“…Wang et al (2018bWang et al ( , 2019a) reported a novel dielectric GRIN lens based on the cold sintering of NBMO-xLMO and BLVMO-xNMO systems. Moreover CSP has attracted a lot of research interest in a wide range of areas especially in the field of semiconductors, ionic conductors, piezoelectric ceramics, Li ion batteries, nano composites, thermo electrics and low dielectric loss ceramics (Berbano et al, 2017;Funahashi et al, 2017a;Seo et al, 2017;Charoonsuk et al, 2018;Gonzalez-Julian et al, 2018;Induja and Sebastian, 2018;Leng et al, 2018;Ndayishimiye et al, 2018a,b;Wang et al, 2018a;Sibi et al, 2020). Induja and Sebastian (2018) reported that Al 2 SiO 5 ceramics can be easily densified using CSP with the aid of NaCl as water soluble additive.…”