Standard enthalpies of formation determination of lanthanum fluorbritholites

Kaouther Ardhaoui

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Standard enthalpies of formation determination of lanthanum fluorbritholites

机译：标准焓荧光铜岩形成测定的标准焓

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摘要

Lanthanum-enclosing silicate-fluorapatites or britholites Ca_(10-x)La_x (PO_4)_(6-x) (SiO_4)_x F_2 with 1 ≤ x ≤ 6, were obtained by solid state reaction at high temperature and characterized by X-ray diffraction and IR spectroscopy. The enthalpies of solution were measured in nitric acidic solution at 298.15 K using a swinging differential Tian-Calvet calorimeter. The determination of the formation enthalpies from the elements, were performed handling a thermochemical cycle and complementary experiments. In the studied solid solution the stability decreases with the rate of substitution.

机译：用1≤x≤6的镧封闭硅酸盐 - 氟磷酸盐或硅酸盐CA_（10-x）La_x（PO_4）_（6-x）（SiO_4）（SiO_4）通过高温的固态反应获得，并以X-为特征射线衍射和红外光谱。在298.15k使用摆动差动天 - 肉排量热计，在硝酸溶液中测量溶液的焓。从元素中测定形成的形成焓，处理热化学循环和互补实验。在研究的固溶下，稳定性随着替代速率而降低。

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来源
《Materials Science and Engineering》 |2020年第11期|114661.1-114661.5|共5页
作者
Kaouther Ardhaoui;
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作者单位

Laboratory of Eremology and Combating Desertification LR16IRA01 IRA Medenine Tunisia Higher Institute of Applied Biology of Medenine Gabes University Tunisia;

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正文语种 eng
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关键词
Britholites; Heat of solution; Heat of formation; Mixing enthalpy;

机译：钎焊;溶液热量;形成热量;混合焓;

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4. Study on Determination of Standard Molar Enthalpy of Formation for Complex of Europium Chloride with Glycine and Alanine by Calorimetry [C] . Bin Deng, Haiying Huang, Qiangguo Li International Conference on Advances in Energy, Environment and Chemical Engineering . 2015

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6. Random forests for feature selection in QSPR Models - an application for predicting standard enthalpy of formation of hydrocarbons [O] . Ana L Teixeira, João P Leal, Andre O Falcao 2013

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7. Thermochemistry of uranium compounds: XVI, Calorimetric determination of the standard molar enthalpy of formation at 298.15 K, low-temperature heat capacity, and high-temperature enthalpy increments of UO{sub 2}(OH){sub 2} {center_dot} H{sub 2}O (schoepite) [O] . Tasker, I. R., O`Hare, P. A. G., Lewis, B. M., 1987

机译：铀化合物的热化学：XVI，量热法测定298.15 K的标准摩尔生成焓，低温热容和UO的高温焓增量{sub 2}（OH）{sub 2} {center_dot} H { sub 2} O（schoepite）
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机译：铀化合物的热化学：XVI，量热法测定298.15 K的标准摩尔生成焓，低温热容和UO sub 2（OH）sub 2 /中心DOT / H sub 2 O的高温焓增量（ schoepite

Standard enthalpies of formation determination of lanthanum fluorbritholites

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