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Measurement of the Electrical Conductivity of zircon at High ...

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The value <strong>of</strong> <strong>the</strong> electrical conductivity <strong>at</strong> 2500°C estim<strong>at</strong>ed with <strong>the</strong> ANSYS<br />

modelling, is σ = 70 1/(Ω⋅m).<br />

For <strong>the</strong> calcul<strong>at</strong>ion we used <strong>the</strong> following d<strong>at</strong>a:<br />

resistance <strong>of</strong> <strong>the</strong> sample was 0.4 Ω, distance between<br />

electrode and <strong>the</strong> bottom <strong>of</strong> <strong>the</strong> crucible was 10 mm<br />

and <strong>the</strong> level <strong>of</strong> <strong>the</strong> m<strong>at</strong>erial in <strong>the</strong> crucible was 15<br />

mm. A second value which resulted from <strong>the</strong><br />

analytical calcul<strong>at</strong>ions is σ = 65 1/(Ω⋅m).<br />

Fig. 7. Our samples after different<br />

experiments.<br />

accordance with d<strong>at</strong>a from o<strong>the</strong>r sources.<br />

Conclusions<br />

1. It was shown th<strong>at</strong> such experiments can be<br />

made using standard experimental and measuring<br />

equipment.<br />

2. The experiment carried out th<strong>at</strong> <strong>the</strong> electrical<br />

conductivity depends on <strong>the</strong> temper<strong>at</strong>ure as<br />

k T<br />

~ e − E a<br />

σ .<br />

Tab. 3. Values <strong>of</strong> activ<strong>at</strong>ion energy<br />

Temper<strong>at</strong>ure,<br />

o C<br />

Activ<strong>at</strong>ion<br />

energy E a ,<br />

kcal/mol<br />

Activ<strong>at</strong>ion<br />

energy E a ,<br />

eV<br />

1100÷1700 5.5±0.6 0.24±0.03<br />

1700÷2400 52±5 2.2±0.2<br />

3. The dependence <strong>of</strong> <strong>the</strong> electrical conductivity<br />

<strong>of</strong> <strong>zircon</strong> (ZrSiO 4 ) on <strong>the</strong> temper<strong>at</strong>ure was carried<br />

out. The conductivity <strong>at</strong> a temper<strong>at</strong>ure <strong>of</strong> 2500°C<br />

was determined as σ = 70 1/(Ω⋅m). This value is in<br />

4. Values <strong>of</strong> <strong>the</strong> activ<strong>at</strong>ion energy were determined for two temper<strong>at</strong>ure intervals<br />

(different phase st<strong>at</strong>es (Tab. 3)).<br />

5. The experimental equipment and <strong>the</strong> ma<strong>the</strong>m<strong>at</strong>ical model can be used to analyse<br />

systems like this and to calcul<strong>at</strong>e <strong>the</strong> influence <strong>of</strong> different factors on <strong>the</strong> measurements.<br />

References<br />

[1] В. Д. Кинжери. Измерения при высоких температурах. Москва, 1963.<br />

[2] И. Э. Кэммбелл. Техника высоких температур. Издательство иностранной литературы, Москва,<br />

1959.<br />

[3] М. А. Маурах, Б. С. Митин. Жидкие тугоплавкие окислы. Металлургия, 1979.<br />

[4] А. С. Болгар, Ц. П. Гардиенко и др. Комплексное исследование теплофизических свойств твёрдых<br />

веществ. Теплофизические свойства твёрдых веществ, Наука, Москва, 1973.<br />

[5] А. Н. Кисель, В. П. Матвеева, В. Е. Финкельштейн. Специальные оптические пирометры для<br />

точных измерений высокой температуры веществ в конденсированной фазе при теплофизических<br />

исследованиях. Теплофизические свойства твёрдых веществ, Наука, Москва, 1973.<br />

[6] Н. А. Торопов, В. П. Барзаковский и др. Диаграммы состояния силикатных систем. Справочник.<br />

Наука, Москва-Ленинград, 1965.<br />

[7] С. Ф. Пальгуев, А. Д. Неуймин и др. Електропроводность высокоогнеупорных окислов при высокмх<br />

температурах. Силикаты и окислы в химии высоких температур. Москва, 1963.<br />

[8] The Intern<strong>at</strong>ional Temper<strong>at</strong>ure Scale <strong>of</strong> 1990. H. Preston-Thomas, www.omega.com<br />

140

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