chemistry.",

year = "2017",

doi = "10.1039/c7dt03370b",

language = "English",

volume = "46",

pages = "15415--15423",

journal = "Dalton Transactions",

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publisher = "Royal Society of Chemistry",

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TY - JOUR

T1 - In situ neutron diffraction study of the formation of Ho2Ge2O7 pyrochlore at high temperature and pressure

AU - Playford, Helen Y.

AU - Bull, Craig L.

AU - Tucker, Matthew G.

AU - Funnell, Nicholas P.

AU - Ridley, Christopher J.

AU - Marshall, Kenneth P.

AU - Walton, Richard I.

PY - 2017

Y1 - 2017

N2 - 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.

AB - 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.

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U2 - 10.1039/c7dt03370b

DO - 10.1039/c7dt03370b

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AN - SCOPUS:85034250813

SN - 1477-9226

VL - 46

SP - 15415

EP - 15423

JO - Dalton Transactions

JF - Dalton Transactions

IS - 44

ER -

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

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