白硼钙石的合成新方法及其热化学研究(英文)  

New Synthetic Method and Thermochemistry of 4CaO·5B_2O_3·7H_2O

作　　者：左传凤[1] 刘志宏[1] 杨荣榛[1] 胡满成[1] 

机构地区：[1]陕西师范大学化学与材料科学学院,西安710062

出　　处：《无机化学学报》2004年第8期964-966,共3页Chinese Journal of Inorganic Chemistry

基　　金：陕西省自然科学基金资助项目(No.2002B13)。

摘　　要：A pure calcium borate mineral,4CaO·5B 2 O 3 ·7H 2 O,was synthesized by phase transformation of double salt under hydrothermal condition and characterized by XRD,IR and chemical analysis.The molar enthalpy of solu - tion for4CaO·5B 2 O 3 ·7H 2 O in approximately1mol·L -1 HCl was determined.The standard molar enthalpy of for - mation-(11658.74 ± 8.93)kJ·mol -1 for4CaO·5B 2 O 3 ·7H 2 O was obtained from this result,measured enthalpies of solution of H 3 BO 3 in1mol·L -1 HCl(aq.),of CaO in(HCl+H 3 BO 3 )aqueous solution,and the standard molar en- thalpies of formation of CaO(s),H 3 BO 3 (s)and H 2 O(l).A pure calcium borate mineral,4CaO·5B 2 O 3 ·7H 2 O,was synthesized by phase transformation of double salt under hydrothermal condition and characterized by XRD,IR and chemical analysis.The molar enthalpy of solu - tion for4CaO·5B 2 O 3 ·7H 2 O in approximately1mol·L -1 HCl was determined.The standard molar enthalpy of for - mation-(11658.74 ± 8.93)kJ·mol -1 for4CaO·5B 2 O 3 ·7H 2 O was obtained from this result,measured enthalpies of solution of H 3 BO 3 in1mol·L -1 HCl(aq.),of CaO in(HCl+H 3 BO 3 )aqueous solution,and the standard molar en- thalpies of formation of CaO(s),H 3 BO 3 (s)and H 2 O(l).

关 键 词：白硼钙石 合成方法 热化学 标准摩尔生成焓 

分 类 号：O614.231[理学—无机化学] O613.81[理学—化学]