Formation mechanism of calcium aluminate compounds based on high-temperature solid-state reaction

Structure Property Relationships and Cationic Doping in [Ca24Al28O64]4+ Framework: A Review

“…C12A7 is an intermediate compound in the CaO and Al 2 O 3 binary system sandwiched between the two-phase regions consisting of C12A7 and either secondary phases denoted CA (CaAl 2 O 3 ) and C3A (Ca 3 Al 2 O 6 ) ( Figure 5). These two secondary phases are the formation products of C12A7 at higher temperatures (≥1200 • C), normally through solid-state synthesis, and decomposition products when no anions are present to stabilize the cage framework at high temperatures [63,64].…”

“…It is suspected that the formation reaction proceeds through a secondary phase which is metastable, C5A3 (Ca Al O ) [63,64,66]. There is a small stoichiometric difference between the C12A7 and C5A3, 9 Ca Al O + Ca Al O → 2 [Ca Al O ] : 2O .…”

Physical, mechanical properties and antimicrobial analysis of a novel CaO·Al2O3 compound reinforced with Al or Ag particles

“…Also, this material has been studied for biomedical applications (Regina de Oliveira et al, 2015), such as in odontology (Leal Silva et al, 2014;Engqvist et al, 2004;Parreira et al, 2016;Loof et al, 2003;Oliveira et al, 2010;Andrade et al, 2014), bone replacement (Uchida et al, 1984) and bone-graft applications (Kalita et al, 2002;Hulbert et al, 1970). As well, calcium aluminate has been the focus of several studies about of the synthesis processes, such as the sol-gel method (Aitasalo et al, 2002), solid state reaction (Miranda Hernández et al, 2018;Aitasalo et al, 2002;Yongpan et al, 2016), sintering (Miranda Hernández et al, 2018;Iftekhar et al, 2008;, mechanochemical synthesis (Wieczorek-Ciurowa et al, 2010), and the sonochemical process (Lourençoa et al, 2013). Calcium aluminate is synthesized principally from the CaO and Al 2 O 3 (Andrade et al, 2014;Yongpan et al, 2016;Iftekhar et al, 2008;Wieczorek-Ciurowa et al, 2010;Lourençoa et al, 2013;Zawrah and Khalil, 2007), but in some cases, the CaO is obtained through the thermic effect from CaCO 3 (Miranda Hernández et al, 2018;Andrade et al, 2014;Iftekhar et al, 2008;Galan et al, 2013).…”

“…As well, calcium aluminate has been the focus of several studies about of the synthesis processes, such as the sol-gel method (Aitasalo et al, 2002), solid state reaction (Miranda Hernández et al, 2018;Aitasalo et al, 2002;Yongpan et al, 2016), sintering (Miranda Hernández et al, 2018;Iftekhar et al, 2008;, mechanochemical synthesis (Wieczorek-Ciurowa et al, 2010), and the sonochemical process (Lourençoa et al, 2013). Calcium aluminate is synthesized principally from the CaO and Al 2 O 3 (Andrade et al, 2014;Yongpan et al, 2016;Iftekhar et al, 2008;Wieczorek-Ciurowa et al, 2010;Lourençoa et al, 2013;Zawrah and Khalil, 2007), but in some cases, the CaO is obtained through the thermic effect from CaCO 3 (Miranda Hernández et al, 2018;Andrade et al, 2014;Iftekhar et al, 2008;Galan et al, 2013). Also, CaCO 3 can be obtained from natural sources such as snail shells, egg shells or clam shells (Miranda Hernández et al, 2018;Singh and https://doi.org/10.1016/j.jmbbm.2019.05.041 Received 18 January 2019; Accepted 27 May 2019 Purohit, 2010;Viriya et al, 1016;Ligaszewski et al, 2009;White et al, 2007;Marxen et al, 2003;Niju et al, 2016).…”

Synthesis and Characterization of (Ca1−xSrx)12Al14O33 Electrides

“…[15] Up to date, the high-temperature solid DOI: 10.1002/crat.201700201 phase reaction method is one of the main methods for preparing C12A7, although this method is time consuming (above 10 hours). [16][17][18] Several measures were applied to synthesize C12A7 electrides, for instance, Ca metal-vapor treatment at 700°C for 240 hours, [19] thermal treatment in Ti metal-vapor, [20] and thermal treatment in a reducing atmosphere. [21] Among them, Ti metal reduction method is the most effective one to achieve high electron concentration in C12A7 electrides.…”